;
;		DISK UTILITY - DU.ASM
;		  (revised 8/12/80)
;
;DU.ASM 8/6/78 BY WARD CHRISTENSEN
;11/12/78 ADD LOGIN COMMAND
;11/26/78 ADD DISK # TO LOGIN COMMAND
;02/25/79 PUT SECTOR READ INTO "S" COMMAND
;03/15/79 ADD CHANGES FOR CP/M ON MICROPOLIS
;	  FIX WRAP-AROUND FROM TRACK 0 TO TRACK 76
;	  ON MINUS COMMAND.
;	  (BY KEITH PETERSEN, W8SDZ)
;03/18/79 ADD CHANGES TO CALCGRP ROUTINE TO ALLOW
;	  FOR CONDITIONAL ASSEMBLY FOR CP/M ON
;	  MICROPOLIS.  (KBP)
;09/04/79 ADD REGISTER SAVES TO DIRECT VECTOR
;	  CALLS. REMOVE UNUSED MACRO. DELETED
;	  SEVERAL UNUSED ROUTINES.  (KBP)
;11/27/79 ADD CHANGES FOR DIGITAL MICROSYSTEMS
;	  DOUBLE DENSITY USING THE FDC3 CONTROLLER
;	  BOARD, AND NORTHSTAR DOUBLE DENSITY (KBP)
;12/04/79 CORRECT ERROR IN GROUP NUMBER DISPLAY FOR
;	  NORTHSTAR DOUBLE DENSITY. (KBP)
;
;02/16/80 CORRECT VERSION 2.0 INCOMPATIBILITY IN 'F' COMMAND
;	  CHANGE DISPLAY TO SHOW BOTH RELATIVE AND PHYSICAL SECTOR
;	  (BRUCE RATOFF, ACGNJ)
;
;07/01/80 ADD CHANGES FOR THINKER TOYS DJ2D CONTROLLER AND
;	  1024 BYTE DOUBLE DENSITY SECTORS
;	  (Jeff Hammersley)
;
;08/12/80 ADD CHANGES FOR MICROMATION SINGLE-SIDED DBL DENSITY
;	  FORMAT - NOTE - FOR TRACKS 2-76 ONLY (TRACKS 0 & 1
;	  ARE SINGLE DENSITY) (CHARLES STROM)
;
;
STDCPM	EQU	0	;TRUE IF STANDARD CP/M
MICROP	EQU	0	;TRUE IF MICROPOLIS CP/M
DIGDBL	EQU	0	;TRUE IF DIGITAL MICROSYSTEMS DBL DENS
NSDBL	EQU	0	;TRUE IF NORTHSTAR DBL DENSITY CP/M
TTDBL1	EQU	0	;TRUE IF THINKER TOYS DBL DENSITY
			; 1024 byte sectors
MMDBL	EQU	1	;TRUE IF MICROMATION DBL DENSITY
;
CR	EQU	0DH
LF	EQU	0AH
;
;Functions supported:
;
;	Tnn	Seek to track nn (no read)
;	Snn	Position to sector nn, and read
;	Gnn	Position to group nn and read.
;	Fname	print directory for file "name"
;		N-O-T-E this is not a direct disk
;		read, so the W command MAY NOT be
;		executed after 'F'. (must do G, +
;		or - command first)
;
;	L	Logs in the disk (used if a disk other
;		than the one DU resides on, is placed
;		in the system)
;
;	Ln	Logs in disk 'n', such as: LA
;
;	D	Dump sector, hex + ASCII
;	A	Dump sector, ASCII only
;	H	Dump sector, hex only
;
;note all dump commands (D, A, H) may be optionally
;	followed by a starting and ending address:
;	D0,7F  is the same as just D
;	D3,5
;	A20,3F
;
;	CHaddr,val,val,val... change hex in sector
;	CAaddr,char string... change ASCII in sector
;		(must W to have changes written to disk)
;Note that the C command echoes the overlaid data for
;	verification
;
;	+	advance 1 sector (if below track 2,
;		this advances to next numerical, if
;		2 or >, advances based on CP/M's normal
;		sector scrambling algorithm, i.e. so +
;		will get the next logical sector of the file
;	-	backs up 1 logical sector
;
;		note + and - may take an amount:
;		for example, +F steps in 15 sectors
;
;	?	Says what sector, track, and group
;		are current
;	R	Reads the sector currently positioned to
;		into memory.  Note R (Read) is implicit in
;		the G, +, and - commands, but N-O-T in the
;		S and T commands (I did it because I was
;		tired of disk reading after T command before
;		I had a chance to issue the S command)
;	W	Write back the current sector (N-O-T-E may
;		not be used after an F command, as CP/M was
;		used to find the file in the directory
;	X	Exit back to CP/M (Must press return).  Ctl-c
;		was too easy to hit over modem lines, so I
;		decided on 2-byte (X, CR) to exit.
;
;
	ORG	100H
;
	LXI	SP,STACK
;SET UP LOCAL JMPS TO BIOS
	LHLD	1
	LXI	D,3
	DAD	D
	SHLD	VCONST+1
	DAD	D
	SHLD	VCONIN+1
	DAD	D
	SHLD	VCONOUT+1
	DAD	D	;LIST
	DAD	D	;PUNCH
	DAD	D	;RDR
	DAD	D	;HOME
	DAD	D	;SEL DISK
	DAD	D
	SHLD	VSETTRK+1
	DAD	D
	SHLD	VSETSEC+1
	DAD	D	;SETDMA
	DAD	D
	SHLD	VREAD+1
	DAD	D
	SHLD	VWRITE+1
	CALL	ILPRT
	DB	'DISK UTIL 7/01/80',CR,LF
	IF	STDCPM
	DB	'Standard CP/M Version'
	ENDIF
	IF	MICROP
	DB	'Micropolis Version'
	ENDIF
	IF	DIGDBL
	DB	'DD Digital Microsystems Version'
	ENDIF
	IF	NSDBL
	DB	'DD Northstar Version'
	ENDIF
	IF	TTDBL1
	DB	'Thinker Toys DBL Density (1024 byte sectors)'
	ENDIF
	IF 	MMDBL
	DB	'Micromation DBL Density (Tracks 2-76 ONLY!)'
	ENDIF
	DB	CR,LF,0
PROMPT	LXI	SP,STACK
	CALL	RDBUF
	LXI	H,INBUF
	MOV	A,M
	INX	H
	CPI	'T'
	JZ	POS
	CPI	'S'
	JZ	POS
	CPI	'G'
	JZ	POS
	CPI	'F'
	JZ	POSFIL
	CPI	'L'
	JZ	LOGIN
	CPI	'D'
	JZ	DUMP
	CPI	'A'
	JZ	DUMP
	CPI	'H'
	JZ	DUMP
	CPI	'C'
	JZ	CHG
	CPI	'+'
	JZ	PLUS
	CPI	'-'
	JZ	MINUS
	CPI	'?'
	JZ	INQ
	CPI	'R'
	JZ	DOREAD
	CPI	'W'
	JZ	DOWRITE
	CPI	'X'
	JZ	0
WHAT	CALL	ILPRT
	DB	'?',0
	JMP	PROMPT
;
LOGIN	MVI	C,RESETDK
	CALL	BDOS
	LDA	INBUF+1	;DISK REQ?
	LXI	D,0
	CPI	CR
	JZ	LGNODK
	SUI	'A'
	MOV	E,A
LGNODK	MVI	C,SELDK
	CALL	BDOS
	CALL	NOWRITE
	JMP	PROMPT
;
NOWRITE	XRA	A	;GET 0
	STA	WRFLG	;CAN'T WRITE NOW
	RET
;
DUMP	LDA	WRFLG
	ORA	A
	JNZ	DUMPOK
	CALL	ILPRT
	DB	'++CAN''T DUMP, NO SECTOR READ.',CR,LF,0
EXPL	CALL	ILPRT
	DB	'USE G COMMAND FOLLOWING F,',CR,LF
	DB	'OR R FOLLOWING S OR T',CR,LF,0
	JMP	PROMPT
;
DUMPOK	MOV	A,M
	CPI	CR
	JNZ	DUMPNDF
;USE DEFAULT
	LXI	B,0
	LXI	D,7FH
	JMP	DUMP1
;
DUMPNDF	CALL	HEXIN
	MOV	B,D
	MOV	C,E
	CPI	CR
	JZ	DUMP1
	INX	H	;SKIP ','
	CALL	HEXIN
;
;BC = START, DE = END
;
DUMP1	MOV	A,B
	ORA	D
	JNZ	WHAT
	MOV	A,C
	ORA	E
	JM	WHAT	;>7FH
	MOV	H,B
	MOV	A,C
	ORI	80H
	MOV	L,A
	MOV	A,E
	ORI	80H
	MOV	E,A
DUMPLP	MOV	A,L
	ANI	7FH
	CALL	HEX
	CALL	SPACE
	CALL	SPACE
	LDA	INBUF
	CPI	'A'
	JZ	DUMPAS
	PUSH	H	;SAVE START
DHEX	MOV	A,M
	CALL	HEX
	MOV	A,L
	ANI	3
	CPI	3
	CZ	SPACE
	MOV	A,L
	ANI	7
	CPI	7
	CZ	SPACE
	MOV	A,E
	CMP	L
	JZ	DPOP
	INX	H
	MOV	A,L
	ANI	0FH
	JNZ	DHEX
DPOP	LDA	INBUF
	CPI	'H'
	JZ	DNOAS	;HEX ONLY
	POP	H	;GET START ADDR
DUMPAS	CALL	ASTER
DCHR	MOV	A,M
	CPI	' '
	JC	DPER
	CPI	7FH
	JC	DOK
DPER	MVI	A,'.'
DOK	CALL	TYPE
	MOV	A,E
	CMP	L
	JZ	DEND
	INX	H
	MOV	A,L
	ANI	0FH
	JNZ	DCHR
DEND	CALL	ASTER
	CALL	CRLF
	CALL	CONST
	ORA	A
	JNZ	PROMPT
	MOV	A,E
	CMP	L
	JZ	PROMPT
	JMP	DUMPLP
;
DNOAS	POP	B
	CALL	CRLF
	MOV	A,E
	CMP	L
	JZ	PROMPT
	JMP	DUMPLP
;
;POSITION
;
POS	PUSH	PSW
	CALL	NOWRITE
	MOV	A,M
	CPI	CR
	JZ	WHAT
	CALL	HEXIN
	POP	PSW
	CPI	'T'
	JZ	POSTRK
	CPI	'S'
	JZ	POSSEC
	CPI	'G'
	JZ	POSGRP
	JMP	WHAT
;
POSTRK	MOV	A,E
	CALL	SETTRK
	JMP	CALCGRP
;
POSSEC	MOV	A,E
	ORA	A
	JZ	WHAT
;
	IF	STDCPM
	CPI	27
	ENDIF
;
	IF	MICROP
	CPI	33
	ENDIF
;
	IF	DIGDBL
	CPI	59
	ENDIF
;
	IF	NSDBL
	CPI	41
	ENDIF
;
	IF	TTDBL1
	CPI	65
	ENDIF
;
	IF	MMDBL
	CPI	53
	ENDIF
;
	JNC	WHAT
	CALL	SETSEC
	CALL	READ
;
CALCGRP	LDA	CURTRK
	SUI	2	;GRP 0 IS TRK 2
	MOV	L,A
	MVI	H,0
	MOV	D,H
	MOV	E,L
	DAD	H	;X2
;
	IF	STDCPM
	DAD	D	;X3
	DAD	H	;X6
	DAD	H	;X12
	DAD	D	;X13
	DAD	H	;X26
	ENDIF
;
	IF	MICROP
	DAD	H	;X4
	DAD	H	;X8
	DAD	H	;X16
	DAD	H	;X32
	ENDIF
;
	IF	DIGDBL
	DAD	D	;X3
	DAD     H	;X6
	DAD	D	;X7
	DAD	H	;X14
	DAD	H	;X28
	DAD	D	;X29
	DAD	H	;X58
	ENDIF
;
	IF	NSDBL
	DAD	H	;X4
	DAD	H	;X8
	DAD	D	;X9
	DAD	D	;X10
	DAD	H	;X20
	DAD	H	;X40
	ENDIF
;
	IF	TTDBL1
	DAD	H	;X4
	DAD	H	;X8
	DAD	H	;X16
	DAD	H	;X32
	DAD	H	;X64
	ENDIF
;
	IF	MMDBL
	DAD	D	;X3
	DAD	H	;X6
	DAD	H	;X12
	DAD	D	;X13
	DAD	H	;X26
	DAD	H	;X52
	ENDIF
;
	LDA	CURSEC
	DCR	A
	ADD	L
	MOV	L,A
	MOV	A,H
	ACI	0
	MOV	H,A
	MOV	A,L
;
	IF	STDCPM OR NSDBL
	ANI	07H
	ENDIF
;
	IF	MICROP OR DIGDBL OR TTDBL1 OR MMDBL
	ANI	0FH
	ENDIF
;
	STA	DISP
	DAD	H
	DAD	H
	DAD	H
	DAD	H
;
	IF	STDCPM OR NSDBL
	DAD	H
	ENDIF
;
	MOV	A,H
	STA	GROUP
	JMP	INQ
;
POSGRP	MOV	A,E
	STA	GROUP
	XRA	A
	STA	DISP
	MOV	L,E	;MULTIPLY
	MVI	H,0	;BY 8
	DAD	H
	DAD	H
	DAD	H
;
	IF	MICROP OR DIGDBL OR TTDBL1 OR MMDBL
	DAD	H	;MULTIPLY BY 16 INSTEAD OF 8
	ENDIF
;
	IF	STDCPM
;DIVIDE BY 26, QUOTIENT = TRK, REMAINDER = SECTOR
	LXI	D,-26
	ENDIF
;
	IF	MICROP
;DIVIDE BY 32, QUOTIENT = TRK, REMAINDER = SECTOR
	LXI	D,-32
	ENDIF
;
	IF	DIGDBL
;DIVIDE BY 58, QUOTIENT = TRK, REMAINDER = SECTOR
	LXI	D,-58
	ENDIF
;
	IF	NSDBL
;DIVIDE BY 40, QUOTIENT = TRK, REMAINDER = SECTOR
	LXI	D,-40
	ENDIF
;
	IF	TTDBL1
;DIVIDE BY 64, QUOTIENT = TRK, REMAINDER = SECTOR
	LXI	D,-64
	ENDIF
;
	IF MMDBL
;DIVIDE BY 52, QUOTIENT = TRK, REMAINDER = SECTOR
	LXI	D,-52
	ENDIF
;
	MVI	B,0	;TRK
DIVLP	INR	B
	DAD	D
	JC	DIVLP
	DCR	B
;
	IF	STDCPM
	LXI	D,26
	ENDIF
;
	IF	MICROP
	LXI	D,32
	ENDIF
;
	IF	DIGDBL
	LXI	D,58
	ENDIF
;
	IF	NSDBL
	LXI	D,40
	ENDIF
;
	IF	TTDBL1
	LXI	D,64
	ENDIF
;
	IF	MMDBL
	LXI	D,52
	ENDIF
;
	DAD	D
	MOV	A,B
	ADI	2	;GROUP 0 IS TRK 2
	CALL	SETTRK
	MOV	A,L
	INR	A
	CALL	SETSEC
	CALL	READ
	JMP	INQ
;
POSFIL	CALL	NOWRITE
	LXI	D,FCB
	XRA	A
	STAX	D
	INX	D
	MVI	B,8
	CALL	MVNAME
	MVI	B,3
	CALL	MVNAME
	LXI	D,FCB
	MVI	C,SEARCHF	;USED TO BE OPEN - DIDN'T WORK IN 2.0
	CALL	BDOS
	INR	A
	JNZ	FLOK
	CALL	ILPRT
	DB	'++FILE NOT FOUND',0
	JMP	PROMPT
;
FLOK	DCR	A
	ANI	3
	MOV	L,A
	MVI	H,0
	DAD	H
	DAD	H
	DAD	H
	DAD	H
	DAD	H
	LXI	D,80H
	DAD	D
	LXI	D,32
	XCHG
	DAD	D
	XCHG
	MVI	A,'I'
	STA	INBUF+1
	JMP	DUMPLP
;
MVNAME	MOV	A,M
	CPI	'.'
	JZ	MVIPAD
	CPI	CR
	JZ	PAD
	STAX	D
	INX	H
	INX	D
	DCR	B
	JNZ	MVNAME
	MOV	A,M
	CPI	CR
	RZ
	INX	H
	CPI	'.'
	RZ
	JMP	WHAT
;
MVIPAD	INX	H
PAD	MVI	A,' '
	STAX	D
	INX	D
	DCR	B
	JNZ	PAD
	RET
;
PLUS	LXI	D,1
	MOV	A,M
	CPI	CR
	JZ	PLUSGO
	CALL	HEXIN
PLUSGO	LDA	CURSEC
	INR	A
;
	IF	STDCPM
	CPI	27
	ENDIF
;
	IF	MICROP
	CPI	33
	ENDIF
;
	IF	DIGDBL
	CPI	59
	ENDIF
;
	IF	NSDBL
	CPI	41
	ENDIF
;
	IF	TTDBL1
	CPI	65
	ENDIF
;
	IF	MMDBL
	CPI	53
	ENDIF
;
	JNZ	PLUSOK
	LDA	CURTRK
	INR	A
	STA	CURTRK
	MVI	A,1
PLUSOK	STA	CURSEC
	DCR	E
	JNZ	PLUSGO
PLUSMI	LDA	CURSEC
	CALL	SETSEC
	LDA	CURTRK
	CALL	SETTRK
	CALL	READ
	JMP	CALCGRP
;
MINUS	LXI	D,1
	MOV	A,M
	CPI	CR
	JZ	MINGO
	CALL	HEXIN
MINGO	LDA	CURSEC
	DCR	A
	JNZ	MINOK
	LDA	CURTRK
	DCR	A
	STA	CURTRK
;
	IF	STDCPM
	MVI	A,26
	ENDIF
;
	IF	MICROP
	MVI	A,32
	ENDIF
;
	IF	DIGDBL
	MVI	A,58
	ENDIF
;
	IF	NSDBL
	MVI	A,40
	ENDIF
;
	IF	TTDBL1
	MVI	A,64
	ENDIF
;
	IF	MMDBL
	MVI	A,52
	ENDIF
;
MINOK	STA	CURSEC
	DCR	E
	JNZ	MINGO
	JMP	PLUSMI
;
INQ	LDA	CURTRK
	CPI	2
	JC	NOGRP
	CALL	ILPRT
	DB	'G=',0
	LDA	GROUP
	CALL	HEX
	MVI	A,':'
	CALL	TYPE
	LDA	DISP
;
	IF	STDCPM OR NSDBL
	ORI	'0'
	CALL	TYPE
	ENDIF
;
	IF	MICROP OR DIGDBL OR TTDBL1 OR MMDBL
	CALL	HEX
	ENDIF
;
	MVI	A,','
	CALL	TYPE
NOGRP	CALL	ILPRT
	DB	' T=',0
	LDA	CURTRK
	CALL	HEX
	CALL	ILPRT
	DB	', RS=',0	;DISPLAY RELATIVE SECTOR #
	LDA	CURSEC
	CALL	HEX
	CALL	ILPRT		;DISPLAY PHYSICAL (MAPPED) SECTOR #
	DB	', PS=',0
	LDA	MAPSEC
	CALL	HEX
	JMP	PROMPT
;
CHG	MOV	A,M	;GET TYPE (HEX, ASCII)
	PUSH	PSW
	INX	H
	CALL	HEXIN
	INX	H
	CPI	','
	JNZ	WHAT
	MOV	A,D
	ORA	A
	JNZ	WHAT
	MOV	A,E
	ORA	A
	JM	WHAT
	ORI	80H
	MOV	E,A	;POINT TO BUFFER
	POP	PSW
	CPI	'H'
	JZ	CHGHEX
	CPI	'A'
	JNZ	WHAT
;CHANGE ASCII
CHGALP	MOV	A,M
	CPI	CR
	JZ	PROMPT
	LDAX	D
	CPI	' '
	JC	CHGAHX
	CPI	7FH
	JNC	CHGAHX
	JMP	CHGA2
CHGAHX	MVI	A,'('
	CALL	TYPE
	LDAX	D
	CALL	HEX
	MVI	A,')'
CHGA2	CALL	TYPE
	MOV	A,M
	STAX	D
	INX	H
	INR	E
	JNZ	CHGALP
	MOV	A,M
	CPI	CR
	JZ	PROMPT
	JMP	WHAT
;
;CHANGE HEX
CHGHEX	MOV	A,M
	CPI	CR
	JZ	PROMPT
	PUSH	D
	CALL	HEXIN
	MOV	A,E
	POP	D
	PUSH	PSW
	LDAX	D
	CALL	HEX
	POP	PSW
	STAX	D
	MOV	A,M
	CPI	CR
	JZ	PROMPT
	CPI	','
	INX	H
	INR	E
	JNZ	CHGHEX
	MOV	A,M
	CPI	CR
	JZ	PROMPT
	JMP	WHAT
;
DOREAD	CALL	READ
	JMP	PROMPT
;
DOWRITE	CALL	WRITE
	JMP	PROMPT
;
HEX	PUSH	PSW
	RAR
	RAR
	RAR
	RAR
	CALL	NIBBL
	POP	PSW
NIBBL	ANI	0FH
	CPI	10
	JC	HEXNU
	ADI	7
HEXNU	ADI	'0'
	JMP	TYPE
;
SPACE	MVI	A,' '
	JMP	TYPE
;
ASTER	MVI	A,'*'
	JMP	TYPE
;
ILPRT	XTHL
ILPLP	MOV	A,M
	CALL	TYPE
	INX	H
	MOV	A,M
	ORA	A
	JNZ	ILPLP
	INX	H
	XTHL
	RET
;
HEXIN	LXI	D,0
HINLP	MOV	A,M
	CPI	CR
	RZ
	CPI	','
	RZ
	CPI	'0'
	JC	WHAT
	CPI	'9'+1
	JC	HINNUM
	CPI	'A'
	JC	WHAT
	CPI	'F'+1
	JNC	WHAT
	SUI	7
HINNUM	SUI	'0'
	XCHG
	DAD	H
	DAD	H
	DAD	H
	DAD	H
	ADD	L
	MOV	L,A
	XCHG
	INX	H
	JMP	HINLP
;
RDBUF	CALL	ILPRT
	DB	CR,LF,':',0
	LXI	H,INBUF
	MVI	B,0
RDBLP	CALL	CONIN
	CPI	'U'-40H
	JZ	RDCTLU
	CPI	CR
	JZ	RDCR
	CPI	8
	JZ	RDBS
	CPI	7FH
	JZ	RDBS
	CPI	'R'-40H
	JZ	RDCTLR
	MOV	M,A
	INX	H
	INR	B
	CALL	TYPE
	JMP	RDBLP
;
RDCR	MOV	M,A
	CALL	TYPE
	MVI	A,LF
	CALL	TYPE
	RET
;
RDBS	XRA	A
	ORA	B
	JZ	RDCTLU
	DCX	H
	DCR	B
	MOV	A,M
	CALL	TYPE
	JMP	RDBLP
;
RDCTLR	MVI	M,CR
	CALL	CRLF
	LXI	H,INBUF
	MVI	B,0
RDCRL	MOV	A,M
	CPI	CR
	JZ	RDBLP
	CALL	TYPE
	INR	B
	INX	H
	JMP	RDCRL
;
RDCTLU	MVI	A,'^'
	CALL	TYPE
	MVI	A,'U'
	CALL	TYPE
	JMP	RDBUF
;
CRLF	MVI	A,CR
	CALL	TYPE
	MVI	A,LF
	JMP	TYPE
;
CONST:	PUSH	B
	PUSH	D
	PUSH	H
VCONST	CALL	$-$	;MODIFIED BY INIT
	POP	H
	POP	D
	POP	B
	RET
;
CONIN:	PUSH	B
	PUSH	D
	PUSH	H
VCONIN	CALL	$-$	;MODIFIED BY INIT
	POP	H
	POP	D
	POP	B
	RET
;
TYPE:	PUSH	B
	PUSH	D
	PUSH	H
	MOV	C,A	;FOR CONOUT
VCONOUT	CALL	$-$	;MODIFIED BY INIT
	POP	H
	POP	D
	POP	B
	RET
;
SETTRK	EQU	$
	IF	STDCPM OR MICROP OR DIGDBL OR TTDBL1 OR MMDBL
	CPI	77	;TRAP OUT MORE THAN 77
	ENDIF
;
	IF	NSDBL
	CPI	35	;TRAP OUT MORE THAN 34
	ENDIF
;
	JC	SETTRK2
;
	IF	STDCPM OR MICROP OR DIGDBL OR TTDBL1 OR MMDBL
	MVI	A,76	;77TH TRACK IS 76
	ENDIF
;
	IF	NSDBL
	MVI	A,34	;35TH TRACK IS 34
	ENDIF
;
SETTRK2	STA	CURTRK
	PUSH	B
	PUSH	D
	PUSH	H
	MOV	C,A
VSETTRK	CALL	$-$	;MODIFIED BY INIT
	POP	H
	POP	D
	POP	B
	RET
;
SETSEC	PUSH	B
	PUSH	D
	PUSH	H
	STA	CURSEC
	MOV	C,A
	LDA	CURTRK
	CPI	2
	JC	XSETSEC	;DON'T SCRAMBLE TRK'S 0-1
	LXI	H,SECTBL-1
	MOV	A,C
	ADD	L
	MOV	L,A
	MOV	A,H
	ACI	0
	MOV	H,A
	MOV	C,M
XSETSEC	MOV	A,C	;REMEMBER MAPPED SECTOR # FOR INQ
	STA	MAPSEC
VSETSEC	CALL	$-$	;MODIFIED BY INIT
	POP	H
	POP	D
	POP	B
	RET
;
READ:	PUSH	B
	PUSH	D
	PUSH	H
	MVI	A,1
	STA	WRFLG
VREAD	CALL	$-$	;MODIFIED BY INIT
	POP	H
	POP	D
	POP	B
	RET
;
WRITE:	LDA	WRFLG
	ORA	A
	JNZ	WRITE2
	CALL	ILPRT
	DB	'++CANNOT WRITE UNLESS READ ISSUED'
	DB	CR,LF,0
	JMP	EXPL
;
WRITE2	PUSH	B
	PUSH	D
	PUSH	H
VWRITE	CALL	$-$	;MODIFIED BY INIT
	POP	H
	POP	D
	POP	B
	RET
; 
	IF	STDCPM
SECTBL	DB	1,7,13,19,25,5,11,17,23,3,09,15,21
	DB	2,8,14,20,26,6,12,18,24,4,10,16,22
	ENDIF
; 
	IF	MICROP
SECTBL	DB	1,2,11,12,21,22,31,32,9,10,19,20,29,30,7,8
	DB	17,18,27,28,5,6,15,16,25,26,3,4,13,14,23,24
	ENDIF
; 
	IF	DIGDBL
SECTBL	DB	1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18
	DB	19,20,21,22,23,24,25,26,27,28,29,30,31,32,33
	DB	34,35,36,37,38,39,40,41,42,43,44,45,46,47,48
	DB	49,50,51,52,53,54,55,56,57,58
	ENDIF
;
	IF	NSDBL
SECTBL	DB	1,2,3,4,21,22,23,24,5,6,7,8,25,26,27,28
	DB	9,10,11,12,29,30,31,32,13,14,15,16
	DB	33,34,35,36,17,18,19,20,37,38,39,40
	ENDIF
;
	IF	TTDBL1
SECTBL	DB	1,2,3,4,5,6,7,8
	DB	25,26,27,28,29,30,31,32
	DB	49,50,51,52,53,54,55,56
	DB	9,10,11,12,13,14,15,16
	DB	33,34,35,36,37,38,39,40
	DB	57,58,59,60,61,62,63,64
	DB	17,18,19,20,21,22,23,24
	DB	41,42,43,44,45,46,47,48
	ENDIF
;
	IF	MMDBL
SECTBL	DB	1,14,27,40,10,23,36,49,6,19,32,45,2,15,28,41
	DB	11,24,37,50,7,20,33,46,3,16,29,42,12,25,38,51
	DB	8,21,34,47,4,17,30,43,13,26,39,52,9,22,35,48
	DB	5,18,31,44
	ENDIF
;
GROUP	DB	0
DISP	DB	0
CURTRK	DB	0
CURSEC	DB	1
MAPSEC	DB	1
WRFLG	DB	0	;MAY NOT WRITE UNTIL '+', '-',
;			 OR 'G' COMMAND
	DS	60	;ROOM FOR STACK
STACK:	EQU	$
INBUF	DS	128
;
FCB	EQU	5CH
BDOS	EQU	5
RESETDK	EQU	13
SELDK	EQU	14
SEARCHF	EQU	17
; 
	END	100H
 
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