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A2osX/ProDOS.FX/ProDOS.S.XDOS.A.txt
Rémy GIBERT e753621178 Kernel 0.93+
2019-11-11 15:21:06 +01:00

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NEW
AUTO 3,1
*--------------------------------------
XDOS.START
XDOS.MLI cld no decimal.
pla get processor status
sta spare1 save it temporarily
sty mliy save x and y
stx mlix
pla find out the address of the caller
sta A3L
clc preserve the address of the call spec.
adc #$04
sta mliretn last MLI call return address
pla
sta A3L+1
adc #$00
sta mliretn+1
lda spare1
pha pull processor status
plp to re-enable interrupts.
cld still no decimal
stz p8error clear any previous errors.
ldy #$01 find out if command is valid.
lda (A3L),y get command #
lsr and hash it to a range of 0-$1F
lsr
lsr
lsr
clc
adc (A3L),y
and #$1F
tax
lda (A3L),y check result to see if valid command #
cmp scnums,x
bne scnerr
iny index to call spec parm list.
lda (A3L),y make A3L point to parameter count byte
pha in parameter block.
iny
lda (A3L),y
sta A3L+1
pla
sta A3L
* ldy #$00
lda pcntbl,x make sure parameter list has the correct # of parameters.
beq goclock clock has 0 parameters.
cmp (A3L) ,y
bne scperr error if wrong count.
lda scnums,x get call # again
cmp #MLIQUIT is it quit?
beq special if so, then call quit dispatcher
asl carry set if bfm or dev mgr
bpl godevmgr
bcs gobfmgr
lsr shift back down for interrupt manager
and #$03 valid calls are 0 and 1
jsr XDOS.intmgr
bra exitmli
special jmp jspare P8 system death vector
goclock jsr clockv go read clock.
bra exitmli no errors possible
godevmgr lsr shift back down for device manager.
adc #$01 valid commands are 1 and 2.
sta A4L save command #.
jsr XDOS.devmgr execute read or write request.
bra exitmli
gobfmgr lsr shift back down for block file manager.
and #$1F valid commands are 0-$13
tax
jsr XDOS.bfmgr
exitmli stz bubit clear backup bit
ldy p8error P8 error code
cpy #$01 if > 0 then set carry
tya and set z flag.
php disable interrupts until exit complete.
sei
lsr mliact indicate MLI done.
plx save status register until return.
lda mliretn+1 place last MLI call return address
pha on stack. return is done via 'rti'
lda mliretn so the status register is restored
pha at the same time, so
phx place status back on stack
tya return error, if any.
ldx mlix MLI X register savearea
ldy mliy MLI Y register savearea
pha
lda bnkbyt1 restore language card status
jmp GP.MLIEXIT and return.
nodevice lda #MLI.E.NODEV no device connected.
jsr GP.P8errv
scnerr lda #MLI.E.BADCALL
.HS 2C BIT ABS
scperr lda #MLI.E.BADCNT
jsr gosyserr
bra exitmli
*--------------------------------------
* ProDOS Device Manager
*--------------------------------------
XDOS.devmgr php do not allow interrupts.
sei the call spec for devices must
ldy #$05
.1 lda (A3L),y be passed to drivers in page zero:
sta A4L,y
dey
bne .1
ldx buf+1 buffer page
stx usrbuf+1 to user buffer
inx
inx
lda buf is buffer page aligned (nn00) ?
beq .2 branch if it is
inx else account for 3-page straddle
.2 jsr vldbuf1 make sure user buffer is not
bcs dvmgrerr conflicting with protected ram.
jsr dmgr call internal entry for device dispatch
bcs dvmgrerr branch if error
plp
clc no error
rts
dvmgrerr plp restore interrupt status
gosyserr jsr GP.P8errv
*--------------------------------------
dmgr lda unitnum get device # and
and #$F0 strip misc lower nibble
sta unitnum then save it.
lsr use as index to device table
lsr
lsr
tax
gocmd jmp (DEVPTRS,x) goto driver (or error if no driver)
*--------------------------------------
* ProDOS interrupt manager
*--------------------------------------
XDOS.intmgr sta A4L interrupt command
lsr allocate interrupt or deallocate?
bcs dealcint branch if deallocate.
ldx #$03 test for a free interrupt space in tbl.
.1 lda inttbl-2,x test high address for 0.
bne .2 branch if spot occupied.
ldy #$03 get address of routine.
lda (A3L),y must not be zero page.
beq badint error if it is.
sta inttbl-2,x save high address
dey
lda (A3L),y
sta inttbl-3,x and low address.
txa return interrupt # in range 1-4
lsr
dey
sta (A3L),y pass back to user.
clc no errors.
rts
.2 inx
inx next lower priority spot
cpx #$0B are all 4 already allocated?
bne .1 branch if not.
lda #MLI.E.IRQFULL interrupt table full
.HS 2C BIT ABS
badint lda #MLI.E.INVPARAM invalid parameter.
jsr GP.P8errv
dealcint ldy #$01 zero out interrupt vector
lda (A3L),y but make sure it is a valid #.
beq badint error if < 1
cmp #$05 or > 4
bcs badint
asl
tax
lda #$00 now clear it
sta inttbl-2,x
sta inttbl-1,x
clc
rts
*--------------------------------------
XDOS.syserr sta p8error P8 error code
plx
plx pop 1 level of return
sec
rts
*--------------------------------------
sysdeath1 tax death error code.
sta CLR80DISP disable 80 col hardware.
lda SETTEXT switch in text.
lda cortflag is this a Cortland?
beq .1 if not, don't use super hires switch.
stz newvideo force off super hires.
.1 lda CLRPAGE2 switch in text page 1.
ldy #deathmsg.LEN-1
.2 lda deathmsg,y
sta $400,y 'RESTART SYSTEM-$'
dey
bpl .2
txa x = death error code
and #$0F convert to ascii
ora #$30
cmp #$3A
bcc .3 branch if not > 9.
adc #$06 inc to alpha a-f
.3 ldy #deathmsg.LEN
sta $400,y
lda #' '
.4 iny
sta $400,y
cpy #39
bne .4
bra *
*--------------------------------------
* ProDOS Block File Manager
*--------------------------------------
XDOS.bfmgr lda disptch,x translate into command address.
asl bit 7 indicates pathname to process
sta cmdtemp
and #$3F bit 6 is refnum, 5 is time to process
tax
lda cmdtable,x move address to indirect jump
sta H3274+1
lda cmdtable+1,x high byte
sta H3274+2
lda #$20 init backup bit flag
sta bkbitflg to say 'file modified'
bcc nopath
jsr XDOS.GetPath process pathname before calling command
bcs errorsys branch if bad name.
nopath asl cmdtemp test for refnum processing
bcc nopreref
jsr findfcb set pointers to fcb and vcb of file
bcs errorsys
nopreref asl cmdtemp check for necessity of time stamp
bcc H3274
jsr clockv date/time
H3274 jsr $FFFF SELF MODIFIED : execute command
bcc goodop
errorsys jsr GP.P8errv
goodop rts
*--------------------------------------
* entry used by rename for 2nd pathname.
*--------------------------------------
XDOS.GetRenPath ldy #$03 get address to new pathname
.HS 2C
*--------------------------------------
XDOS.GetPath ldy #$01 index to pathname pointer
lda (A3L),y low pointer address
sta zpt
iny
lda (A3L),y hi pointer address
sta zpt+1
ldx #$00 x = index to pathbuf
ldy #$00 y = index to input pathname.
stz prfxflg assume prefix is in use.
stz pathbuf mark pathbuf = nothing processed.
lda (zpt),y validate pathname length > 0 and < 65
beq errsyn
cmp #$41
bcs errsyn
sta pathcnt this is used to compare for
inc pathcnt end of pathname processing.
iny now check for full pathname...
lda (zpt),y (full name if starts with '/')
and #$7F
cmp #'/'
bne H32AD branch if prefix appended.
dec prfxflg set prefix flag = prefix not used.
iny index to 1st character of pathname.
H32AD lda #$FF set current position of pathbuf
sta pathbuf,x to indicate end of pathname.
sta namcnt $FF = no chars processed in local name.
stx namptr pointer to local name length byte.
H32B8 cpy pathcnt done with pathname processing?
bcs endpath
lda (zpt),y get character
and #$7F
inx prepare for next char
iny
cmp #'/' is it delimiter '/' ?
beq endname yes
.DO LOWERCASE=0
cmp #'a' lowercase?
bcc .1 no
and #$5F shift to uppercase
.1 .FIN
sta pathbuf,x store char
inc namcnt is it the 1st char of a local name?
bne .2 no
inc namcnt increment to 1
jsr XDOS.IsValidFirstChar
bcc H32B8
bra errsyn
.2 jsr XDOS.IsValidChar
bcc H32B8
errsyn lda #MLI.E.INVPATH
sec
rts
endpath lda #$00 end pathname with a 0
bit namcnt also make sure count is positive
bpl H32FD
sta namcnt
dex
H32FD inx
sta pathbuf,x
beq errsyn error if '/' only.
stx pathcnt save length of pathname
tax
endname lda namcnt validate local name < 16
cmp #16
bcs errsyn
phx save pointer
ldx namptr get index to beginning of local name
sta pathbuf,x save local name's length
plx restore pointer
bne H32AD branch if more names to process
clc probably no error, but
lda prfxflg make sure all pathnames are prefixed
bne H3323 or begin with a '/'.
lda newpfxptr must be non-zero
beq errsyn
H3323 rts
*--------------------------------------
XDOS.SetPrefix jsr XDOS.GetPath call is made to detect if a null path.
bcc H3333 path ok.
ldy pathbuf is it a null pathname?
bne pfxerr error if not
sty newpfxptr fix appletalk PFI bug
sty preflag prefix flag
clc no error
rts
H3333 jsr findfile go find specified prefix directory.
bcc H333C if no error.
cmp #MLI.E.INVPATH bad pathname.
bne pfxerr branch if error is not root directory.
H333C lda d_stor make sure last local name is dir type
and #$D0 (either root or sub).
eor #$D0 directory?
bne ptyperr wrong type
ldy prfxflg new or appended prefix?
bne H334D
lda newpfxptr append new prefix to old
H334D tay
sec find new beginning of prefix
sbc pathcnt
cmp #$C0 too long?
bcc errsyn then error
tax
sta newpfxptr
sta preflag
lda d_dev save device #
sta p_dev
lda d_frst and address of 1st block
sta p_blok
lda d_frst+1
sta p_blok+1
movprfx lda pathbuf,y
sta pathbuf,x
iny
inx
bne movprfx
clc good prefix
rts
ptyperr lda #$4B filetype error (not a directory)
pfxerr sec
rts
*--------------------------------------
XDOS.GetPrefix clc calc how big a buffer is needed.
ldy #$01 get index to users pathname buffer
lda (A3L),y
sta usrbuf user buffer ptr
iny
lda (A3L),y
sta usrbuf+1
stz cbytes+1 set buffer length at 64 char max
lda #$40
sta cbytes
jsr valdbuf go validate prefix buffer address
bcs pfxerr
ldy #$00 y = indirect index to user buffer.
lda newpfxptr get address of beginning of prefix
tax
beq nulprfx if null prefix.
eor #$FF get total length of prefix
adc #$02 add 2 for leading and trailing slashes.
nulprfx sta (usrbuf),y store length in user's buffer.
beq gotprfx branch if null prefix.
sendprfx iny inc to next user buffer location.
lda pathbuf,x get next char of prefix.
sndlimit sta (usrbuf),y give char to user.
and #$F0 check for length descriptor.
bne H33B3 branch if regular character
lda #$2F otherwise, substitute a slash.
bne sndlimit branch always
H33B3 inx
bne sendprfx branch if more to send.
iny
lda #$2F end with '/'
sta (usrbuf),y
gotprfx clc no error
rts
findfcb ldy #$01 index to ref#
lda (A3L),y is it a valid file# ?
beq badref must not be 0.
cmp #$09 must be 1 to 8 only.
bcs badref
pha
dec
lsr
ror
ror
ror multiply by 32.
sta fcbptr used as an index to fcb
tay
pla restore ref# in acc
cmp fcbbuf,y
bne errnoref
fndfcbuf lda fcbbuf+11,y get page address of file buffer.
jsr getbufadr get file's address into bufaddrl,h
ldx bufaddrh (y=fcbptr preserved)
beq fcbdead fcb corrupted
stx datptr+1 save ptr to data area of buffer
inx
inx index block always 2 pages after data
stx zpt+1
lda fcbbuf+1,y also set up device #
sta devnum
lda bufaddrl
sta datptr index and data buffers always on
sta zpt page boundaries.
fndfvol tax search for associated vcb
lda vcbbuf+16,x
cmp fcbbuf+1,y is this vcb the same device?
beq tstvopen if it is, make sure volume is active.
nxtfvol txa adjust index to next vcb.
clc
adc #$20
bcc fndfvol loop until volume found.
lda #$0A open file has no volume so
.HS 2C BIT ABS
fcbdead lda #$0B fcb error so
jsr sysdeath kill the system.
tstvopen lda vcbbuf,x make sure this vcb is open.
beq nxtfvol branch if it is not active.
stx vcbptr save ptr to good vcb.
clc no error
rts
errnoref lda #$00 put a zero into this fcb to
sta fcbbuf,y show free fcb.
badref lda #MLI.E.BADREF requested refnum is
sec illegal (out of range)
rts
*--------------------------------------
XDOS.Online jsr mvdbufr figure out how big buffer has to be.
stz cbytes set this for valdbuf routine.
stz cbytes+1
ldy #$01
lda (A3L),y if 0 then cbytes=$100 else $010 for one
and #$F0 device. mask out unused nibble.
sta devnum last device used.
beq H343C branch if all devices.
lda #$10 cbytes = $010
sta cbytes
bne H343F always taken
H343C inc cbytes+1 cbytes = $100
H343F jsr valdbuf go validate buffer range against
bcs onlinerr allocated memory.
lda #$00 zero out user buffer space
ldy cbytes
H3449 dey
sta (usrbuf),y
bne H3449
sta namptr used as pointer to user buffer.
lda devnum get device # again.
bne online1 branch if only 1 device to process.
jsr mvdevnums get list of currently recognized dev's.
H3459 phx save index to last item on list
lda loklst,x
sta devnum save desired device to look at.
jsr online1 log this volume and return it's name.
lda namptr inc pointer for next device
clc
adc #$10
sta namptr
plx get index to device list.
dex next device.
bpl H3459 branch if there is another device.
lda #$00 no errors for multiple on-line
clc
onlinerr rts
*--------------------------------------
online1 jsr fnddvcb see if it has already been logged in.
bcs olinerr1 branch if vcb is full.
ldx #$00 read in root (volume) directory
lda #$02
jsr rdblk read it into general purpose buffer.
ldx vcbptr index to the vcb entry.
bcc volfound branch if read was ok.
tay error value.
lda vcbbuf+17,x don't take the vcb offline if
bne rtrnerr there are active files present.
sta vcbbuf,x now take the volume offline
sta vcbbuf+16,x
rtrnerr tya error value.
bcs olinerr1 branch if unable to read.
volfound lda vcbbuf,x has it been logged in before?
beq H349E if not.
lda vcbbuf+17,x it has, are there active files?
bmi H34AA branch if volume is currently busy.
H349E jsr logvcb1 go log it in.
bcs olinerr1 branch if there is a problem.
lda #$57 anticipate a duplicate active volume
bit duplflag exits.
bmi olinerr1 branch if so.
H34AA ldx vcbptr
jsr cmpvcb does vol read compare with logged vol?
lda #$2E anticipate wrong volume mounted.
bcc H34D0 branch if ok.
olinerr1 pha save error code.
jsr svdevn report what device has problem.
pla error code.
iny tell what error was encountered.
sta (usrbuf),y
cmp #$57 duplicate volume error?
bne H34CE no.
iny report which other device has same name
ldx vcbentry
lda vcbbuf+16,x
sta (usrbuf),y
stz duplflag clear duplicate flag.
lda #$57 duplicate volume error code.
H34CE sec flag error
rts
H34D0 lda vcbbuf,x get volume name count
sta namcnt
ldy namptr index to user's buffer.
H34D9 lda vcbbuf,x move name to user's buffer
sta (usrbuf),y
inx
iny
dec namcnt
bpl H34D9
svdevn ldy namptr index to 1st byte of this entry.
lda devnum upper nibble = device# and
ora (usrbuf),y lower nibble = name length.
sta (usrbuf),y
clc no errors
rts end of block file manager
*--------------------------------------
XDOS.Create jsr lookfile check for duplicate, get free entry
bcc duperr error code may be 'file not found'
tstfnf cmp #MLI.E.FNOTFND 'file not found' is ok
bne crerr1 otherwise exit with error.
ldy #$07 test for tree or directory file,
lda (A3L),y no other kinds are legal.
cmp #$04 is it seed, sapling or tree?
bcc tstdspc branch if it is
cmp #$0D
bne ctyperr report type error if not directory.
tstdspc lda devnum make sure destination device
jsr twrprot1 is not write protected.
bcs H351D
lda nofree is there space in directory to
beq xtndir add this file? branch if not
jmp creat1 otherwise, go create file.
xtndir lda own_blk before extending directory,
ora own_blk+1 make sure it's a subdirectory.
bne H352A
lda #MLI.E.DIRFULL otherwise, directory full error
.HS 2C BIT ABS
ctyperr lda #MLI.E.UNSUPST filetype error
.HS 2C BIT ABS
duperr lda #MLI.E.DUPFILE name already exists
crerr1 sec
H351D rts
H352A lda bloknml preserve disk address of current (last)
pha directory link, before allocating an
lda bloknml+1 extended block.
pha
jsr alc1blk allocate a block for extending directory
plx
stx bloknml+1 restore block addr of dir info in gbuf
plx
stx bloknml
bcs H351D unable to allocate.
sta gbuf+2 save block address in y,a to
sty gbuf+3 current directory.
jsr wrtgbuf update directory block with new link.
bcs H351D if error
ldx #$01
swpbloks lda bloknml,x prepare new directory block
sta gbuf,x using current block as back link
lda gbuf+2,x
sta bloknml,x and save new block as next to be written
dex
bpl swpbloks
inx
txa x and a = 0
clrdir sta gbuf+2,x
sta gbuf+$100,x
inx
bne clrdir
jsr wrtgbuf write prepared directory extension.
bcs H351D if error
lda own_blk
ldx own_blk+1
jsr rdblk read in parent directory block
ldx own_ent and calc entry address.
lda /gbuf
sta zpt+1
lda #$04
ocalc clc
dex has entry address been calulated?
beq H3584 if yes.
adc own_len next entry address
bcc ocalc
inc zpt+1 entry must be in 2nd 256 bytes of block
bcs ocalc always taken.
H3584 sta zpt
ldy #$13 index to block count
H3588 lda (zpt),y
adc dinctbl-$13,y add 1 to block count and
sta (zpt),y
iny
tya $200 to the directory's eof.
eor #$18 done with usage/eof update?
bne H3588 branch if not.
jsr wrtgbuf go update parent.
bcs crerr2
jmp XDOS.Create
crerr2 rts return and report errors
*--------------------------------------
creat1 ldx #$00 zero out gbuf
H35A0 stz gbuf,x
stz gbuf+$100,x and data block of file.
inx
bne H35A0
ldy #$0B move user specified date/time
cmvtime lda (A3L),y to directory.
sta d_filid,y
txa if all 4 bytes of date/time = 0
ora (A3L),y then use built-in date/time.
tax
dey
cpy #$07
bne cmvtime
txa does user want default time?
bne cmvname if not.
ldx #$03
mvdftime lda p8date,x move current default date/time
sta d_credt,x
dex
bpl mvdftime
cmvname lda (A3L),y y = index to file kind.
cmp #$04
lda #$10 assume tree type
bcc csvfkind
lda #$D0 it's directory.
csvfkind ldx namptr index to local name of pathname.
ora pathbuf,x combine file kind with name length.
sta d_stor sos calls this 'storage type'.
and #$0F strip back to name length
tay and use as counter for move.
clc
adc namptr calc end of name
tax
.DO LOWERCASE=1
stz d_sosver
stz d_comp
.FIN
crname lda pathbuf,x move local name as filename
sta d_stor,y
.DO LOWERCASE=1
cmp #'a'
bcc .3
cmp #'z'+1
bcs .3
eor #$20
sta d_stor,y
cpy #8
bcs .1
lda whichbit,y
tsb d_sosver
bra .2
.1 lda whichbit-8,y
tsb d_comp
.2 lda #$80
tsb d_sosver
.3 .FIN
dex
dey
bne crname
ldy #$03 index to 'access' parameter
lda (A3L),y
sta d_attr
iny also move 'file identification'
lda (A3L),y
sta d_filid
cmvauxid iny move auxillary identification bytes
lda (A3L),y
sta d_auxid-5,y
cpy #$06
bne cmvauxid
.DO LOWERCASE=0
lda xdosver save current xdos version #
sta d_sosver
lda compat and backward compatibility #
sta d_comp
.FIN
lda #$01 usage is always 1 block
sta d_usage
lda d_head place back pointer to header block
sta d_dhdr
lda d_head+1
sta d_dhdr+1
lda d_stor storage type.
and #$E0 is it a directory?
beq cralcblk branch if seed file.
ldx #$1E move header to data block
cmvheadr lda d_stor,x
sta gbuf+4,x
dex
bpl cmvheadr
eor #$30
sta gbuf+4 make it a directory header mark.
ldx #$07 overwrite password area and other
cmvpass lda pass,x header info.
sta gbuf+20,x
lda xdosver,x
sta gbuf+32,x
dex
bpl cmvpass
ldx #$02 and include info about parent directory
stx d_eof+1
cmvparnt lda d_entblk,x
sta gbuf+39,x
dex
bpl cmvparnt
lda h_entln lastly, the length of parent's
sta gbuf+42 directory entries.
cralcblk jsr alc1blk get address of file's data block
bcs crerr3
sta d_frst
sty d_frst+1
sta bloknml
sty bloknml+1
jsr wrtgbuf go write data block of file
bcs crerr3
inc h_fcnt add 1 to total # of files in this dir
bne credone
inc h_fcnt+1
credone jsr drevise go revise directories with new file
bcs crerr3
jmp upbmap lastly, update volume bitmap
*--------------------------------------
entcalc lda /gbuf set high address of dir entry
sta zpt+1 index pointer.
lda #$04 calc address of entry based
ldx d_entnum on the entry #.
H3689 clc
H368A dex addr = gbuf + ((d_entnum-1) * h_entln)
beq H3696 branch with carry clear = no errors.
adc h_entln
bcc H368A
inc zpt+1 inc hi address.
bcs H3689 always.
H3696 sta zpt newly calculated low address.
crerr3 rts carry set if error.
*--------------------------------------
drevise lda p8date
beq drevise1 if no clock, then don't mod date/time.
ldx #$03
modtime lda p8date,x move last modification date/time
sta d_moddt,x to entry being updated.
dex
bpl modtime
drevise1 lda d_attr mark entry as backupable
ora bkbitflg (bit 5 = backup needed)
sta d_attr
lda d_dev get device # of directory
sta devnum to be revised
lda d_entblk and address of direcotry block.
ldx d_entblk+1
jsr rdblk read block into general purpose buffer
bcs crerr3
jsr entcalc fix up ptr to entry location within gbuf.
ldy h_entln now move 'd.' info to directory.
dey
H36CA lda d_stor,y
sta (zpt),y
dey
bpl H36CA
lda d_head is the entry block same as
cmp bloknml the entry's header block?
bne H36E0 if no, go save entry block
lda d_head+1 then maybe, so test high addresses.
cmp bloknml+1
beq uphead branch if they are the same block.
H36E0 jsr wrtgbuf go write updated directory block.
bcs crerr3
lda d_head get address of header block and
ldx d_head+1
jsr rdblk go read in header block to modify.
bcs crerr3
uphead ldy #$01 update current # of files in this dir.
H36F2 lda h_fcnt,y
sta gbuf+37,y (current entry count)
dey
bpl H36F2
lda h_attr also update header's attributes.
sta gbuf+34
jsr wrtgbuf go write updated header
bcs H375A
ripple lda gbuf+4 test for 'root' directory because
and #$F0 if it is, then directory revision
eor #$F0 is complete (leaves carry clear).
beq H3770 branch if done.
lda gbuf+41 get entry #
sta d_entnum
lda gbuf+42 and the length of ertries in that dir
sta h_entln
lda gbuf+39 get addr of parent entry's dir block
ldx gbuf+40
jsr rdblk read it
bcs H375A
jsr entcalc get indirect ptr to parent entry in gbuf
lda p8date don't touch mod
beq H373B if no clock...
ldx #$03 update the modification date & time
ldy #$24 for this entry too
H3732 lda p8date,x
sta (zpt),y
dey
dex
bpl H3732
H373B jsr wrtgbuf write updated entry back to disk.
bcs H375A if error.
ldy #$25 compare current block # to this
lda (zpt),y entry's header block.
iny
cmp bloknml are low addresses the same?
sta bloknml
bne H3751 branch if entry doesn't reside in same
lda (zpt),y block as header.
cmp bloknml+1 are high address the same?
beq ripple they are the same, continue to root dir.
H3751 lda (zpt),y not same so read in this dir's header.
sta bloknml+1
jsr rdgbuf
bcc ripple continue if read was good
H375A rts
tsterr lda #MLI.E.NOTPRODOS not tree or dir, unrecognized type
sec
rts
tstsos lda gbuf pointer to previous dir block
ora gbuf+1 must be null
bne tsterr
lda gbuf+4 test for header
and #$E0
cmp #$E0
bne tsterr
H3770 clc no error
rts
*--------------------------------------
MAN
SAVE USR/SRC/PRODOS.FX/PRODOS.S.XDOS.A
LOAD USR/SRC/PRODOS.FX/PRODOS.S
ASM
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