;MODEMH is a version of MODEM7A, incorporating a facility to
;hand over control to a remote computer

;For details of the added facility see the file HMODEM.DOC

;This configuration is for a Datamax, using a Z80 SIO.	If
;reconfiguring, note that the added section at the end is
;written to be independent of the main program

;No baud initialisation - boot with a CPM preconfigured with SETUP.

;MODEM7A IS AN EXTENSIVE REVISION OF THE CP/M MODEM PROGRAM
;CREATED BY WARD CHRISTENSEN FOR THE CP/M USERS LIBRARY.

;THE ADDITIONAL ROUTINES ARE COPYRIGHTED (1980) BY:

;Mark M. Zeiger		and	James K. Mills
;198-01B 67th Ave.		824 Jordan Place
;Flushing, N.Y. 11365		Rockford, IL  61108
;(212) 454-6985			(815) 398-0579

;Permission is granted to use, but not to sell, these routines.

;LAST REVISION 31/Jan/82	Set up for Interfacer 
;LAST REVISION 12/18/80		Changed disconnect timing

;This MODEMH augmentation is by Charles Hamblin, 6 Jan 1983

	MACLIB MODEM7	;CONTAINS CMDLINE, INBUF, INLNCOMP,
			;DIR, AND MFACCESS ROUTINES
			;changed to MODEM.LIB by Jim Mills
			;to differentiate from other 'MACROS.LIB'

TRUE	EQU	0FFH
FALSE	EQU	0

PORT	EQU	6	;Datamax aux. MODEM PORT BASE

MODCTLP EQU	PORT+1		;MODEM STATUS PORT
MODSNDB EQU	1		;MODEM SEND BIT (XMIT BUFF EMPTY)
MODSNDR EQU	1		;MODEM SEND READY
MODRCVB EQU	2		;MODEM RECEIVE BIT (DAV)
MODRCVR EQU	2		;MODEM RECEIVE READY
MODDATP EQU	PORT		;MODEM DATA PORT
BAUDRP	EQU	0ah		;BAUD RATE PORT		---?
MODCTL2 EQU	0bh		;2ND MODEM CONTROL PORT ---?
ORIGMOD EQU	1DH		;ORIGINATE MODE
ANSWMOD EQU	1EH		;ANSWER MODE

ERRLIM	EQU	10		;NUMBER OF TIMES TO RETRY
				;SEND/RECEIVE ERRORS BEFORE QUIT
EXITCHR EQU	'E'-40H		; ^E = EXIT WITHOUT DISCONNECT
DISCCHR EQU	'D'-40H		; ^D = DISCONNECT
TRANCHR EQU	'T'-40H		; ^T = TRANSFER CHARACTER
CAN	EQU	'X'-40H		; ^X = CANCEL SEND/RECEIVE
EOFCHAR EQU	'Z'-40H		; ^Z = END OF FILE
SAVECHR EQU	'Y'-40H		; ^Y = SAVE CHARACTER
XOFF	EQU	'S'-40H		; ^S = XOFF CHARACTER
XON	EQU	'Q'-40H		; ^Q = XON CHARACTER
SOH	EQU	1		; START OF HEADER
EOT	EQU	4		; END OF TEXT
ACK	EQU	6		; ACKNOWLEDGE
NAK	EQU	15H		; NOT ACKNOWLEDGE
BDNMCH	EQU	75H		; BAD NAME MATCH
OKNMCH	EQU	ACK		; OKAY NAME MATCH
LF	EQU	10		; LINEFEED
CR	EQU	13		; CARRIAGE RETURN
BELL	EQU	7		; BELL CHARACTER
FRONTPAN EQU	0FFH		; IMSAI FRONT PANEL

;Added equates for handover routines
;For defines, see end of listing

haven equ 0c400h ;adjust to suit
eschar equ 1bh
mdatp equ moddatp
mstatp equ modctlp
base equ 0


;THESE ROUTINES ARE AT THE BEGINNING OF THE PROGRAM SO
;THEY CAN BE PATCHED BY A MONITER WITHOUT RE-ASSEMBLING
;THE PROGRAM.

nulno: db 4 ;no of nulls for delay between sectors during file transfer

 ;If the remote computer needs nulls after a linefeed, also set
 ;LFNULLS at the end of the listing

IMSAIBYTE	DB	FALSE		;true=imsai front panel
FASTCLK		DB	TRUE		;4 MHz or greater
BAKUPBYTE	DB	TRUE		;true=make .BAK file
XPRFLG		DB	FALSE		;true=no menu, false=print menu
OUT$MODDATP	OUT	MODDATP ! RET	;out modem data port
IN$MODDATP	IN	MODDATP ! RET	;in modem data port
JMP$INITMOD	JMP	INITMOD		;to initialize port, if necessary
IN$BAUDRP	IN	BAUDRP	! RET	;in baudrate port
OUT$BAUDRP	OUT	BAUDRP	! RET	;out baudrate port
OUT$MODCTL2	OUT	MODCTL2 ! RET	;out modem control port #2
;
recsta: call timwst
 xra a ;sr get modem receive status
 out modctlp
 in modctlp
 ani 1
 cpi 1
 ret

trasta: call timwst
 mvi a,10h ;sr get modem transmit status
 out modctlp
 in modctlp
 ani 0ch
 cpi 0ch
 ret

timwst: jmp timwst+3
 ret

START:
	LXI	H,0
	DAD	SP		;GET CP/M'S STACK
	SHLD	STACK		;SAVE IT
	LXI	SP,STACK	;START LOCAL STACK
	CALL	START1
	DB	CR,LF,'MODEMH as of 6 Jan 83',cr,lf
 DB 'Adapted by Charles Hamblin from the MODEM7 of Ward',cr,lf
 db 'Christensen, Mark M. Zeiger, Jim Mills, Bill Bolton',cr,lf,'$'
;
bottram dw 0		;will calculate
;
START1:
	POP	D		;GET ADDRESS OF ABOVE MESSAGE
	MVI	C,PRINT		; 9
	CALL	BDOS
	lxi	h,last+100h
	mvi	l,0
	shld	bottram		;calc rplaces orig def
	CALL	INITADR		;INITIALIZE ADDRESSES
	MVI	A,TRUE		; 0FFH
	STA	NFILFLG
	CMA			; 0
	STA	SAVEFLG
	CALL	PROCOPT		;PROCESS CONTROL OPTIONS
	LDA	OPTION		;GET MAIN OPTION
	CPI	'X'		;EXPERT FLAG?
	JNZ	RESTART		;NO
	MVI	A,TRUE		;YES
	STA	XPRFLG		;MAKE EXPERT
	JMP	MENU
;
RESTART:
	LDA	OPTION		;GET MAIN	OPTION
S1:
	CPI	' '		;NO OPTION SPEC'D?
	JZ	MENU		;TRUE, GO MENU
	CPI	'M'		;MENU ASKED FOR?
	JZ	MENU		;YES, GO MENU
	CALL	JMP$INITMOD
	CALL	MOVEFCB
	MVI	A,FALSE
	STA	NFILFLG
	CALL	IN$MODDATP	;GOBBLE UP GARBAGE..
	CALL	IN$MODDATP	;..CHARACTERS ON LINE
	LDA	OPTION		;PROCESS MAIN	OPTION
	CPI	'E'		;ECHO MODE?
	JZ	hechek	;YES	(will disallow when handover)
	CPI	'T'		;TERMINAL MODE?
	JZ	DSKSAVE		;YES
	CPI	'S'		;SEND A FILE?
	JZ	SENDFIL		;YES
	CPI	'R'		;RECEIVE A FILE?
	JZ	RCVFIL		;YES
	CPI	'D'		;DISCONNECT?
	JZ	DISCON1		;YES, DISCONNECT & GO MENU
 cpi 'H'
 jz rgiv		;handover option
	JMP	MENU		;NO OPTION SPEC'D, GO MENU
;
;REVISED TERMINAL ROUTINE ALLOWING MEMORY SAVE
;
DSKSAVE:
	LDA	NFILFLG		;NEW FILE FLAG
	CPI	TRUE		;OFFH? (TRUE=NORMAL TERMINAL MODE)
	JZ	TERM		;YES
	LDA	FCB+1		;FIRST CHAR OF FILENAME
	CPI	' '		;FILE SPEC'D
	JNZ	GOODNM		;YES, GOOD NAME
	MVI	A,TRUE		;0FFH
	STA	NFILFLG
	CMA			; 0
	STA	SAVEFLG
	JMP	TERM

GOODNM:
	CALL	ERASFIL
	CALL	MOVE2
	LXI	D,FCB3
	MVI	C,MAKE
	CALL	BDOS
	LXI	D,FCB3
	MVI	C,OPEN
	CALL	BDOS
	lhld	BOTTRAM
	SHLD	HLSAVE
	MVI	A,FALSE
	STA	NFILFLG
TERM:
	CALL	STAT		;KEYPRESS?
	JZ	TERM2		;NO, CHECK LINE
	CALL	KEYIN		;GET CHAR FROM KBD
	CPI	EXITCHR		;^E?
	JZ	MENU		;YES, RETURN TO MENU
	CPI	DISCCHR		;^D?
	JZ	DISCON1		;YES, DISCONNECT & RETURN TO MENU
	CPI	TRANCHR		;TEST FOR TRANSFER REQUEST (^T)
	CZ	TRANSFER	;SEND-A-FILE (BLIND SEND)
	JZ	TERM		;LOOP
	CPI	SAVECHR
	JNZ	NOTOG
	LDA	NFILFLG		;DO NOT ALLOW SAVE IF..
	CPI	TRUE		;..THIS FLAG IS SET.
	JZ	TERM2
	LDA	SAVEFLG
	CMA
	STA	SAVEFLG
term2: call qhando
 jz term
	JMP	TERML
;
NOTOG:
 call qhando ;gives z if handed over
 jz terml2
	CALL	OUT$MODDATP
TERML:
	CALL	recsta
	JNZ	TERM
	CALL	IN$MODDATP
	CPI	0		;CHECK FOR NULLS
	JZ	TERM		;DON'T PROCESS THEM
	ANI	7FH		;STRIP PARITY
terml2: CALL	TYPE
	PUSH	PSW
	LDA	SAVEFLG
	CPI	FALSE
	JZ	NOSAVE
	POP	PSW
	MOV	M,A
	INX	H
	SHLD	HLSAVE		;MENU COMMAND DESTROYS HL-REG..
				;..GET HL WHEN ENTERING VIA 'RET' CMD.
	MOV	B,A
	LDA	IMSAIBYTE
	ORA	A
	MOV	A,B
	JZ	COLON
	CMA			;FRONT PANEL SHOWS CHARS WHEN..(deleted)
	JMP	NOCOLON
;
COLON:
	CPI	LF		;IF NO FRONT PANEL, THEN..
	JNZ	NOCOLON		;..TYPE ":" AFTER EACH LINE FEED..
	MVI	A,':'		;..WHEN MEMORY SAVE ACTIVE.
	CALL	TYPE
NOCOLON:
	LDA	7		;CHECK TO SEE IF..
	DCR	A		;..PAGE BELOW BDOS HAS BEEN..
	CMP	H		;..REACHED AND DISKSAVE IS NEEDED.
	CZ	INTDSKSV
	JMP	TERM
;
NOSAVE:
	POP	PSW
	JMP	TERM

SAVEFLG	 DB	FALSE
LASTBYT1 DB	0
LASTBYT2 DB	0

INTDSKSV:
	MVI	A,XOFF		;SEND A CTRL-S TO STOP..
	CALL	OUT$MODDATP	;..REMOTE COMPUTER OUTPUT.
	MVI	D,0		;D IS THE BUFFER COUNT
	CALL	INMODEM		;GET LAST BYTES SENT..
	STA	LASTBYT1	;..AFTER CTRL-S.
	CALL	INMODEM		;ADD MORE CALLS TO INMODEM..
	STA	LASTBYT2	;..AND STA	LASTBYT# IF YOU ARE..
				;..LOSING BYTES WHEN MEMORY IS FULL.
	PUSH	D
	CALL	NUMREC1
	CALL	WRTDSK		;WRITE THE RECORDS
	POP	D
	lhld	BOTTRAM
	INR	D
	DCR	D		;TEST BUFFER COUNT FOR ZERO
	JZ	CTRLQ
	LDA	LASTBYT1	;GET THE LAST BYTES THAT WERE..
	MOV	M,A		;..SAVED AND PUT THEM IN..
	INX	H		;..BOTTRAM.
	CALL	TYPE
	DCR	D
	JZ	CTRLQ
	LDA	LASTBYT2
	MOV	M,A
	INX	H
	CALL	TYPE
CTRLQ:
	MVI	A,XON		;SEND START CHARACTER..
	CALL	OUT$MODDATP	;..TO REMOTE COMPUTER.
	RET
;
;THIS SUBROUTINE WILL LOOP UNTIL THE MODEM RECEIVES A CHARACTER
;OR 100 MILLISECONDS. IF A CHARACTER IS RECEIVED, A FLAG IS SET
;TO STORE THE CHARACTER. A MAXIMUM OF TWO CHARACTERS ARE STORED,
;BUT MORE MAY BE STORED IF DESIRED (SEE COMMENT IN	"INTDSKSV"
;ABOVE).

INMODEM:
	LDA	FASTCLK
	ORA	A
	JZ	SLOW
	LXI	B,2500
	JMP	TIMERL
SLOW:
	LXI	B,1250
TIMERL:
	CALL	recsta
	JZ	GETBYTE
	DCX	B
	MOV	A,B
	ORA	C
	JNZ	TIMERL
	RET
;
GETBYTE:
	CALL	IN$MODDATP
	INR	D
	RET
;
NUMRECS:
	MVI	M,EOFCHAR
	INX	H
	LXI	D,127
	DAD D
NUMREC1:
	xchg
	lhld	bottram
	mov	a,l
	cma
	mov	l,a
	mov	a,h
	cma
	mov	h,a
	inx	h
	xchg
	DAD D
	MOV	A,L		;DIVIDE HL BY 128..
	ORA	A
	RAL			;..TO GET THE..
	MOV	L,H		;..NUMBER OF SECTORS
	MVI	H,0
	PUSH	PSW
	DAD H
	POP	PSW
	MVI	A,0
	ADC L
	MOV	L,A		;RETURNS WITH NUMBER OF..
	RET			;..128 BYTE RECORDS IN	HL.
;
WRTDSK:
	xchg
	lhld	bottram
	xchg
NEXTWRT:
	MVI	C,STDMA
	CALL	BDOSRT
	PUSH	D
	LXI	D,FCB3
	MVI	C,WRITE
	CALL	BDOSRT
	POP	D
	XCHG
	PUSH	D
	LXI	D,128
	DAD D
	POP	D
	XCHG
	DCX	H
	MOV	A,H
	ORA	L
	JNZ	NEXTWRT
	RET
;
CLOSE3:
	LXI	D,FCB3
	MVI	C,CLOSE
	CALL	BDOS
	RET
;
BDOSRT	PUSH	B
	PUSH	D
	PUSH	H
	PUSH	PSW
	CALL	BDOS
	POP	PSW
	POP	H
	POP	D
	POP	B
	RET
;
MOVE2:
	LXI	H,FCB3
	CALL	INITFCBS
	LXI	H,FCB
	LXI	D,FCB3
	MVI	B,12
	CALL	MOVE
	RET
;
;FILE TRANSFER ROUTINE - CALLED WITH 
;CONTROL-T FROM TERMINAL ROUTINE.
;TRANSFER MAY BE CANCELLED WHILE SENDING BY USING CONTROL-X.

TRANSFER
	PUSH	H
	PUSH	D
	PUSH	B
	PUSH	PSW
	LXI	H,FCB4
	CALL	INITFCBS	;INITIALIZES FCBS POINTED..
	LXI	H,FCB+16	;..TO BY HL REG.
	CALL	INITFCBS
GET:
	CALL	GETNAME
	LDA	CMDBUF+2	;WAS FILE ENTERED
	CPI	20H
	JZ	TRANSL2
	CALL	MOVE4
	CALL	OPEN4
	CPI	0FFH		;RETURN WITH 0FFH MEANS
	JNZ	CONTIN		;FILE DOES NOT EXIST
TRANSL1:
	CALL	ILPRT
	DB	CR,LF,'++FILE DOES NOT EXIST++',CR,LF,0
;
TRANSL2:
	CALL	ILPRT
	DB	'TYPE "R" TO RETURN TO MODEM',CR,LF
	DB	'TYPE "A" TO RE-ENTER NAME: ',BELL,0
;
	CALL	KEYIN
	CALL	UCASE
	CALL	TYPE		;ECHO RESPONSE
	CALL	CRLF
	CPI	'A'
	JZ	GET
	CPI	'R'
	JZ	RETURN
	JMP	TRANSL2
;
CONTIN:
	LXI	D,80H
	MVI	C,STDMA
	CALL	BDOS
READMR:
	CALL	READ80
	CPI	1		;END OF FILE
	JZ	RETURNS
	CPI	2		;BAD READ
	JZ	RETURNU
	CALL	SEND80C
	CPI	EOFCHAR		;END OF FILE - OMIT IF OBJECT..
	JZ	RETURNS		;..CODE IS TO BE SENT.
	CPI	CAN		;CANCELLATION?
	JZ	TRANCAN
	JMP	READMR
;
RETURNS:
	CALL	ILPRT
	DB	CR,LF,'++FILE TRANSFER COMPLETED++',CR,LF,BELL,0
;
	JMP	RETURN
;
RETURNU:
	CALL	ILPRT
	DB	CR,LF,'++FILE TRANSFER UNSUCCESSFUL++',CR,LF,BELL,0
;
	JMP	RETURN
;
TRANCAN:
	CALL	ILPRT
	DB	CR,LF,CR,LF,'++ TRANSFER CANCELLED ++',CR,LF,BELL,0
;
RETURN;
	POP	PSW
	POP	B
	POP	D
	POP	H
	RET
;
INITFCBS:			;ENTRY AT +2 WILL LEAVE..
	MVI	M,0		;..DRIVE NO. INTACT.
	INX	H		;WILL INITIALIZE AN FCB..
	MVI	B,11		;..POINTED TO BY HL-REG. FILLS 1ST POS
LOOP10:
	MVI	M,' '		;..WITH 0, NEXT 11 WITH..
	INX	H		;..WITH BLANKS, AND LAST..
	DCR	B		;..21 WITH NULLS.
	JNZ	LOOP10
	MVI	B,21
LOOP11:
	MVI	M,0
	INX	H
	DCR	B
	JNZ	LOOP11
	RET
;
GETNAME:
	CALL	ILPRT
	DB	CR,LF,'ENTER FILE NAME TO BE TRANSFERRED -  C/R TO QUIT: ',0
;
	LXI	D,CMDBUF
	CALL	INBUFF
	CALL	CRLF
	RET
;
MOVE4:
	LXI	D,CMDBUF
	LXI	H,FCB4
	CALL	CPMLINE
	RET
;
OPEN4:
	LXI	D,FCB4
	MVI	C,OPEN
	CALL	BDOS
	RET
;
READ80:
	LXI	D,FCB4
	MVI	C,READ
	CALL	BDOS
	RET
;
SEND80C:
	MVI	B,80H
	LXI	H,80H
SENDCH1:
	MOV	A,M
	CALL	MODOUT
	CPI	EOFCHAR
	RZ
	CALL	STAT		;TEST TO SEE IF
	ORA	A		;CANCELLATION REQUESTED
	JZ	SKIP12
	CALL	KEYIN
	CPI	CAN
	RZ
SKIP12:
	INX	H
	DCR	B
	JNZ	SENDCH1
	RET
;
MODOUT:
	PUSH	PSW
MODOUTL:
	CALL	trasta
	JNZ	MODOUTL
	POP	PSW
	CALL	OUT$MODDATP
	CALL	TYPE
	RET
;
FCB4:	DS	 33

;TERMINAL ECHO MODE

hechek: call qhando ;rets z if handed over
 jz menu ;echo mode disallowed

TRMECHO:
	CALL	recsta
	JZ	LINECHR
	CALL	STAT
	JZ	TRMECHO
	CALL	KEYIN
	CPI	EXITCHR
	JZ	MENU
	CALL	OUT$MODDATP
	CALL	TYPE
	JMP	TRMECHO
;
LINECHR:
	CALL	IN$MODDATP
	CALL	OUT$MODDATP
	CALL	TYPE
	JMP	TRMECHO
;
;UNCOMMENTED LINES ARE THOSE OF ORIGINAL MODEM PROGRAM.
;COMMENTS DENOTE ADDITIONS.
;
;		SEND A CP/M FILE

SENDFIL:
	LDA	BATCHFLG	;CHECK IF MULTIPLE FILE..
	ORA	A		;..MODE IS SET.
	JNZ	SENDC1
	MVI	A,TRUE		;INDICATE BATCH SEND
	STA	SENDFLG
	LDA	FSTFLG		;IF FIRST TIME THRU..
	ORA	A		;..SCAN THE COMMAND LINE..
	CNZ	TNMBUF		;..FOR MULTIPLE NAMES.
	CALL	SENDFN		;SENDS FILE NAME TO RECEIVER
	JNC	SENDC2		;CARRY SET MEANS NO MORE FILES.
	MVI	A,'B'		;STOP BATCH..
	STA	BATCHFLG	;..MODE OPTION.
	MVI	A,EOT		;FINAL XFER END
	CALL	SEND
	JMP	DONE
;
SENDC1:
	LDA	FCB+1
	CPI	' '
	JZ	BLKFILE
SENDC2:
	CALL	OPENFIL
	MVI	E,80
	CALL	WAITNAK
 xra a ;no echo in handover mode
 sta echfl+haven-rcan

SENDLP:
	CALL	RDSECT
	JC	SENDEOF
	CALL	INCRSNO
	XRA A
	STA	ERRCT
SENDRPT:
	CALL	SENDHDR
	CALL	SENDSEC
	CALL	SENDCKS
	CALL	GETACK
	JC	SENDRPT
	JMP	SENDLP
;
SENDEOF:
 call nulsend
	MVI	A,EOT
	CALL	SEND
	CALL	GETACK
	JC	SENDEOF
	JMP	DONE
;
;		RECEIVE A FILE

RCVFIL:
	LDA	BATCHFLG	;CHECK IF MULT..
	ORA	A		;..FILE MODE.
	JNZ	RCVC1
	MVI	A,FALSE		;FLAG WHERE TO RETURN..
	STA	SENDFLG		;..FOR NEXT FILE TRANS.
	CALL	GETFN		;GET THE FILE NAME.
	JNC	RCVC2		;CARRY SET MEANS NO MORE FILES.
	MVI	A,'B'		;STOP BATCH..
	STA	BATCHFLG	;..MODE OPTION.
	JMP	DONE
;
RCVC1:
	LDA	FCB+1		;MAKE SURE FILE IS NAMED
	CPI	' '
	JZ	BLKFILE
	JMP	RCVC3
;
RCVC2:
	CALL	CKCPM2
	CALL	CKBAKUP
RCVC3;
	CALL	ERASFIL
	CALL	MAKEFIL
	LDA	QFLG
	ORA	A
	JNZ	RCVLP
	LDA	BATCHFLG
	ORA	A		;DON'T PRINT MSSG IF..
	JZ	RCVLP		;..IN	MULTI AND QUIET.
	CALL	ILPRT
	DB	'FILE OPEN, READY TO RECEIVE',CR,LF,0
;
RCVLP:
	CALL	RCVSECT
	JC	RCVEOT
	CALL	WRSECT
	CALL	INCRSNO
	CALL	SENDACK
	JMP	RCVLP
;
RCVEOT:
	CALL	WRBLOCK
	CALL	SENDACK
	CALL	CLOSFIL
	JMP	DONE
;	
;SUBROUTINES

SENDFN:
	LDA	QFLG
	ORA	A
	JZ	SWNAK
	CALL	ILPRT
	DB	'AWAITING NAME NAK',CR,LF,0
;
SWNAK:
	MVI	E,80
	CALL	WAITNLP
	MVI	A,ACK		;GOT NAK, SEND ACK
	CALL	SEND
	LXI	H,FILECT
	DCR	M
	JM	NOMRNM
	LHLD	NBSAVE		;GET FILE NAME..
	LXI	D,FCB		;..IN	FCB
	MVI	B,12
	CALL	MOVE
	SHLD	NBSAVE
	CALL	SENDNM		;SEND IT
	ORA	A		;CLEAR CARRY
	RET
;
NOMRNM:
	MVI	A,EOT
	CALL	SEND
	STC
	RET
;
SENDNM:
	PUSH	H
SENDNM1:
	MVI	D,11		;COUNT CHARS IN NAME
	MVI	C,0		;INIT CHECKSUM
	LXI	H,FCB+1		;ADDRESS NAME
NAMLPS:
	MOV	A,M		;SEND NAME
	ANI	7FH		;STRIP HIGH ORDER BIT SO CP/M 2..
	CALL	SEND		;..WON'T SEND R/O FILE DESIGNATION.
	LDA	QFLG		;SHOW NAME IF..
	ORA	A		;..QFLG NOT SET.
	MOV	A,M
	CNZ	TYPE
ACKLP:
	PUSH	B		;SAVE CKSUM
	MVI	B,1		;WAIT FOR RECEIVER..
	CALL	RECV		;..TO ACKNOWLEDGE..
	POP	B		;..GETTING LETTER.
	JC	SCKSER
	CPI	ACK
	JNZ	ACKLP
	INX	H		;NEXT CHAR
	DCR	D
	JNZ	NAMLPS
	MVI	A,EOFCHAR	;TELL RECEIVER END OF NAME
	CALL	SEND
	LDA	QFLG
	ORA	A
	CNZ	CRLF
	MOV	D,C		;SAVE CHECKSUM
	MVI	B,1
	CALL	RECV		;GET CHECKSUM..
	CMP	D		;..FROM RECEIVER.
	JZ	NAMEOK
SCKSER:
	MVI	A,BDNMCH	;BAD NAME-TELL RECEIVER
	CALL	SEND
	LDA	QFLG
	ORA	A
	JZ	SKCSER1
	CALL	ILPRT
	DB	'CHECKSUM ERROR',CR,LF,0
;
SKCSER1:
	MVI	E,80		;DO HANDSHAKING OVER
	CALL	WAITNLP		;DON'T PRINT "AWAITING NAK" MSG
	MVI	A,ACK
	CALL	SEND
	JMP	SENDNM1
;
NAMEOK:
	MVI	A,OKNMCH	;GOOD NAME-TELL RECEIVER
	CALL	SEND
	POP	H
	RET	
;
GETFN:
	LXI	H,FCB
	CALL	INITFCBS+2	;DOES NOT INITIALIZE DRIVE
	LDA	QFLG
	ORA	A
	JZ	GNAMELP
	CALL	ILPRT
	DB	'AWAITING FILE NAME',CR,LF,0
;
GNAMELP:
	CALL	HSNAK
	JC	GNAMELP
	CALL	GETNM		;GET THE NAME
	CPI	EOT		;IF EOT, THEN NO MORE FILES
	JZ	NOMRNMG
	ORA	A		;CLEAR CARRY
	RET
;
NOMRNMG:
	STC
	RET
;
GETNM:
	PUSH	H
GETNM1:
	MVI	C,0		;INIT CHECKSUM
	LXI	H,FCB+1
NAMELPG:
	MVI	B,5
	CALL	RECV		;GET CHAR
	JNC	GETNM3
	LDA	QFLG
	ORA	A
	JZ	GETNM2
	CALL	ILPRT
	DB	'TIME OUT       RECEIVING FILENAME',CR,LF,0
;
GETNM2:
	JMP	GCKSER
;
GETNM3:
	CPI	EOT		;IF EOT, THEN NO MORE FILES
	JZ	GNRET
	CPI	EOFCHAR		;GOT END OF NAME
	JZ	ENDNAME
	MOV	M,A		;PUT NAME IN	FCB
	LDA	QFLG		;TYPE IT IF NO QFLG
	ORA	A
	MOV	A,M
	CNZ	TYPE
	PUSH	B		;SAVE CKSUM
	MVI	A,ACK		;ACK GETTING LETTER
	CALL	SEND
	POP	B
	INX	H		;GET NEXT CHAR
	MOV	A,L		;DON'T LET NOISE...
	CPI	7FH		;..CAUSE OVERFLOW..
	JZ	GCKSER		;..INTO PROGRAM AREA.
	JMP	NAMELPG
;
ENDNAME:
	LDA	QFLG
	ORA	A
	CNZ	CRLF
	MOV	A,C		;SEND CHECKSUM
	CALL	SEND
	MVI	B,1
	CALL	RECV		;CHECKSUM GOOD?
	CPI	OKNMCH		;YES IF OKNMCH SENT..
	JZ	GNRET		;..ELSE DO OVER.
GCKSER:
	LXI	H,FCB		;CLEAR FCB (EXCEPT DRIVE)..
	CALL	INITFCBS+2	;..SINCE IT MIGHT BE DAMAGED..
	LDA	QFLG		;..BY TOO MANY CHARS.
	ORA	A
	JZ	GCKSER1
	CALL	ILPRT
	DB	'CHECKSUM ERROR',CR,LF,0
;
GCKSER1:
	CALL	HSNAK		;DO HANDSHAKING OVER
	JC	GCKSER1
	JMP	GETNM1
;
GNRET:
	POP	H
	RET
;
HSNAK:
	MVI	A,NAK		;SEND NAK UNTIL..
	CALL	SEND		;..RECEIVING ACK.
	CALL	CKABORT		;DON'T GET HUNG UP HERE
	MVI	B,2		;WAIT 2 SECONDS..
	CALL	RECV		;..IN	RECEIVE.
	CPI	CAN		;IF SENDER ABORTS..
	JZ	ABORT		;..DURING NAME TRANSFER.
	CPI	ACK		;IF NAK,RETURN WITH..
	RZ			;..CARRY CLEAR.
	STC
	RET
;
TNMBUF:
	MVI	A,FALSE		;CALL FROM SENDFIL ONLY ONCE.
	STA	FSTFLG
	STA	FILECT
	CALL	SCAN
	LXI	H,NAMEBUF
	SHLD	NBSAVE		;SAVE ADDR OF 1ST NAME
TNLP1:
	CALL	TRTOBUF
	LXI	H,FCB
	LXI	D,FCBBUF
	CALL	CPMLINE		;PARSE NAME TO CP/M FORMAT
TNLP2:
	CALL	MFNAME		;SEARCH FOR NAMES (* FORMAT)
	JC	NEXTNM
	LDA	FCB+10		;IF CP/M 2 $SYS FILE..
	ANI	80H		;..DON'T SEND
	JNZ	TNLP2
	LHLD	NBSAVE		;GET NAME
	LXI	D,FCB		;MOVE IT TO FCB
	XCHG
	MVI	B,12
	CALL	MOVE
	XCHG
	SHLD	NBSAVE		;ADDR OF NEXT NAME
	LXI	H,FILECT	;COUNT FILES FOUND
	INR	M
	JMP	TNLP2
;
NEXTNM:
	LXI	H,NAMECT	;COUNT NAMES FOUND
	DCR	M
	JNZ	TNLP1
	LXI	H,NAMEBUF	;SAVE START OF BUFFER
	SHLD	NBSAVE
	LDA	FILECT
	CPI	65		;NO MORE THAN 64 TRANSFERS
	RC
	MVI	A,64		;ONLY X'FER FIRST 64
	STA	FILECT
	RET
;
;SCANS CMDBUF COUNTING NAMES AND PUTTING DELIMITER (SPACE)
;AFTER LAST NAME

SCAN:
	PUSH	H
	LXI	H,NAMECT
	MVI	M,0
	LXI	H,CMDBUF+1	;FIND END OF CMD LINE..
	MOV	C,M		;..AND PUT SPACE THERE.
	MVI	B,0
	LXI	H,CMDBUF+2
	DAD B
	MVI	M,20H
	LXI	H,CMDBUF+1
	MOV	B,M
	INR	B
	INR	B
SCANLP1:
	INX	H
	DCR	B
	JZ	DNSCAN
	MOV	A,M
	CPI	20H
	JNZ	SCANLP1
SCANLP2:
	INX	H		;EAT EXTRA SPACES
	DCR	B
	JZ	DNSCAN
	MOV	A,M
	CPI	20H
	JZ	SCANLP2
	SHLD	BGNMS		;SAVE START OF NAMES IN CMDBUF
	INR	B
	DCX	H
SCANLP3:
	INX	H
	DCR	B
	JZ	DNSCAN
	MOV	A,M
	CPI	20H
	JNZ	SCANLP3
	LDA	NAMECT		;COUNTS NAMES
	INR	A
	STA	NAMECT
SCANLP4:
	INX	H		;EAT SPACES
	DCR	B
	JZ	DNSCAN
	MOV	A,M
	CPI	20H
	JZ	SCANLP4
	JMP	SCANLP3
;
DNSCAN:
	MVI	M,20H	;SPACE AFTER LAST CHAR
	POP	H
	RET
;
;PLACES NEXT NAME IN	BUFFER SO CPMLINE MAY PARSE IT

TRTOBUF:
	LHLD	BGNMS
	MVI	B,0
	LXI	D,FCBBUF+2
TBLP:
	MOV	A,M
	CPI	20H
	JZ	TRBFEND
	STAX D
	INX	H
	INX	D
	INR	B		;COUNT CHARS IN NAME
	JMP	TBLP
;
TRBFEND:
	INX	H
	MOV	A,M		;EAT EXTRA SPACES
	CPI	20H
	JZ	TRBFEND
	SHLD	BGNMS
	LXI	H,FCBBUF+1	;PUT # CHARS BEFORE NAME
	MOV	M,B
	RET
;
;IN CP/M V.2, IF FILE IS R/O OR SYS, IT IS CHANGED TO 'BAK'.

CKCPM2;
	MVI	C,12
	CALL	BDOS
	ORA	A		;RETURN 0 MEANS CP/M 1
	RZ
	MVI	C,STDMA
	LXI	D,80H
	CALL	BDOS
	MVI	C,SRCHF		;SEARCH FOR FILE
	LXI	D,FCB
	CALL	BDOS
	CPI	0FFH
	RZ
	ADD A
	ADD A			;MULT A-REG BY..
	ADD A
	ADD A			;..32 TO FIND..
	ADD A			;..NAME IN	DMA.
	LXI	H,80H
	ADD L
	MOV	L,A		;HL POINTS TO DIR NAME
	LXI	D,9
	DAD D			;POINT TO R/O ATTRIB BYTE
	MOV	A,M
	ANI	80H		;TEST MSB
	JNZ	MKCHG		;IF SET, MAKE CHANGE
	INX	H		;CHECK SYSTEM ATTRIB BYTE
	MOV	A,M
	ANI	80H
	RZ			;NOT $SYS OR $R/O
	DCX	H
MKCHG:
	LXI	D,-8
	DAD	D		;POINT HL TO FILENAME + 1
	LXI	D,FCB+1		;MOVE DIR NAME TO FCB..
	MVI	B,11		;..WITHOUT CHANGING DRIVE.
	CALL	MOVE
	LXI	H,FCB+9		;R/O ATTRIB
	MOV	A,M
	ANI	7FH		;STRIP R/O ATTRIB
	MOV	M,A
	INX	H		;SYS ATTRIB
	MOV	A,M
	ANI	7FH
	MOV	M,A
	LXI	D,FCB
	MVI	C,30		;SET NEW ATTRIBS IN DIR
	CALL	BDOS

;MAY BE CALLED BY CKBAKUP BELOW. ITS RETURN DONE HERE

PLANCHG:
	LXI	H,FCB		;CHANGE NAME TO TYPE "BAK"
	LXI	D,6CH
	MVI	B,9		;MOVE DRIVE AND NAME (NOT TYPE)
	CALL	MOVE
	LXI	H,75H		;START OF TYPE IN FCB2
	MVI	M,'B'
	INX	H
	MVI	M,'A'
	INX	H
	MVI	M,'K'
	LXI	D,6CH
	MVI	C,ERASE		;ERASE ANY PREV BACKUPS
	CALL	BDOS
	LXI	H,6CH		;FCB2 DR FIELD SHOULD..
	MVI	M,0		;..0 FOR RENAME.
	LXI	D,FCB
	MVI	C,23		;RENAME
	CALL	BDOS
	RET
;
CKBAKUP:
	LDA	BAKUPBYTE
	ORA	A
	RZ
	MVI	C,SRCHF
	LXI	D,FCB
	CALL	BDOS
	INR	A
	RZ			;FILE NOT FOUND
	JMP	PLANCHG		;IN "CKCPM2" - RET DONE THERE
;
;MULTI-FILE ACCESS SUBROUTINE FROM CP/M USER'S GROUP
;FIXED BY MARK ZEIGER 8/17/80
;CARRY IS SET IF NO MORE NAMES CAN BE FOUND

MFNAME:
	MFACCESS		;A MACRO IN	MACROS.LIB
;
RCVSECT:
	XRA A
	STA	ERRCT
RCVRPT:
	LDA	QFLG
	ORA	A
	JZ	RCVSQ
	CALL	ILPRT
	DB	'AWAITING #',0
	LDA	SECTNO
	INR	A
	CALL	HEXO
	CALL	CRLF
 xra a
 sta echfl+haven-rcan ;no echo after the first when handed over

RCVSQ:
	MVI	B,7		;10 IN	ORIG PROG
	CALL	RECV
	JC	RCVSTOT
	CPI	CAN		;CHECK FOR CANCEL..
	JZ	ABORT		;..REQUEST FROM SENDER.
	CPI	SOH
	JZ	RCVSOH
	ORA	A
	JZ	RCVSQ
	CPI	EOT
	STC
	RZ
	MOV	B,A
	LDA	VSEEFLG
	ORA	A
	JZ	RCVSEH
	LDA	QFLG
	ORA	A
	JZ	RCVSERR
RCVSEH:
	MOV	A,B
	CALL	HEXO
	CALL	ILPRT
	DB	'H RCD, NOT SOH',CR,LF,0
;
RCVSERR:
	MVI	B,1
	CALL	RECV
	JNC	RCVSERR
	MVI	A,NAK
	CALL	SEND
	LDA	ERRCT
	INR	A
	STA	ERRCT
	CPI	ERRLIM
	JC	RCVRPT
	LDA	VSEEFLG
	ORA	A
	JZ	RCVCKQ
	LDA	QFLG
	ORA	A
	JZ	RCVSABT
RCVCKQ:
	CALL	CKQUIT
	JZ	RCVSECT
RCVSABT:
	CALL	CLOSFIL
	CALL	ERXIT
	DB	'++     UNABLE TO RECEIVE BLOCK  --  ABORTING ++',CR,LF,'$'
;
RCVSTOT:
	LDA	VSEEFLG
	ORA	A
	JZ	RCVSPT
	LDA	QFLG
	ORA	A
	JZ	RCVSERR
RCVSPT:
	CALL	ILPRT
	DB	'++  TIMEOUT    ++ ',0
;
RCVPRN:
	LDA	ERRCT
	CALL	HEXO
	CALL	CRLF
	JMP	RCVSERR
;
RCVSOH:
	MVI	B,1
	CALL	RECV
	JC	RCVSTOT
	MOV	D,A
	MVI	B,1
	CALL	RECV
	JC	RCVSTOT
	CMA
	CMP	D
	JZ	RCVDATA
	LDA	VSEEFLG
	ORA	A
	JZ	RCVBSE
	LDA	QFLG
	ORA	A
	JZ	RCVSERR
RCVBSE:
	CALL	ILPRT
	DB	'++  BAD SECTOR # IN    HDR',CR,LF,0
;
	JMP	RCVSERR
;
RCVDATA:
	MOV	A,D
	STA	RCVSNO
	MVI	A,1
	STA	DATAFLG
	MVI	C,0
	LXI	H,80H
RCVCHR:
	MVI	B,1
	CALL	RECV
	JC	RCVSTOT
	MOV	M,A
	INR	L
	JNZ	RCVCHR
	MOV	D,C
	XRA A
	STA	DATAFLG
	MVI	B,1
	CALL	RECV
	JC	RCVSTOT
	CMP	D
	JNZ	RCVCERR
	LDA	RCVSNO
	MOV	B,A
	LDA	SECTNO
	CMP	B
	JZ	RECVACK
	INR	A
	CMP	B
	JNZ	ABORT
	RET
;
RCVCERR:
	LDA	VSEEFLG
	ORA	A
	JZ	RCVCPR
	LDA	QFLG
	ORA	A
	JZ	RCVSERR
RCVCPR:
	CALL	ILPRT
	DB	'++  CKSUM ++ ',0
;
	JMP	RCVPRN
;
RECVACK:
	CALL	SENDACK
	JMP	RCVSECT
;
SENDACK:
	MVI	A,ACK
	CALL	SEND
	RET
;
SENDHDR:
	LDA	QFLG
	ORA	A
	JZ	SENDHNM
	CALL	ILPRT
	DB	'SEND # ',0
;
	LDA	SECTNO
	CALL	HEXO
	CALL	CRLF
SENDHNM:
 call nulsend ;send (nulno) nulls
	MVI	A,SOH
	CALL	SEND
	LDA	SECTNO
	CALL	SEND
	LDA	SECTNO
	CMA
	CALL	SEND
	RET

 ;sr delay the no of ms (roughly) in nulno
nulsend: lda nulno
nuls2: dcr a
 rm
 push psw
 push b
 lda fastclk
 ani 80h
 mov b,a
nuls3: dcr b
 jnz nuls3
 pop b
 pop psw
 jmp nuls2
;
SENDSEC:
	MVI	A,1
	STA	DATAFLG
	MVI	C,0
	LXI	H,80H
SENDC:
	MOV	A,M
	CALL	SEND
	INR	L
	JNZ	SENDC
	XRA A
	STA	DATAFLG
	RET
;
SENDCKS:
	MOV	A,C
	CALL	SEND
	RET
;
GETACK:
	MVI	B,7		;10 IN	ORIG PROG
	CALL	RECVDG
	JC	GETATOT
	CPI	ACK
	RZ
	CPI	CAN
	JZ	ABORT
	MOV	B,A
	LDA	QFLG
	ORA	A
	JZ	ACKERR
	MOV	A,B
	CALL	HEXO
	CALL	ILPRT
	DB	'H RCD, NOT ACK',CR,LF,0
;
ACKERR:
	LDA	ERRCT
	INR	A
	STA	ERRCT
	CPI	ERRLIM
	RC
	LDA	VSEEFLG
	ORA	A
	JZ	GACKV
	LDA	QFLG
	ORA	A
	JZ	CSABORT
GACKV:
	CALL	CKQUIT
	STC
	RZ
CSABORT:
	CALL	ERXIT
	DB	'CAN''T SEND SECTOR -- ABORTING',CR,LF,'$'
;
GETATOT:
	LDA	QFLG
	ORA	A
	JZ	ACKERR
	CALL	ILPRT
	DB	'TIMEOUT        ON ACK',CR,LF,0
;
	JMP	ACKERR
;
CKABORT:
	LDA	VSEEFLG
	ORA	A
	JZ	CKABGO
	LDA	QFLG
	ORA	A
	RZ
CKABGO:
	CALL	STAT
	RZ
	CALL	KEYIN
	CPI	CAN
	RNZ
ABORT:
	LXI	SP,STACK
ABORTL:
	MVI	B,1
	CALL	RECV
	JNC	ABORTL
	MVI	A,CAN
	CALL	SEND
ABORTW:
	MVI	B,1
	CALL	RECV
	JNC	ABORTW
	MVI	A,' '
	CALL	SEND
	CALL	ILPRT
	DB	'ROUTINE CANCELLED',CR,LF,BELL,0

	MVI	A,'B'		;TURN MULTI-FILE MODE..
	STA	BATCHFLG	;..OFF SO ROUTINE ENDS.
	JMP	DONETCE
;
INCRSNO:
	LDA	SECTNO
	INR	A
	STA	SECTNO
	RET
;
ERASFIL:
	LDA	BATCHFLG	;DON'T ASK FOR ERASE..
	ORA	A		;..IN	MULTI-FILE MODE,..
	JZ	NOASK		;..JUST DO IT.
	LXI	D,FCB
	MVI	C,SRCHF
	CALL	BDOS
	INR	A
	RZ
	CALL	ILPRT
	DB	'FILES EXISTS -- TYPE ''Y'' TO ERASE: ',BELL,0
;
	CALL	KEYIN
	PUSH	PSW
	CALL	TYPE
	POP	PSW
	CALL	UCASE
	CPI	'Y'
	JNZ	MENU
	CALL	CRLF
NOASK:
	LXI	D,FCB
	MVI	C,ERASE
	CALL	BDOS
	RET
;
BLKFILE:
	CALL	ILPRT	;ROUTINE IF NO FILE IS NAMED FOR "SEND" OR "RECEIVE"
	DB	CR,LF,'No file specified',CR,LF,BELL,0
;
	JMP	MENU
;
MAKEFIL:
	LXI	D,FCB
	MVI	C,MAKE
	CALL	BDOS
	INR	A
	RNZ
	CALL	ERXIT
	DB	'ERROR - CAN''T MAKE FILE',CR,LF
	DB	'DIRECTORY MUST BE FULL',CR,LF,'$'
;
OPENFIL:
	LXI	D,FCB
	MVI	C,OPEN
	CALL	BDOS
	INR	A
	JNZ	OPENOK
	CALL	ERXIT
	DB	'CAN''T OPEN FILE$'
;
OPENOK:
	LDA	BATCHFLG
	ORA	A
	JNZ	OPENOK1
	LDA	QFLG
	ORA	A
	RZ
OPENOK1:
	CALL	ILPRT
	DB	'FILE OPEN - EXTENT LENGTH: ',0
;
	LDA	FCB+15
	CALL	HEXO
	MVI	A,'H'
	CALL	TYPE
	CALL	CRLF
	RET
;
CLOSFIL:
	LXI	D,FCB
	MVI	C,CLOSE
	CALL	BDOS
	INR	A
	RNZ
	CALL	ERXIT
	DB	'CAN''T CLOSE FILE$'
;
RDSECT:
	LDA	SECINBF
	DCR	A
	STA	SECINBF
	JM	RDBLOCK
	LHLD	SECPTR
	LXI	D,80H
	CALL	MOVE128
	SHLD	SECPTR
	RET
;
RDBLOCK:
	LDA	EOFLG
	CPI	1
	STC
	RZ
	MVI	C,0
	LXI	D,DBUF
RDSECLP:
	PUSH	B
	PUSH	D
	MVI	C,STDMA
	CALL	BDOS
	LXI	D,FCB
	MVI	C,READ
	CALL	BDOS
	POP	D
	POP	B
	ORA	A
	JZ	RDSECOK
	DCR	A
	JZ	REOF
	CALL	ERXIT
	DB	'++     FILE READ ERROR ++$'
;
RDSECOK:
	LXI	H,80H
	DAD	D
	XCHG
	INR	C
	MOV	A,C
	CPI	16
	JZ	RDBFULL
	JMP	RDSECLP
;
REOF:
	MVI	A,1
	STA	EOFLG
	MOV	A,C
RDBFULL:
	STA	SECINBF
	LXI	H,DBUF
	SHLD	SECPTR
	LXI	D,80H
	MVI	C,STDMA
	CALL	BDOS
	JMP	RDSECT
;
WRSECT:
	LHLD	SECPTR
	XCHG
	LXI	H,80H
	CALL	MOVE128
	XCHG
	SHLD	SECPTR
	LDA	SECINBF
	INR	A
	STA	SECINBF
	CPI	16
	RNZ
WRBLOCK:
	LDA	SECINBF
	ORA	A
	RZ
	MOV	C,A
	LXI	D,DBUF
DKWRLP:
	PUSH	H
	PUSH	D
	PUSH	B
	MVI	C,STDMA
	CALL	BDOS
	LXI	D,FCB
	MVI	C,WRITE
	CALL	BDOS
	POP	B
	POP	D
	POP	H
	ORA	A
	JNZ	WRERR
	LXI	H,80H
	DAD	D
	XCHG
	DCR	C
	JNZ	DKWRLP
	XRA	A
	STA	SECINBF
	LXI	H,DBUF
	SHLD	SECPTR
	RET
;
WRERR:
	MVI	C,CAN
	CALL	SEND
	CALL	ERXIT
	DB	'ERROR WRITING FILE',CR,LF,'$'
;
RECVDG:
	CALL	IN$MODDATP
	CALL	IN$MODDATP
RECV:
	PUSH	D
	LDA	FASTCLK
	ORA	A
	JZ	MSEC
	MOV	A,B
	ADD	A
	MOV	B,A
MSEC:
	LXI	D,15000		;60% OF ORIG 50000
	CALL	CKABORT
MWTI:
	CALL	recsta
	JZ	MCHAR
	DCR	E
	JNZ	MWTI
	DCR	D
	JNZ	MWTI
	DCR	B
	JNZ	MSEC
	POP	D
	STC
	RET
;
MCHAR:
	CALL	IN$MODDATP
	POP	D
	PUSH	PSW
	ADD	C
	MOV	C,A
	LDA	RSEEFLG
	ORA	A
	JZ	MONIN
	LDA	VSEEFLG
	ORA	A
	JNZ	NOMONIN
	LDA	DATAFLG
	ORA	A
	JZ	NOMONIN
MONIN:
	POP	PSW
	PUSH	PSW
	CALL	SHOW
NOMONIN:
	POP	PSW
	ORA	A
	RET
;
SEND:
	PUSH	PSW
	LDA	SSEEFLG
	ORA	A
	JZ	MONOUT
	LDA	VSEEFLG
	ORA	A
	JNZ	NOMONOT
	LDA	DATAFLG
	ORA	A
	JZ	NOMONOT
MONOUT:
	POP	PSW
	PUSH	PSW
	CALL	SHOW
NOMONOT:
	POP	PSW
	PUSH	PSW
	ADD C
	MOV	C,A
SENDW:
	CALL	trasta
	JNZ	SENDW
	POP	PSW
	CALL	OUT$MODDATP
	RET
;
WAITNAK:
	LDA	VSEEFLG
	ORA	A
	JZ	WAITNPR
	LDA	QFLG
	ORA	A
	JZ	WAITNLP
WAITNPR:
	CALL	ILPRT
	DB	'AWAITING INITIAL NAK',CR,LF,0
;
WAITNLP:
	CALL	CKABORT
	MVI	B,1
	CALL	RECV
	CPI	NAK
	RZ
	CPI	CAN
	JZ	ABORT
	DCR	E
	JZ	ABORT
	JMP	WAITNLP
;
INITADR:
	LHLD	1
	LXI	D,3
	DAD	D
	SHLD	VSTAT+1
	DAD	D
	SHLD	VKEYIN+1
	DAD	D
	SHLD	VTYPE+1
	JMP	JMP$INITMOD	;RETURN DONE FROM THIS ROUTINE..
;
PROCOPT:
	LXI	D,FCB+1
	LDAX	D
	STA	OPTION
OPTLP:
	INX	D
	LDAX	D
	CPI	' '
	JZ	ENDOPT
	LXI	H,OPTBL
	MVI	B,OPTBE-OPTBL
OPTCK:
	CMP	M
	JNZ	OPTNO
	MVI	M,0
	JMP	OPTLP
OPTNO:
	INX	H
	DCR	B
	JNZ	OPTCK
	JMP	BADOPT
;
ENDOPT:
	LDA	VSEEFLG
	ORA	A
	RNZ
	STA	QFLG
	RET
;
DONE:
	LDA	BATCHFLG
	ORA	A
	JNZ	DONETCC
	LDA	QFLG
	ORA	A
	JZ	NMSTRNS
	LXI	H,FCB+1		;PUT FILE NAME IN..
	LXI	D,FTRNMSG	;..SPACES IN	MESSAGE..
	MVI	B,8		;..BELOW.
	CALL	MOVE
	INX	D		;PUT FILE TYPE AFTER..
	MVI	B,3		;..SKIPPING ONE SPACE..
	CALL	MOVE		;..BELOW.	
	CALL	ILPRT
FTRNMSG:
	DB	'              TRANSFERRED',CR,LF,CR,LF,0	;13 SPACES
;
NMSTRNS:
	LDA	FCB		;SAVE DRIVE NO.
	STA	DISKNO
	LXI	H,FCB		;BLANK OUT FILE CONTROL BLOCKS
	CALL	INITFCBS
	LDA	DISKNO		;PUT DRIVE NUMBER BACK
	STA	FCB
	LXI	H,RESTSN	;RESTORE SECTORE NUMBERS..
	LXI	D,SECTNOB	;..FOR NEW FILE TRANSFER.
	MVI	B,SECTNOE-SECTNOB ;ROUTINE ALSO DONE IN MENU.
	CALL	MOVE
	LDA	SENDFLG		;GOES TO EITHER SEND OR..
	ORA	A		;..RECEIVE FILE, DEPENDING..
	JNZ	SENDFIL		;..UPON WHICH ROUTINE SET..
	JMP	RCVFIL		;..THE FLAG IN	MULTI-FILE MODE.
;
DONETCC:
	MVI	A,TRUE		;INDICATE NO FILES BEING..
	STA	FSTFLG		;RESET MULTIFILE TRANS
	STA	NFILFLG		;..USED IN TERMINAL ROUTINE.
	CMA
	STA	SAVEFLG		;STOP MEMORY SAVE IN TERM ROUTINE.
	LDA	VSEEFLG
	ORA	A
	JZ	DONETC
	LDA	QFLG
	ORA	A
	JZ	donetca
DONETC:
	CALL	ILPRT
	DB	 CR,LF,'ALL TRANSFERS COMPLETED'
	DB	CR,LF,BELL,0
;
donetca:
	lda	discflg		;see if disconnect when thru
	ora	a
	jnz	donetce		;no, don't disconnect
donetcb:
	call	ilprt
	db	cr,lf,'++PRESS RETURN TO DISCONNECT++',bell,cr,lf,0
;
	mvi	c,rdcon
	call	bdos		;wait for response
	cpi	0dh		;carriage return
	jnz	donetcb		;nope
	call	ilprt
	db	cr,lf,'++DISCONNECTED++',cr,lf,0
;
	call	disconnt	;hang-up the modem
	jmp	exit		;go to CP/M
;
DONETCE:
	LDA	TERMFLG		;SEE IF RETURN TO..
	ORA	A		;..TERMINAL MODE..
	JNZ	MENU		;..AFTER X'FER.
	CALL	CRLF
	JMP	TERM
;
INITMOD:			;Put your USART set up routine here
				; if you need one.
	RET

;
MOVEFCB:
	LXI	H,FCB+16
	LXI	D,FCB
	MVI	B,16
	CALL	MOVE
	XRA A
	STA	FCBSNO
	STA	FCBEXT
	RET
;
SHOW:
	CPI	LF
	JZ	CTYPE
	CPI	CR
	JZ	CTYPE
	CPI	9
	JZ	CTYPE
	CPI	' '
	JC	SHOWHEX
	CPI	7FH
	JC	CTYPE
SHOWHEX:
	PUSH	PSW
	MVI	A,'('
	CALL	CTYPE
	POP	PSW
	CALL	HEXO
	MVI	A,')'
	JMP	CTYPE
;
CTYPE:
	PUSH	B
	PUSH	D
	PUSH	H
	MOV	E,A
	MVI	C,WRCON
	CALL	BDOS
	POP	H
	POP	D
	POP	B
	RET
;
CRLF:
	PUSH	PSW
	MVI	A,CR
	CALL	TYPE
	MVI	A,LF
	CALL	TYPE
	POP	PSW
	RET
;
TYPE:
	PUSH	PSW
	PUSH	B
	PUSH	D
	PUSH	H
	MOV	C,A
VTYPE:
	CALL	$-$
	POP	H
	POP	D
	POP	B
	POP	PSW
	RET
;
STAT:
	PUSH	B
	PUSH	D
	PUSH	H
VSTAT:
	CALL	$-$
	POP	H
	POP	D
	POP	B
	ORA	A
	RET
;
KEYIN:
	PUSH	B
	PUSH	D
	PUSH	H
VKEYIN:
	CALL	$-$
	POP	H
	POP	D
	POP	B
	RET
;
UCASE:
	CPI	61H		;CHANGES LOWER CASE CHARACTER..
	RC			;..IN	A-REG TO UPPER CASE.
	CPI	7BH
	RNC
	ANI	5FH
	RET
;
HEXO:
	PUSH	PSW
	RAR
	RAR
	RAR
	RAR
	CALL	NIBBL
	POP	PSW
NIBBL:
	ANI	0FH
	CPI	10
	JC	ISNUM
	ADI 7
ISNUM:
	ADI '0'
	JMP	TYPE
;
;RETURNS W/ ZERO SET IF RETRY ASKED. IF MULTI-FILE MODE, THEN
;NO QUESTIONS ASKED, JUST QUIT

CKQUIT:
	LDA	BATCHFLG
	ORA	A
	JNZ	CKQTASK		;ASK FOR RETRY
	INR	A		;RESET ZERO FLG
	RET
CKQTASK:
	XRA A
	STA	ERRCT
	CALL	ILPRT
	DB	'MULTIPLE ERRORS ENCOUNTERED.',CR,LF
	DB	'TYPE Q TO QUIT, R TO RETRY:  ',BELL,0
;
	CALL	KEYIN
	PUSH	PSW
	CALL	CRLF
	POP	PSW
	CALL	UCASE		;INSTEAD OF "ANI        5FH"
	CPI	'R'
	RZ
	CPI	'Q'
	JNZ	CKQUIT
	ORA	A
	RET
;
ILPRT:
	XTHL
ILPLP:
	MOV	A,M
	ORA	A
	JZ	ILPRET
	CALL	CTYPE
	INX	H
	JMP	ILPLP
ILPRET:
	XTHL
	RET
;
PRTMSG:
	MVI	C,PRINT
	JMP	BDOS
;
ERXIT:
	POP	D
	CALL	PRTMSG
	CALL	ILPRT
	DB	BELL,0
;
	LDA	BATCHFLG
	ORA	A
	JNZ	DONETCE
	MVI	A,'Q'		;RESET QFLG
	STA	QFLG
	JMP	ABORT		;ABORT OTHER COMPUTER
;
EXIT:
	LXI	D,80H
	MVI	C,STDMA
	CALL	BDOS
	JMP	0
;
MOVE128:
	MVI	B,128
MOVE:
	MOV	A,M
	STAX D
	INX	H
	INX	D
	DCR	B
	JNZ	MOVE
	RET
;
DISCONNT:		;Insert your code here to hangup up a direct
			; connect modem if you needed
	RET
;
;INITIALIZES CP/M FILE CONTROL BLOCKS AT 5CH AND 6CH

SETFCB:
	LXI	D,CMDBUF
	LXI	H,FCB
	CALL	CPMLINE
	CALL	PROCOPT
;
CHECKNM:
	LDA	FCB+1		;CHECK ON THE PRIMARY OPTION
	CPI	'E'		;RETURN IF ECHO OPTION
	RZ
	CPI	'M'		;RETURN TO MENU
	RZ
 cpi 'H'		;new h command inserted
 rz
	CPI	'C'
	RZ
	CPI	'T'
	JZ	TERMSEL
	CPI	'S'
	JZ	CKFILE
	CPI	'R'
	JNZ	BDOPT
	LDA	BATCHFLG	;IF MULT FILE MODE, THEN..
	ORA	A		;..RECV OPT DOES NOT NEED..
	RZ			;..NAME.
	JMP	CKFILE
;
BDOPT:
	CALL	ILPRT
	DB	CR,LF,'++Bad Option++',CR,LF,0
;
	JMP	REENT
;
CKFILE:
	LDA	FCB+17		;IF OPTION THAT NEEDS FILE NAME,..
	CPI	' '		;..THEN CHECK TO SEE IF NAME..
	RNZ			;..EXISTS. IF NOT..
REENT:
	CALL	ILPRT		;..DO EVERYTHING OVER.
	DB	CR,LF,'Re-enter PRIMARY option and file name only: ',BELL,0
;
	LXI	D,CMDBUF
	CALL	INBUFF
	JMP	SETFCB
;
TERMSEL:
	LDA	FCB+17
	CPI	' '
	JNZ	SAVAGN
	MVI	A,FALSE
	STA	SAVEFLG
	MVI	A,TRUE
	STA	NFILFLG
	CMA
	RET
;
SAVAGN:
	MVI	A,FALSE
	STA	NFILFLG
	RET
;
MENU:
	LXI	H,RESTSN	;RESTORE SECTORE NUMBERS..
	LXI	D,SECTNOB	;..FOR NEW FILE TRANSFER.
	MVI	B,SECTNOE-SECTNOB
	CALL	MOVE
	LXI	H,RESTROPT	;RESTORE OPTION TABLE
	LXI	D,OPTBL
	MVI	B,OPTBE-OPTBL
	CALL	MOVE
	MVI	A,0
	STA	MFFLG1		;RESET MFACCESS ROUTINE..
	CMA			;..AND MULTI TRANS IN	CASE..
	STA	FSTFLG		;..OF ABORT.
MENU1:
 mvi a,0ffh
 sta echfl+haven-rcan ;handover echo flag restored if nec
	LDA	XPRFLG		;TEST IF MENU SHOULD BE SHOWN
	ORA	A
	JNZ	XPRT
	CALL	ILPRT
	DB	CR,LF,CR,LF
	DB	'WRT   - Write file to disk (from terminal mode)',CR,LF
	DB	'DEL   - Erase present file (from terminal mode)',CR,LF
	DB	'RET   - Return to terminal mode with no loss of data',CR,LF
	DB	'DSC   - Disconnect',CR,LF
	DB	'XPR   - Toggle expert mode (Menu on/off)',CR,LF
	DB	'DIR   - List directory (may specify drive)',CR,LF
	DB	'CPM   - Exit to CP/M',CR,LF
	DB	'S     - Send CP/M file',CR,LF
	DB	'R     - Receive CP/M file',CR,LF
	DB	'T     - Terminal mode (optional file name)',CR,LF
	DB	'E     - Terminal mode with echo',CR,LF
	db	'H     - Hand over to remote computer',cr,lf,0
;
XPRT:
	CALL	ILPRT
	DB	CR,LF,CR,LF,'DEFAULT DRIVE: ',0
;
	MVI	C,25		;CURRENT DISK FUNCTION
	CALL	BDOS
	ADI	41H		;MAKE ASCII
	CALL	TYPE
	CALL	ILPRT
	DB	CR,LF,CR,LF,'Command: '
	DB	0
;
GETCMD:
	LXI	D,CMDBUF	;ENTER COMMAND
	CALL	INBUFF
	CALL	CRLF
	LXI	D,CMDBUF+2	;POINT TO COMMAND
	CALL	ILCOMP
	DB	'CPM',0
;
	JNC	EXIT
	CALL	ILCOMP
	DB	'DIR',0
;
	JNC	DIR
	CALL	ILCOMP
	DB	'RET',0
;
	JC	NXTOPT1		;CARRY SET = NO MATCH
	LHLD	HLSAVE		;RETURN TO TERMINAL..
	JMP	TERM		;..MODE WITH SAVE OPTION..
				;..IF PREVIOUSLY ENABLED.
;
NXTOPT1:
	CALL	ILCOMP		;DE SET FROM 1ST ILCOMP CALL
	DB	'DSC',0
;
	JNC	DISCON1
	CALL	ILCOMP
	DB	'WRT',0
;
	JNC	WRTFIL
	CALL	ILCOMP
	DB	'XPR',0
;
	JNC	XPRMODE
	CALL	ILCOMP
	DB	'DEL',0
;
	JNC	NEWFILE
NXTOPT2:
	PUSH	H
	LDA	CMDBUF+2
	LXI	H,COMPLIST
	CALL	COMPARE		;COMPARES LIST POINTED TO BY HL..
	POP	H		;..TO CHAR IN	A-REG.
	JC	MENU1		;CARRY SET = NO MATCH
DOOPT:
	PUSH	H		;LOAD ORIGINAL FCB WITH TRANSFER..
	CALL	SETFCB		;..CMDS AND GO TO BEGINNING OF..
	POP	H		;..PROGRAM. WILL FOLLOW SAME LOGIC..
	JMP	RESTART		;..AS IF PROGRAM WERE CALLED WITH..
				;..CP/M COMMAND LINE.
;
DISCON1:
	CALL	DISCONNT
	CALL	ILPRT
	DB	CR,LF,'++DISCONNECTED++',CR,LF,BELL,0
;
	JMP	MENU1
;
DIR:
	CALL	DIRLST
	JMP	XPRT
;
NEWFILE:
	LDA	FCB3+1
	CPI	' '
	JZ	MENU1		;IF NO FILE, DON'T ERASE
	LXI	D,FCB3
	MVI	C,ERASE
	CALL	BDOSRT
	MVI	A,TRUE		;DO NOT ALLOW TERMINAL..
	STA	NFILFLG		;..SAVE SINCE NO FILE..
	CMA			;..SPECIFIED.
	STA	SAVEFLG
	LXI	H,FCB3
	CALL	INITFCBS
	JMP	MENU1
;
WRTFIL:
	LDA	NFILFLG
	CPI	TRUE
	JZ	MENU1
	LDA	FCB3+1		;CHECK THAT FILE WAS REQUESTED
	CPI	' '
	JZ	MENU1
	LHLD	HLSAVE
	CALL	NUMRECS		;DISK WRITE ROUTINE AS USED IN..
	CALL	WRTDSK		;..IN THE INTDSKSV ROUTINE.
	CALL	CLOSE3
	MVI	A,TRUE
	STA	NFILFLG
	CMA
	STA	SAVEFLG
	LXI	H,FCB3
	CALL	INITFCBS	;BLANK OUT FCB SO WRITTEN FILE..
	JMP	MENU1		;..CAN'T BE ERASED.
;
XPRMODE:
	LDA	XPRFLG
	CMA
	STA	XPRFLG
	JMP	MENU1
;
COMPARE:
	MOV	B,M		;COMPARES A-REG WITH LIST..
COMPLP:
	INX	H		;..ADDRESSED BY HL. FIRST ELEMENT..
	CMP	M		;..OF LIST MUST BE NUMBER OF ELEMENTS..
	JZ	VALID		;..BEING COMPARED. RETURNS WITH..
	DCR	B		;..CARRY SET IF A-REG DOES NOT..
	JNZ	COMPLP		;.. CONTAIN	AN ELEMENT IN	LIST.
	STC
VALID:
	RET

COMPLIST:
	DB	5, 'S', 'R', 'T', 'E', 'H'	;handover instn added

ILCOMP:
	INLNCOMP	;A MACRO IN MACROS.LIB
;
INBUFF:
	INBUF		;A MACRO IN	"MACROS.LIB"
;
;IF ABOVE ROUTINE DOES NOT LET YOU EDIT IN A PROPER MANNER,
;THEN THE MACRO MAY BE SUBSTITUTED FOR THE FOLLOWING ROUTINE:

;INBUFF MVI	C,RDBUF
;	CALL	BDOSRT
;	RET		;BUT BE CAREFUL OF CONTROL-C


CPMLINE:
	CMDLINE		;A MACRO IN	"MACROS.LIB"
;
DIRLST:
	DIRLIST		;A MACRO IN	"MACROS.LIB"
;
NFILFLG:
	DB	FALSE	;NORMALLY SET TO FALSE. ALLOWS WRITE TO..
			;..MEMORY IN	TERMINAL MODE.
;
OPTION:
	DB	0
;
OPTBL:
ANSWFLG DB	'A'
DISCFLG DB	'D'
ORIGFLG DB	'O'
QFLG	DB	'Q'
RSEEFLG DB	'R'
SSEEFLG DB	'S'
VSEEFLG DB	'V'
TERMFLG DB	'T'
BATCHFLG DS	 1		;SET TO 'B' BY MENU. DOES NOT ALLOW MULTI-..
OPTBE	EQU	$		;..FILE XFER WHEN PROGRAM INITIALLY CALLED.
;
RESTROPT:			;MUST BE IN SAME ORDER AS TABLE ABOVE
	DB	'A','D','O','Q','R','S','V','T','B'
;
RESTSN	DB	0,0,0,0
	DW	DBUF
	DB	0
	DB	0
;
SECTNOB:
RCVSNO	DB	0
SECTNO	DB	0
ERRCT	DB	0
EOFLG	DB	0
SECPTR	DW	DBUF
SECINBF DB	0
DATAFLG DB	0
SECTNOE EQU	$

BADOPT:
	CALL	ILPRT
	DB	'INVALID OPTION',CR,LF,BELL,0
;
	JMP	MENU
;
FSTFLG	DB	TRUE

CMDBUF	DB	80H,0
	DS	80H
BADLIB	DB	CR,LF,'++BAD LIBRARY NUMBER CALLED++',CR,LF,'$'
HLSAVE	DS	2
DISKNO	DS	1
SENDFLG DS	1
NBSAVE	DS	2
BGNMS	DS	2
FILECT	DS	1
NAMECT	DS	1

	DS	40
STACK	DS	2
FCB3	DS	33
FCBBUF	DS	15

;	BDOS EQUATES

RDCON	EQU	1
WRCON	EQU	2
PRINT	EQU	9
RDBUF	EQU	10
CONST	EQU	11
OPEN	EQU	15
CLOSE	EQU	16
SRCHF	EQU	17
SRCHN	EQU	18
ERASE	EQU	19
READ	EQU	20
WRITE	EQU	21
MAKE	EQU	22
REN	EQU	23
STDMA	EQU	26
BDOS	EQU	5
REIPL	EQU	0
FCB	EQU	5CH
FCBEXT	EQU	FCB+12
FCBSNO	EQU	FCB+32
FCBRNO	EQU	FCB+32
FCB2	EQU	6CH

;Handover routines follow

 ;sr sets up handover on h instn
rgiv: call qhando ;rets z if handed over already
 jz menu ;if so
 lxi h,rcan ;will relocate prog from rcan onwards
 lxi d,haven ;put it here
 mvi b,0 ;to move 100h
 call move
 lda 101h ;byte to check valid on exit
 mov l,a
 lda rgiv ;and another
 mov h,a
 shld chbyts+haven-rcan ;keep them here
 lhld base+1 ;bios+3
 lxi d,4 ;will switch jp table addresses
 dad d ;const jp adr location
 lxi b,cstrt+haven-rcan ;to switch with const jp adr
 mov e,m
 mov m,c
 inx h
 mov d,m
 mov m,b
 xchg
 shld constx+haven-rcan ;conin jp adr kept
 xchg		    ;so we can replace
 inx h
 inx h ;conin jp adr location
 lxi b,cinrt+haven-rcan ;to switch
 mov e,m
 mov m,c
 inx h
 mov d,m
 mov m,b
 xchg
 shld coninx+haven-rcan ;conin jp adr kept
 xchg
 inx h
 inx h ;conout jp adr location
 lxi b,coutrt+haven-rcan ;to switch
 mov e,m
 mov m,c
 inx h
 mov d,m
 mov m,b
 xchg
 shld conotx+haven-rcan ;conout jp adr kept
 call ilprt
 db 0dh,0ah,'Handing over',0
	;msg will now be sent to modem too
 jmp xprt ;set up finished, back to command level

 ;sr ret z if handed over
qhando: push b
 push h
 mov b,a
 lxi h,cstrt+haven-rcan
 mov a,h ;hibyte of cstrt adr
 lhld 1
 mvi l,8 ;adr of const jp hibyte
 cmp m ;has cstrt adr been loaded?
 mov a,b
 pop h
 pop b
 ret

;The remainder is relocated at HAVEN so that
;the main program can be overwritten without a crash

;All adr refs to it have the offset HAVEN-RCAN added to them

 ;sr cancel handover
rcan: lhld base+1 ;bios+3
 lxi d,4
 dad d ;const jp adr location
 xchg
 lhld constx+haven-rcan ;orig value stored here
 xchg
 mov m,e ;put it back
 inx h
 mov m,d
 inx h
 inx h ;conin jp adr location
 xchg
 lhld coninx+haven-rcan
 xchg
 mov m,e
 inx h
 mov m,d
 inx h
 inx h ;conout jp adr location
 xchg
 lhld conotx+haven-rcan
 xchg
 mov m,e
 inx h
 mov m,d
 lhld chbyts+haven-rcan ;now see if modem7 prog overwritten
 lda 101h
 cmp l
 jnz base ;if so go to cpm warm boot
 lda rgiv ;the other checkbyte
 cmp h
 jnz base
 lxi sp,stack
 jmp menu ;otherwise back to modem7

 ;replaces const
cstrt: lxi h,cst2+haven-rcan
 push h ;retadr
 lhld constx+haven-rcan
 pchl ;=call const
cst2: ora a
 jz cst3a+haven-rcan ;jp if no key
 lxi h,cst3+haven-rcan
 push h ;retadr
 lhld coninx+haven-rcan
 pchl ;=call conin
cst3: cpi eschar ;escape from handover?
 jz rcan+haven-rcan
 sta xbuf+haven-rcan ;or keep char
 jmp cst4+haven-rcan
cst3a: lda xbuf+haven-rcan
 ora a
 jz cst5+haven-rcan
cst4: mvi a,0ffh ;indicate ready
 ret
cst5: call minst+haven-rcan ;ready to receive?
 jz cst4+haven-rcan ;jp if yes
 xra a ;no char
 ret

 ;replaces conin
cinrt: call cstrt+haven-rcan ;also handles esc
 ora a
 jz cinrt+haven-rcan ;loop till ready
 lxi h,xbuf+haven-rcan ;see if key char
 mov a,m
 mvi m,0 ;null the buf anyway
 ora a
 rnz ;finished if it wasn't null
 call min+haven-rcan ;else must be modem inp
 cpi ' '
 rc ;finished if null or actual control
 cpi '^' ;will it be ctrl seq?
 mvi b,1fh ;ctrl mask
 jz cin2+haven-rcan
 mvi b,7fh ;or null mask
cin2: lxi h,ctrlfl+haven-rcan ;adr of ctrl mask
 ana m ;use it
 mov m,b ;and update it
 ret ;masked char in a

 ;replaces conout
coutrt: push b
 call cstrt+haven-rcan ;handles esc
 pop b
 push b
 lxi h,cout2+haven-rcan
 push h ;retadr
 lhld conotx+haven-rcan
 pchl ;=call conout
cout2: pop b
 lda echfl+haven-rcan ;echo flag
 ora a
 rz ;no echo unless set
 push b
 call coutm+haven-rcan ;send echo
 pop b
 mov a,c
 sui 0ah
 rnz
 mov c,a ;null to send
 lda lfnulls ;send this no of nulls after a linefeed
 mov b,a
 dcr b
cout3: call coutm+haven-rcan
 dcr b
 jp cout3+haven-rcan
 mvi c,'/' ;send for start of remote user's line

coutm: call moust+haven-rcan ;ready to send?
 jnz coutm+haven-rcan ;if not, loop
 mov a,c
 jmp mout+haven-rcan ;send

 ;sr ret z if modem inp ready
minst: xra a
 out mstatp
 in mstatp
 cma
 ani 1
 ret

 ;sr ret z if modem outp ready
moust: mvi a,10h
 out mstatp
 in mstatp
 cma
 ani 0ch
 ret

 ;sr inp from modem
min: in mdatp
 ret

 ;sr outp to modem
mout: out mdatp
 ret

constx: dw 0 ;to keep const jp adr
coninx: dw 0 ;ditto conin
conotx: dw 0 ;ditto conout
xbuf: db 0 ;key char buffer
chbyts: dw 0 ;bytes stashed to check for overwriting
ctrlfl: db 7fh ;ctrl mask, changed to 1f following '^'
echfl: db 0ffh ;echo flag, zeroed during file transfer
lfnulls: db 3 ;nulls to remote computer after linefeed

DBUF	DS	16*128		;16 SECTOR DISK BUFFER
NAMEBUF DS	1		;BUFFER FOR NAMES IN	BATCH MODE. OVERFLOWS..
				;..ABOVE PROGRAM CODE.
LAST:
	END	start