; DIRPAT v3.40 Copyright S. Kluger - ESKAY SOFTWARE
; All Rights Reserved
;
; A TurboDOS directory dump/patch utility
;
.z80
.request timedif
.request syslib			;use SYSLIB3 to assemble/link
;
cr	equ	0dh
lf	equ	0ah
dfcb	equ	5ch
dbuf	equ	80h		;default dma
;
curdk	equ	25		;return current disk
rrand	equ	33		;read random
wrand	equ	34		;write random
fsize	equ	35		;compute filesize
gtime	equ	105		;get time
parse	equ	152		;parse filename
;
tdos	equ	50h		;TD system call entry point
stabo	equ	8		;set abort address
fxmap	equ	11		;fix disk map
vers	equ	12		;version number
flush	equ	26		;flush disk buffers
lockd	equ	25		;lock drive function
fxdir	equ	42		;fix directory
;
; SYSLIB equates
;
	extrn	f$open,f$close,scanner
	extrn	print,cin,cout,phl4hc,eval16,eval10
	extrn	bbline,crlf,bdos,phlfdc,comphd,pa2hc
	extrn	fname,capin,pstr,condin,initfcb
;
	cseg
;
begin:	jr	..strt
;
cls:	db	1bh,'E',0,0,0,0		; clear screen
curpos:	db	1bh,'F',0,0,0,0		; cursor pos
xory:	db	0			; 0=xy, nz=yx
coffs:	db	32			; cursor offset
timeon:	db	0ffh			; time on/off flag
wyse:	db	0			; delay flag
;
..strt:	ld	sp,stack
	ld	c,stabo
	ld	de,abort
	call	tdos
	ld	c,gtime			; get time
	ld	de,datim
	call	bdos
	call	atoh
	ld	(sttime+6),hl
	ld	a,(mmm)
	call	atoh
	ld	(sttime+3),hl
	ld	a,(hhh)
	call	atoh
	ld	(sttime),hl
	ld	a,(5ch)
	ld	(dirfcb),a	; set drive
	or	a
	jr	nz,.ncd.
	ld	c,25
	call	bdos
	inc	a
.ncd.:	add	a,40h
	ld	(cdrv),a
	ld	(cdrv1),a
rstrt:	call	clrscr
	call	print
	db	9,9,'+------------------------------------+',cr,lf
	db	9,9,'| DIRPAT ver 3.40 01/23/86 (c) ESKAY |',cr,lf
	db	9,9,'|  TurboDOS directory patch utility  |',cr,lf
	db	9,9,'+------------------------------------+',cr,lf,lf,0
	xor	a
	ld	(frsttm),a
	ld	(wrtn),a
	ld	(hash),a
	ld	(force),a
	ld	(dfcb),a
	ld	l,a
	ld	h,a
	ld	(curs),hl
	ld	c,vers
	call	tdos		;get version number
	ld	a,c
	cp	13h
	call	z,unrel
	bit	7,b
	jp	z,noprv		;not privileged
	call	print
	db	'Do you wish to lock drive '
cdrv:	db	'A: (Y/N) ? [ ]',8,8,0
	ld	a,1
	call	bbline
	call	crlf
	ld	a,(hl)
	cp	'Y'
	ld	a,0
	jr	nz,nolock
	ld	c,curdk
	call	bdos
	ld	e,a
	ld	(curd),a
	ld	d,-1
	ld	c,lockd
	call	tdos		;lock this drive
	or	a
	jp	nz,busy
	ld	a,0ffh
nolock:	ld	(locked),a
	ld	de,dirfcb	;open directory file
	call	f$open
	or	a
	jp	nz,direrr
	ld	c,fsize
	call	bdos
	ld	hl,(rec)
	ld	(tots),hl
	call	fillbf
	ld	a,(dbuf+12)
	ld	(hash),a
	ld	bc,12*256+18
	call	gotoxy
	call	print
	'Press RETURN to display directory and begin',0
;
; This is the main command loop
;
cloop:	ld	hl,(curs)	;get current sector
	ld	(rec),hl	;stash it away
	ld	a,(frsttm)
	or	a
	ld	a,1
	ld	(frsttm),a
	ld	(dcall),a
	call	nz,dsply
	xor	a
	ld	(dcall),a
	ld	bc,16*256+20
	call	gotoxy
	call	print
	db	'Command (or ? for help) [ ]',8,8,0
.gtcc.:	ld	bc,16*256+45
	call	gotoxy
	call	condin			; see if input
	jr	nz,.gotc.		; yes, process it
	call	putt
	jr	.gtcc.
;
.gotc.:	cp	'a'
	jr	c,.nlcs.
	and	5fh
.nlcs.:	call	cout
	ld	hl,fcntbl
	ld	b,nmbfcn
.slfcn:	cp	(hl)
	inc	hl
	jr	z,.gofcn
	inc	hl
	inc	hl
	djnz	.slfcn
	cp	cr
	ld	a,7
	call	nz,cout
	jp	cloop
;
.gofcn:	ld	a,(hl)
	inc	hl
	ld	h,(hl)
	ld	l,a
	jp	(hl)
;
fcntbl:	db	'>'
	dw	nxtact
	db	'!'
	dw	home
	db	'?'
	dw	help
	db	'Q'
	dw	quit
	db	'+'
	dw	advanc
	db	'='
	dw	advanc
	db	'-'
	dw	decrem
	db	'A'
	dw	again
	db	'D'
	dw	drives
	db	'R'
	dw	fillb
	db	'W'
	dw	purgbf
	db	'G'
	dw	goto
	db	'H'
	dw	dohash
	db	'F'
	dw	find
	db	'L'
	dw	fasc
	db	'E'
	dw	erasef
	db	'U'
	dw	unera
	db	'S'
	dw	edit
	db	'X'
	dw	hextgl
nmbfcn	equ	($-fcntbl)/3
;
find:	ld	bc,16*256+20
	call	gotoxy
	call	print
	db	'   Enter hex to be found, RET to stop',cr,lf,0
	ld	de,tmpbf
	ld	b,0
fhl:	call	print
	db	cr,lf,'Hex : ',0
	ld	a,1
	call	bbline
	or	a
	jr	z,fhd
	push	de
	call	eval16
	ld	a,e
	pop	de
	ld	(de),a
	inc	de
	inc	b
	jr	fhl
;
fhd:	ld	a,b
	or	a
	jp	z,cloop
	ld	(vecl),a
	ld	hl,tmpbf
	ld	(vect),hl
	jr	fntry
;
fasc:	ld	bc,16*256+20
	call	gotoxy
	call	print
	db	'     Enter filename to be found : ',0
	ld	a,1
	call	bbline
	or	a
	jp	z,cloop
	cp	16
	jr	nc,fasc
	ld	de,dfcb		; parse filename
	call	fname
	jr	z,fasc
	ld	a,c		; get user number flag
	cp	0ffh		
	ld	a,'?'		; preload false
	jr	z,..fau.	; skip if no user number
	ld	a,c		; else get user #
..fau.:	ld	(de),a		; and store in fcb
	ld	hl,previ
	push	de
	ld	bc,12
	ex	de,hl
	ldir
	pop	de
..fa:	ld	(vect),de
	ld	a,12		; file name is 12 chars
	ld	(vecl),a
	ld	hl,(curs)
	ld	(temp),hl
	xor	a
fntry:	ld	(ascis),a
floop:	call	fillbf
nofas:	ld	a,(vecl)
	ld	c,a
	ld	hl,dbuf
	ld	de,(vect)
	ld	b,127
	call	scan
	jr	z,found
	ld	hl,(curs)	;get current sector
	inc	hl		;advance to next
	ld	de,(tots)	;get total sectors
	call	comphd		;check if we're at the end
	jr	z,notfd		;not found.
	ld	(curs),hl
	jr	floop
;
found:	ld	a,l
	and	7fh
	ld	(fbyt),a
	ld	a,1
	ld	(loctd),a
	ld	hl,(curs)
	jp	fillb
;
notfd:	call	print
	db	cr,lf,lf
	db	9,9,'*** end of file ***',cr,lf,7,0
	call	delay
	ld	hl,(temp)
	ld	(curs),hl
	call	fillbf
	jp	cloop
;
scan:	ld	a,(ascis)
	or	a
	jp	nz,scanner
	ld	hl,dbuf
..sl1:	res	7,(hl)
	inc	l
	jr	nz,..sl1
	ld	hl,dbuf
	ld	de,20h
	ld	bc,5ch
..sm1:	push	hl
	push	bc
..sm2:	ld	a,(bc)
	cp	'?'
	jr	z,..smw
	cp	(hl)
	jr	nz,..smn
..smw:	inc	hl
	inc	bc
	ld	a,68h
	cp	c
	jr	nz,..sm2
	pop	bc
	pop	hl
	ret
;
..smn:	pop	bc
	pop	hl
	add	hl,de
	ld	a,l
	or	a
	jr	nz,..sm1
	inc	a
	ret
;
home:	ld	de,0
	jp	secok
;
hextgl:	ld	a,(hexfl)
	cpl
	ld	(hexfl),a
	jp	cloop
;
; go to specified sector
;
goto:	ld	bc,23*256+0
	call	gotoxy
	call	print
	db	'Enter sector number to jump to (in decimal) : ',0
	call	bbline
	or	a
	jp	z,cloop
	ld	bc,20*256+0
	call	cleol
	ld	bc,23*256+0
	call	cleol
	call	eval10
	ld	hl,(tots)
	dec	hl
	call	comphd
	jr	nc,secok
	ld	bc,20*256+27
	call	gotoxy
	call	print
	db	'Sector number out of range',7,0
	jr	goto
;
secok:	dec	de
	ld	(curs),de
	jp	advanc
;
; display current sector
;
dsply:	ld	a,1
	ld	(dison),a
	call	clrscr
	call	print
	9,'Sec [',0
	ld	hl,(curs)
	call	prthl
	call	print
	']     Hash=O',0
	ld	a,(hash)
	or	a
	jr	nz,..hs.
	call	print
	'FF',0
	jr	..hx.
;
..hs.:	call	print
	'N',0
..hx.:	call	print
	'     Size ',0
	ld	hl,(tots)
	call	prthl
	call	print
	' sectors    ',0
	ld	a,(wrtn)
	or	a
	ld	a,' '
	jr	z,..nwr.
	ld	a,'W'
..nwr.:	call	cout
	ld	a,(locked)
	or	a
	ld	a,' '
	jr	z,..nlk.
	ld	a,'L'
..nlk.:	call	cout
	call	print
	db	' '
cdrv1:	db	'A:',0
	ld	hl,loctd
	ld	a,(hl)
	ld	(hl),0
	or	a
	jr	z,..nlcd
	call	print
	'    Found: byte ',0
	ld	a,(fbyt)
	call	pa2hc
	push	af
	and	0fh
	ld	b,a
	pop	af
	and	0f0h
	rra
	rra
	rra
	rra
	add	a,3
	ld	h,a
	ld	c,3
	ld	a,-3
.clh..:	add	a,c
	dec	b
	jp	p,.clh..
	add	a,6
	ld	l,a
	ld	(editpt),hl
	ld	a,1
	ld	(dcall),a
	call	..nlcd
	xor	a
	ld	(dcall),a
	jp	edlp

;
..nlcd:	ld	hl,dbuf		;hl=buffer pointer
	call	print
	db	cr,lf
	db	'ADDR  00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F'
	db	'  0123456789ABCDEF',cr,lf,0
lp10:	call	crlf
	push	hl
	res	7,l		;reset bit for display
	call	phl4hc		;print address
	pop	hl
	call	spc
	call	spc
	push	hl		;save for ascii display
lpln:	ld	a,(hl)
	call	pa2hc
	call	spc
	inc	l
	ld	a,l
	and	0fh		;done this line?
	jr	nz,lpln
	call	spc
	pop	hl		;back for ascii
asclp:	ld	a,(hl)
	and	7fh
	cp	7fh
	jr	z,noprc
	cp	' '
	jr	nc,prasc
noprc:	ld	a,'.'
prasc:	call	cout
	inc	l
	jr	z,ddone
	ld	a,l
	and	0fh
	jr	z,lp10
	jr	asclp
;	
spc:	ld	a,' '
	jp	cout
;
ddone:	call	crlf
	ld	a,(dcall)
	or	a
	ret	nz
	jp	cloop
;
decrem:	ld	hl,(curs)	;get current sector
	ld	a,h
	or	l
	dec	hl
	jr	nz,nonda	;skip if not at start
	ld	hl,(tots)	;get total sectors
	dec	hl		;minus 1 (0..end)
	jr	nonda
;
advanc:	ld	hl,(curs)	;get current sector
	inc	hl		;advance to next
	ld	de,(tots)	;get total sectors
	call	comphd		;check if we're at the end
	jr	nz,nonda	;skip if not at end
.wrp..:	ld	hl,0		;go to start (wrap around)
nonda:	ld	(curs),hl	;save new sector
fillb:	call	fillbf
	jp	cloop
;
; got to next active dir sector
;
nxtact:	ld	hl,(curs)
	inc	hl
	ld	de,(tots)
	call	comphd
	jr	z,.wrp..
	ld	(curs),hl
	call	fillbf		;get buffer
	ld	hl,80h
	ld	de,20h
	ld	b,4
..nx..:	ld	a,(hl)
	cp	0e5h
	jr	nz,fillb
	add	hl,de
	djnz	..nx..
	jr	nxtact
;
fillbf:	ld	hl,(curs)
	ld	(rec),hl
	ld	c,rrand
rdwr:	ld	de,dirfcb
	call	bdos
	or	a
	ret	z
	call	print
	db	cr,lf,lf,7
	db	'Read/write error code ',0
	call	pa2hc
	call	print
	db	'.',cr,lf,'Ignoring error.',cr,lf,0
	jp	delay
;
purgbf:	ld	a,(locked)
	or	a
	jr	nz,purg1
	ld	bc,23*256+10
	call	gotoxy
	call	print
	db	7,'WARNING - DRIVE NOT LOCKED - PROCEED (Y/N) ? ',0
	ld	a,1
	call	bbline
	ld	bc,23*256+0
	call	cleol
	ld	a,(hl)
	cp	'Y'
	jr	z,purg1
	jp	cloop
;
purg1:	ld	hl,(curs)
	ld	(rec),hl
	ld	c,wrand
	call	rdwr
	ld	a,1
	ld	(wrtn),a
	jp	cloop
;
dohash:	ld	hl,0
	ld	(curs),hl
	call	fillbf
	ld	bc,23*256+10
	call	gotoxy
	call	print
	db	'Hash directory after exiting (Y=YES) ? ',0
	ld	a,1
	ld	(force),a
	call	bbline
	ld	bc,23*256+0
	call	cleol
	ld	a,(hl)
	cp	'Y'
	ld	a,80h
	jr	z,yhash
	xor	a
yhash:	ld	(dbuf+0ch),a
	ld	(hash),a
	jp	purgbf
;
; delete all directory entries of a file
; (unless already deleted)
; report count
;
erasef:	call	print
	db	cr,lf,lf
	db	'Enter filename (no user # = all entries,',cr,lf
	db	'else only entries in that user) RET=quit : ',0
	ld	a,0e5h
	ld	(eracmd),a
	ld	a,1
	call	bbline
	or	a
	jp	z,cloop
	ld	(pfcb),hl		;save hl
	ld	hl,sfcb
	ld	(pfcb+2),hl
	ld	c,parse
	ld	de,pfcb
	call	bdos
	ld	a,(sfcb+15)
	or	a
	jr	z,nofu
	ld	a,(sfcb+13)
	inc	a
nofu:	dec	a
	ld	(sfcb),a
	inc	a
	jp	nz,noall
	call	print
	db	cr,lf
	db	'WARNING - you are about to delete ALL those',cr,lf
	db	'directory entries. Say "NO" to change your mind : ',0
	ld	a,1
	call	bbline
	ld	a,(hl)
	cp	'N'
	jp	z,cloop
noall:	ld	hl,0
	ld	(curs),hl		;set current sector to 0
erasl:	call	fillbf			;get buffer
	ld	ix,dbuf			;ix=pointer to buffer
	ld	de,32			;de=increment count
	ld	c,4			;c=field counter
	xor	a
	ld	(noche),a		;set no change erase flag
erasl1:	ld	hl,sfcb			;hl=fcb ptr
	ld	b,12			;b=byte counter
	push	ix			;move ix...
	pop	iy			;...to iy
	ld	a,(hl)
	inc	a
	jr	nz,erasl2
	inc	ix
	inc	hl
	dec	b
erasl2:	ld	a,'?'
	cp	(hl)
	jr	z,..qmk
	ld	a,(ix+0)
	and	7fh
	cp	(hl)
	jr	nz,eranxt
..qmk:	inc	ix
	inc	hl
	djnz	erasl2
	ld	a,(eracmd)		; get erase/unerase byte
	ld	(iy+0),a
	ld	a,0ffh
	ld	(noche),a
eranxt:	dec	c
	jr	z,eradun
	push	iy
	pop	ix
	add	ix,de
	jr	erasl1
;
eradun:	ld	hl,(curs)
	ld	(rec),hl
	ld	c,wrand
	ld	a,(noche)
	or	a
	jr	z,nowrt
	ld	(dcall),a
	call	dsply
	ld	a,(eracmd)
	cp	0e5h
	jr	z,..due
	call	print
	cr,lf
	'UN-DELETE FILE(S) above? ',0
	ld	a,1
	call	bbline
	or	a
	jr	z,nowrt
	ld	a,(hl)
	cp	'Y'
	jr	nz,nowrt
..due:	xor	a
	ld	(dcall),a
	call	rdwr
nowrt:	ld	a,1
	ld	(wrtn),a
	ld	hl,(curs)	;get current sector
	inc	hl		;advance to next
	ld	(curs),hl
	ld	de,(tots)	;get total sectors
	call	comphd		;check if we're at the end
	jp	z,cloop
	jp	erasl
;
unera:	ld	c,32
	ld	e,0ffh
	call	bdos
	ld	(eracmd),a	; current user #
	ld	a,(locked)
	or	a
	jr	nz,..unel
	call	print
	cr,lf,lf,7
	'WARNING: drive is not locked - proceed anyway? ',0
	ld	a,1
	call	bbline
	or	a
	jp	z,cloop
	ld	a,(hl)
	cp	'Y'
	jp	nz,cloop
..unel:	call	print
	cr,lf,lf
	'File will be undeleted to current user area. NOTE that multiple',cr,lf
	'occurrences of the same filename can ALSO be unerased causing',cr,lf
	'garbled information.',cr,lf
	'Enter name of file to be undeleted (RET=quit) : ',0
	ld	a,1
	call	bbline
	or	a
	jp	z,cloop
	ld	(pfcb),hl
	ld	hl,sfcb
	ld	(pfcb+2),hl
	ld	c,parse
	ld	de,pfcb
	call	bdos
	ld	hl,sfcb
	ld	(hl),65h		; E5 and 7F
	inc	hl
	ld	a,'?'
	ld	b,11
..xxx:	cp	(hl)
	jp	nz,noall
	inc	hl
	djnz	..xxx
	call	print
	cr,lf,7
	'ERROR: cannot undelete *.*!',cr,lf,0
	call	delay
	jp	cloop
;
help:	call	clrscr
	call	print
	db	cr,lf
	db	'DIRPAT COMMANDS (single commands only, no stacking) :'
	db	cr,lf,lf
	db	'!  =  HOME (go to sector 0)',cr,lf
	db	'?  =  this message',cr,lf
	db	'D  =  change logged drive',cr,lf
	db	'E  =  delete (Erase) all entries of one file',cr,lf
	db	'F  =  find hex data in directory',cr,lf
	db	'G  =  goto record (prompting for decimal number)',cr,lf
	db	'H  =  set hashed status (effective after exit)',cr,lf
	db	'L  =  locate a file name',cr,lf
	db	'Q  =  quit to TurboDOS',cr,lf
	db	'R  =  re-read current record and display',cr,lf
	db	'S  =  substitute onscreen (hex/ASCII edit)',cr,lf
	db	'U  =  UNDELETE a deleted file',cr,lf
	db	'W  =  write current record',cr,lf
	db	'X  =  toggle hex/decimal sector DISPLAY',cr,lf
	db	'+  =  advance pointer to next record and display',cr,lf
	db	'-  =  move pointer to previous record and display',cr,lf,lf
	db	'Use this program with extreme caution!',cr,lf,lf
	db	'----> press any key to continue <----',0
	call	cin
	call	clrscr
	jp	cloop
;
prthl:	ld	a,(hexfl)
	or	a
	jp	z,phl4hc
	jp	phlfdc
;
busy:	call	print
	db	cr,lf,lf,7
	db	'ERROR - cannot lock drive. Cause all other users to',cr,lf
	db	'log off and try again',cr,lf,0
	rst	0
;
direrr:	call	print
	db	cr,lf,lf,lf
	db	'FATAL ERROR - $.DIR NOT FOUND.',cr,lf
	db	'Are you not running under TurboDOS?',cr,lf,lf,0
quit:	ld	de,dirfcb
	call	f$close
	ld	a,(wrtn)
	or	a
	jr	nz,fixit
	jp	noth
;
fixit:	ld	a,(locked)
	or	a
	jr	nz,fixok
	call	print
	db	cr,lf,lf
	db	9,'WARNING - UNABLE TO FIX UNLOCKED DRIVE',cr,lf
	db	9,'YOU MUST RUN FIXMAP AND FIXDIR MANUALLY',7,cr,lf,lf,0
	jp	noth
;
fixok:	call	print
	db	cr,lf
	db	'Now rebuilding disk map - stand by',0
	ld	a,(curd)	;get current disk
	ld	e,a
	ld	c,fxmap
	call	tdos
	or	a
	jp	nz,nofm		;error...
	ld	a,(force)
	or	a
	jr	nz,forcef
	ld	a,(hash)
	or	a
	jr	z,noth
forcef:	call	print
	db	cr,lf
	db	'Now reorganizing directory - DO NOT ABORT',cr,lf,lf,0
	ld	a,(curd)
	ld	e,a
	ld	c,fxdir
	call	tdos
	or	a
	jp	nz,nofd
noth:	call	print
	db	cr,lf,lf
	9,9,'   Time spent in DIRPAT: ',0
	ld	c,gtime
	ld	de,datim
	call	bdos
	call	atoh
	ld	(entime+6),hl
	ld	a,(mmm)
	call	atoh
	ld	(entime+3),hl
	ld	a,(hhh)
	call	atoh
	ld	(entime),hl
	call	timdif##
	ld	hl,elaptm
	call	pstr
	call	print
	cr,lf,lf
	9,'     Thanks for using DIRPAT, an ESKAY product',cr,lf,lf,0
	ld	c,lockd		;unlock drive
	ld	d,0
	ld	a,(curd)
	ld	e,a
	call	tdos
	ld	c,flush		;flush buffers
	ld	a,(curd)
	ld	e,a
	ld	d,80h
	call	tdos
	rst	0
;
nofd:	call	print
	db	cr,lf,lf,7
	db	'ERROR - cannot reorganize directory, aborting',cr,lf,0
	rst	0
;
nofm:	call	print
	db	cr,lf,lf,7
	db	'ERROR - cannot fix disk map, aborting.',cr,lf,0
	rst	0
;
noprv:	call	print
	db	cr,lf,lf,7
	db	'Not authorized to use DIRPAT',cr,lf,0
	rst	0
;
unrel:	push	psw
	call	print
	db	cr,lf,7
	db	'NOTE: Operation under TurboDOS 1.3 has not been fully',cr,lf
	db	'tested. Directory size is reported as 0 and system may',cr,lf
	db	'crash on exit. Proceed at your own risk.',cr,lf,lf,0
	pop	psw
abort:	ret
;
delay:	push	bc
	ld	a,10
	ld	bc,0
....d.:	dec	c
	push	hl
	pop	hl
	jr	nz,....d.
	djnz	....d.
	dec	a
	jr	nz,....d.
	pop	bc
	ret
;
delay1:	ld	a,(wyse)
	or	a
	ret	z
	push	bc
	ld	bc,1000
...d1.:	dec	c
	jr	nz,...d1.
	djnz	...d1.
	pop	bc
	ret
;
; a to h
;
atoh:	push	af
	ld	hl,3030h
	and	0fh
	or	h
	ld	h,a
	pop	af
	and	0f0h
	rra
	rra
	rra
	rra
	or	l
	ld	l,a
	ret
;
ahlo:	call	atoh
	ld	a,l
	call	cout
	ld	a,h
	jp	cout
;
; edit command
;
edit:	ld	a,(dison)
	dec	a
	jr	z,.eact.
	ld	a,7
	call	cout
	jp	cloop
;
.eact.:	ld	bc,3*256+6		; beginning of field
	ld	(editpt),bc
edlp:	ld	bc,(editpt)
	call	gotoxy
	xor	a
	ld	(frsttm),a
	call	condin
	jr	nz,.char.
	call	putt
	jr	edlp
;
.char.:	cp	'a'
	jr	c,..nl..
	and	5fh
..nl..:	cp	3			; exit
	jp	z,cloop
	cp	'E'-40h			; ^E = up
	jr	z,.edup.
	cp	'X'-40h			; ^X = down
	jr	z,.eddn.
	cp	'S'-40h			; ^S = left
	jr	z,.edlf.
	cp	'D'-40h			; ^D = right
	jr	z,.edrt.
	cp	27h			; check '
	jp	z,.edasc		; edit ascii
	call	nybble			; see if nybble
	jp	nc,.edda.		; it is, edit data
	ld	a,7
	call	cout
	jr	edlp
;
.edup.:	ld	a,(editpt+1)		; get row
	dec	a
	cp	2
	jr	nz,.esnt.
	ld	a,10			; set bottom
.esnt.:	ld	(editpt+1),a
	jr	edlp
;
.eddn.:	ld	a,(editpt+1)
	inc	a
	cp	11
	jr	nz,.esnt.
	ld	a,3
	jr	.esnt.
;
.edlf.:	ld	a,(editpt)
	sub	3
	cp	3
	jr	nz,.eslt.
	ld	a,51
	ld	(editpt),a
	jr	.edup.
;
.eslt.:	ld	(editpt),a
	jp	edlp
;
.edrt.:	ld	a,(editpt)
	add	a,3
	cp	54
	jr	nz,.eslt.
	ld	a,6
	ld	(editpt),a
	jr	.eddn.
;
.edasc:	call	cin			; get ascii character
	call	pa2hc
	jr	..asci
;
.edda.:	call	hexo			; display high nybble
	cp	'A'
	jr	c,...x
	sub	7
...x:	and	0fh
	rla
	rla
	rla
	rla
	ld	b,a			; save it
.ede..:	call	capin
	call	nybble
	jr	c,.ede..
	call	hexo
	cp	'A'
	jr	c,...y
	sub	7
...y:	and	0fh
	or	b			; a has byte now
..asci:	push	af
	call	calcbp			; calculate buffer pointer
	pop	af
	ld	(hl),a
	ld	a,l
	and	0fh
	add	a,55
	ld	bc,(editpt)
	ld	c,a
	call	gotoxy
	ld	a,(hl)
	and	7fh
	cp	7fh
	jr	z,.ed...
	cp	' '
	jr	nc,.edn..
	cp	7fh
.ed...:	ld	a,'.'
.edn..:	call	cout
	jp	.edrt.			; go to next hex on same line
;
; calculate buffer from screen address
;
calcbp:	ld	hl,(editpt)
	ld	a,l			; get column
	ld	b,0
	sub	6
.div3.:	inc	b
	sub	3
	jr	nc,.div3.
	ld	l,b
	ld	a,h
	ld	h,0
	sub	3
	rla
	rla
	rla
	rla
	add	a,7fh
	add	a,l
	ld	l,a
	ret
;
; test a if valid nybble
;
nybble:	cp	'0'
	ret	c
	cp	'F'+1
	ccf
	ret	c
	cp	'9'+1
	ccf
	ret	nc
	sub	7
	cp	'9'+1
	ret
;
; hex out
;
hexo:	cp	'9'+1
	jp	c,cout
	add	a,7
	jp	cout
;
; position cursor. b=x, c=y
;
gotoxy:	push	hl
	ld	hl,curpos
	call	pstrg
	ld	a,(xory)		; check xy or yx
	or	a			; if zero, then xy
	jr	z,..xy
	ld	a,b
	ld	b,c
	ld	c,a			; exchange b and c
..xy:	call	delay1
	ld	a,(coffs)		; get cursor offset
	push	af			; save for next
	add	a,b
	call	cout
	call	delay1
	pop	af
	add	a,c
	call	cout
	pop	hl
	ret
;
cleol:	push	hl
	call	gotoxy
	ld	b,79
	ld	a,' '
..ceol:	call	cout
	djnz	..ceol
	pop	hl
	ret
;
clrscr:	push	hl
	ld	hl,cls
	call	pstrg
	pop	hl
	ret
;
pstrg:	ld	a,(hl)
	or	a
	ret	z
	call	cout
	inc	hl
	jr	pstrg
;
putt:	ld	a,(timeon)
	or	a
	ret	z
	ld	c,gtime
	ld	de,datim
	call	bdos
	ld	b,a
	ld	a,(lsec)
	cp	b
	ret	z
	ld	a,b
	ld	(lsec),a
	ld	bc,16*256+0
	call	gotoxy
	ld	a,(hhh)
	call	ahlo
	ld	a,':'
	call	cout
	ld	a,(mmm)
	call	ahlo
	ld	a,':'
	call	cout
	ld	a,(lsec)
	jp	ahlo
;
; select new drive
;
drives:	call	clrscr
	call	print
	db	cr,lf,lf
	db	'Enter new drive (A..P, any other = no change) :',0
	call	capin
	cp	'A'
	jp	c,cloop
	cp	'Q'
	jp	nc,cloop
	ld	(cdrv),a
	ld	(cdrv1),a
	push	af
	ld	de,dirfcb
	call	f$close
	call	initfcb
	pop	af
	sub	40h
	ld	(dirfcb),a
	jp	rstrt
;
; find again (repeat "l" command)
;
again:	ld	hl,previ
	ld	a,(hl)
	inc	a
	jp	z,cloop		; ignore if no previous fn
	ex	de,hl
	jp	..fa
;
	dseg
;
editpt:	dw	0
;
sttime::db	'00:00:00'
entime::db	'00:00:00'
elaptm::db	'00:00:00',0
dison:	db	0
frsttm:	db	0
locked:	db	0		;0=drive not locked
noche:	db	0		;no change (erase)
dcall:	db	0		;NZ=dsply called, else JMPed
curs:	dw	0		;current sector
tots:	dw	0		;total number of sectors
eracmd:	db	0		;E5 if erase, user # if unera
temp:	dw	0
vect:	dw	0
vecl:	db	0
ascis:	db	0		;0=ascii search, nz=binary
wrtn:	db	0		;0=no changes made, else changes were made
hash:	db	0		;0=linear, 1=hashed
curd:	db	0		;current drive
lsec:	db	0
hexfl:	db	0
loctd:	db	0
fbyt:	db	0
force:	db	0		;force fixdir
dirfcb:	db	0,'$       DIR',0
	db	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
rec:	db	0,0,0
sfcb:	ds	36
pfcb:	ds	4
tmpbf:	ds	64		;temp buffer space
;
previ:	db	0ffh
	ds	11
;
datim:	dw	0
hhh:	db	0
mmm:	db	0
;
	ds	80
stack	equ	$
	end

	jp	rstrt
;
; find again (repeat "l" command)
;