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Applecorn/auxmem.hostfs.s
Bobbi Webber-Manners 80c4a99032 Update .po disk image.
2021-09-17 17:51:11 -04:00

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* AUXMEM.HOSTFS.S
* (c) Bobbi 2021 GPL v3
*
* AppleMOS Host File System
* 29-Aug-2021 Generalised CHKERROR routone, checks for and
* translates ProDOS errors into Acorn errors
* Set &E0=&FF for testing to report ProDOS errors
* 30-Aug-2021 FSC commands moved to here
* Command line set by *RUN, and read by OSARGS
FSXREG EQU $B0
FSYREG EQU $B1
FSAREG EQU $B2
FSCTRL EQU FSXREG
FSPTR1 EQU $B4
FSPTR2 EQU $B6
FSCMDLINE EQU $CE
* OSFIND - open/close a file for byte access
FINDHND PHX
PHY
PHA
CMP #$00 ; A=$00 = close
BEQ :CLOSE
PHA
JSR PARSNAME ; Copy filename->MOSFILE
PLA ; Recover options
>>> XF2MAIN,OFILE
:CLOSE >>> WRTMAIN
STY MOSFILE ; Write file number
>>> WRTAUX
>>> XF2MAIN,CFILE
OSFINDRET
>>> ENTAUX
PLY ; Value of A on entry
CPY #$00 ; Was it close?
BNE :S1
TYA ; Preserve A for close
:S1 PLY
PLX
RTS
* OSGBPB - Get/Put a block of bytes to/from an open file
GBPBHND LDA #<OSGBPBM
LDY #>OSGBPBM
JMP PRSTR
OSGBPBM ASC 'OSGBPB.'
DB $00
* OSBPUT - write one byte to an open file
BPUTHND PHX
PHY
PHA ; Stash char to write
>>> WRTMAIN
STY MOSFILE ; File reference number
>>> WRTAUX
>>> XF2MAIN,FILEPUT
OSBPUTRET
>>> ENTAUX
CLC ; Means no error
PLA
PLY
PLX
RTS
* OSBGET - read one byte from an open file
BGETHND PHX
PHY
>>> WRTMAIN
STY MOSFILE ; File ref number
>>> WRTAUX
>>> XF2MAIN,FILEGET
OSBGETRET
>>> ENTAUX
CLC ; Means no error
CPY #$00 ; Check error status
BEQ :NOERR
SEC ; Set carry for error
BRA :EXIT
:NOERR CLC
:EXIT PLY
PLX
RTS
* OSARGS - adjust file arguments
* On entry, A=action
* Y<>0 A=FF Flush channel Y
* A=00 Read PTR#Y
* A=01 Write PTR#Y
* A=02 Read EXT#Y
* A=03 Write EXT#Y
* Y=0 A=FF Flush all channels
* A=00 Return filing system number in A
* A=01 Read command line address
* X=>4 byte ZP control block
* Y=file handle
* On exit, A=0 - implemented (except ARGS 0,0)
* A - preserved=unimplemented
* X,Y - preserved
* control block updated for 'read' calls
* control block preserved otherwise
*
ARGSHND PHX
PHY
PHA
CPY #$00
BNE :HASFILE
CMP #$00 ; Y=0,A=0 => current file sys
BNE :S1
PLA
LDA #105 ; 105=AppleFS filing system
PLY
PLX
RTS
:S1 CMP #$01 ; Y=0,A=1 => addr of CLI
BNE :S2
LDA FSCMDLINE+0
STA $00,X
LDA FSCMDLINE+1
STA $01,X
LDA #$FF
STA $02,X
STA $03,X
JMP OSARGSDONE ; Implemented
:S2 CMP #$FF ; Y=0,A=FF => flush all files
BNE :IEXIT
>>> WRTMAIN
STZ MOSFILE ; Zero means flush all
>>> WRTAUX
JMP :FLUSH
:IEXIT JMP :EXIT ; Exit preserved
:HASFILE >>> WRTMAIN
STY MOSFILE ; File ref num
STX MOSFILE+1 ; Pointer to ZP control block
>>> WRTAUX
CMP #$00 ; Y!=0,A=0 => read seq ptr
BNE :S3
>>> WRTMAIN
STZ MOSFILE+2 ; 0 means get pos
>>> WRTAUX
>>> XF2MAIN,TELL
:S3 CMP #$01 ; Y!=0,A=1 => write seq ptr
BNE :S4
>>> WRTMAIN
LDA $00,X
STA MOSFILE+2
LDA $01,X
STA MOSFILE+3
LDA $02,X
STA MOSFILE+4
>>> WRTAUX
>>> XF2MAIN,SEEK
:S4 CMP #$02 ; Y!=0,A=2 => read file len
BNE :S5
>>> WRTMAIN
STA MOSFILE+2 ; Non-zero means get len
>>> WRTAUX
>>> XF2MAIN,TELL
:S5 CMP #$FF ; Y!=0,A=FF => flush file
BNE :EXIT
:FLUSH >>> XF2MAIN,FLUSH
:EXIT PLA ; Unimplemented
PLY
PLX
RTS
OSARGSRET >>> ENTAUX
OSARGSDONE PLA
LDA #0 ; Implemented
PLY
PLX
RTS
* OSFILE - perform actions on entire files
* On entry, A=action
* XY=>control block
* On exit, A=preserved if unimplemented
* A=0 object not found (not load/save)
* A=1 file found
* A=2 directory found
* XY preserved
* control block updated
FILEHND PHX
PHY
PHA
STX CBPTR ; LSB of parameter block
STX ZP1
STY CBPTR+1 ; MSB of parameter block
STY ZP1+1
LDA (ZP1) ; Filename ptr->XY
TAX
LDY #$01
LDA (ZP1),Y
TAY
JSR PARSNAME ; Copy filename->MOSFILE
LDA #<FILEBLK
STA ZP2
LDA #>FILEBLK
STA ZP2+1
LDY #$00 ; Copy to FILEBLK in main mem
:L1 LDA (ZP1),Y
>>> WRTMAIN
STA (ZP2),Y
>>> WRTAUX
INY
CPY #$12
BNE :L1
PLA ; Get action back
PHA
BEQ :SAVE ; A=00 -> SAVE
CMP #$FF
BEQ :LOAD ; A=FF -> LOAD
CMP #$06
BEQ :DELETE ; A=06 -> DELETE
BCC :JMPINFO ; A=01-05 -> INFO
CMP #$08
BEQ :MKDIR ; A=08 -> MKDIR
PLA ; Not implemented, return unchanged
PLY
PLX
RTS
:JMPINFO JMP :INFO
:SAVE >>> XF2MAIN,SAVEFILE
:LOAD >>> XF2MAIN,LOADFILE
:DELETE >>> XF2MAIN,DELFILE
:MKDIR >>> XF2MAIN,MAKEDIR
:INFO >>> XF2MAIN,INFOFILE
* On return here, A<$20 return to caller, A>$1F ProDOS error
OSFILERET
>>> ENTAUX
PHA
LDA CBPTR ; Copy OSFILE CB to :CBPTR addr
STA ZP1
LDA CBPTR+1
STA ZP1+1
LDY #$02
:L3 LDA AUXBLK,Y ; Mainmem left it in AUXBLK
STA (ZP1),Y
INY
CPY #18 ; 18 bytes in control block
BNE :L3
PLA
PLY ; Original action
JSR CHKERROR ; Check if error returned
PLY ; No error, return to caller
PLX
RTS
ERRNOTFND BRK
DB $D6 ; $D6 = Object not found
ASC 'File not found'
BRK
ERREXISTS BRK
DB $C4 ; Can't create a dir if a file is
ASC 'File exists' ; already there
BRK
CBPTR DW $0000
OSFILEM ASC 'OSFILE($'
DB $00
OSFILEM2 ASC ')'
DB $00
OSFSCM ASC 'OSFSC.'
DB $00
* FSC Command Table
*******************
* These are commands specific to the filing system that can't be
* called via OSFILE, OSFSC, etc.
*
FSCCOMMAND ASC 'CHDIR'
DB $C0
DW FSCCHDIR-1 ; Change directory, XY=>params
ASC 'CD'
DB $C0
DW FSCCHDIR-1 ; Change directory, XY=>params
ASC 'DIR'
DB $C0
DW FSCCHDIR-1 ; Change directory, XY=>params
* TO DO, CHDIR should be $80 for LPTR=>params
ASC 'DRIVE'
DB $80
DW FSCDRIVE-1 ; Select drive, LPTR=>params
ASC 'FREE'
DB $80
DW FSCFREE-1 ; FREE <drive>, LPTR=>params
ASC 'ACCESS'
DB $80
DW FSCACCESS-1 ; ACCESS <objlist> <access>, LPTR=>params
ASC 'TITLE'
DB $80
DW FSCTITLE-1 ; TITLE (<drive>) <title>, LPTR=>params
ASC 'DESTROY'
DB $80
DW FSCDESTROY-1 ; DESTROY <objlist>, LPTR=>params
*
DB $FF ; Terminator
* OSFSC - miscellanous file system calls
*****************************************
* On entry, A=action, XY=>command line
* or A=action, X=param1, Y=param2
* On exit, A=preserved if unimplemented
* A=modified if implemented
* X,Y=any return values
*
FSCHND
CMP #$00
BEQ FSOPT ; A=0 - *OPT
CMP #$01
BEQ CHKEOF ; A=1 - Read EOF
CMP #$02
BEQ FSCRUN ; A=2 - */filename
CMP #$03
BEQ FSC03 ; A=3 - *command
CMP #$04
BEQ FSCRUN ; A=4 - *RUN
CMP #$05
BEQ JMPCAT ; A=5 - *CAT
CMP #$09
BEQ JMPCAT ; A=9 - *EX
CMP #$0A
BEQ JMPCAT ; A=10 - *INFO
CMP #$0C
BEQ FSCREN ; A=12 - *RENAME
* Performs OSFSC *OPT function
FSOPT RTS ; No FS options for now
FSCDRIVE JMP DRIVE
FSCFREE JMP FREE
FSCACCESS JMP ACCESS
FSCDESTROY JMP DESTROY
FSCTITLE
FSCUKN PHA
LDA #<OSFSCM
LDY #>OSFSCM
JSR PRSTR
PLA
FSCNULL RTS
JMPCAT JMP FSCCAT
FSC03 JSR XYtoLPTR
LDX #<FSCCOMMAND
LDY #>FSCCOMMAND
JSR CLILOOKUP
BEQ FSCNULL
JSR LPTRtoXY
*
FSCRUN STX OSFILECB ; Pointer to filename
STY OSFILECB+1
JSR XYtoLPTR
FSCRUNLP LDA (OSLPTR),Y ; Look for command line
INY
CMP #'!'
BCS FSCRUNLP
DEY
JSR SKIPSPC
JSR LPTRtoXY
STX FSCMDLINE+0 ; Set CMDLINE=>command line
STY FSCMDLINE+1 ; Collected by OSARGS 1,0
LDA #$FF ; OSFILE load flag
STA OSFILECB+6 ; Use file's address
LDX #<OSFILECB ; Pointer to control block
LDY #>OSFILECB
JSR OSFILE
JSR :CALL
LDA #$00 ; A=0 on return
RTS
:CALL LDA #$01 ; A=1 - entering code
SEC ; Not from RESET
JMP (OSFILECB+6) ; Jump to EXEC addr
FSCREN JMP RENAME
FSCCHDIR JMP CHDIR
* Performs OSFSC Read EOF function
* File ref number is in X
CHKEOF >>> WRTMAIN
STX MOSFILE ; File reference number
>>> WRTAUX
>>> XF2MAIN,FILEEOF
CHKEOFRET
>>> ENTAUX
TAX ; Return code -> X
RTS
* Perform CAT
* A=5 *CAT, A=9 *EX, A=10 *INFO
FSCCAT PHA
JSR PARSNAME ; Copy filename->MOSFILE
PLA
ASL A
ASL A
ASL A ; 0101xxxx=*CAT
ASL A ; 1001xxxx=*EX
STA FSAREG ; 1010xxxx=*INFO
>>> XF2MAIN,CATALOG
STARCATRET
>>> ENTAUX
PHA
JSR FORCENL
PLA
JSR CHKERROR ; See if error occurred
CATDONE LDA #0 ; 0=OK
RTS
* Print one block of a catalog. Called by CATALOG
* Block is in AUXBLK
PRONEBLK >>> ENTAUX
LDA AUXBLK+4 ; Get storage type
AND #$E0 ; Mask 3 MSBs
CMP #$E0
BNE :NOTKEY ; Not a key block
LDA #<:DIRM
LDY #>:DIRM
JSR PRSTR
SEC
:NOTKEY LDA #$00
:L1 PHA
PHP
JSR PRONEENT
PLP
BCC :L1X
JSR OSNEWL
:L1X PLA
INC
CMP #13 ; Number of dirents in block
CLC
BNE :L1
>>> XF2MAIN,CATALOGRET
:DIRM ASC 'Directory: '
DB $00
* Print a single directory entry
* On entry: A = dirent index in AUXBLK
PRONEENT PHP
TAX
LDA #<AUXBLK+4 ; Skip pointers
STA ZP3
LDA #>AUXBLK+4
STA ZP3+1
:L1 CPX #$00
BEQ :S1
CLC
LDA #$27 ; Size of dirent
ADC ZP3
STA ZP3
LDA #$00
ADC ZP3+1
STA ZP3+1
DEX
BRA :L1
:S1 LDY #$00
LDA (ZP3),Y
BEQ :EXIT1 ; Inactive entry
AND #$0F ; Len of filename
TAX
LDY #$01
:L2 CPX #$00
BEQ :S2
LDA (ZP3),Y
JSR OSWRCH
DEX
INY
BRA :L2
:S2 PLP
BCS :EXIT
LDA #$20
BIT FSAREG
BPL :S2LP
INY
INY
INY
INY
:S2LP JSR OSWRCH
INY
CPY #$15
BNE :S2LP
BIT FSAREG
BPL :EXIT
LDY #$21
LDX #3
LDA #0
JSR PRADDR0
LDA #'+'
JSR OSWRCH
LDY #$17
JSR PRADDR
JSR PRSPACE
LDY #$00
LDA (ZP3),Y
AND #$F0
CMP #$D0
BNE :NOTDIR
LDA #'D'
JSR OSWRCH
JSR PRLOCK
JMP OSNEWL
:NOTDIR JSR PRLOCK
LDA (ZP3),Y
LSR A
PHP
AND #1
BEQ :NOWR
LDA #'W'
JSR OSWRCH
:NOWR PLP
BCC :NOWR
LDA #'R'
JSR OSWRCH
:NORD
* JSR PRSPACE
* LDY #$22
* LDX #2
* JSR PRADDRLP
JMP OSNEWL
:EXIT1 PLP
:EXIT RTS
PRLOCK LDY #$1E
LDA (ZP3),Y
CMP #$40
BCS PRADDROK
LDA #'L'
JMP OSWRCH
PRADDR LDX #3
PRADDRLP LDA (ZP3),Y
PRADDR0 JSR OUTHEX
DEY
DEX
BNE PRADDRLP
PRADDROK RTS
PRSPACE LDA #' '
JMP OSWRCH
* Perform FSCV $0C RENAME function
* Parameter string in XY
RENAME JSR PARSNAME ; Copy Arg1->MOSFILE
CMP #$00 ; Length of arg1
BEQ :SYNTAX
JSR PARSLPTR2 ; Copy Arg2->MOSFILE2
CMP #$00 ; Length of arg2
BEQ :SYNTAX
>>> XF2MAIN,RENFILE
:SYNTAX BRK
DB $DC
ASC 'Syntax: RENAME <objspec> <objspec>'
BRK
RENRET
>>> ENTAUX
JSR CHKERROR
LDA #$00
RTS
* Perform *COPY function
* Parameter string in XY
COPY JSR PARSNAME ; Copy Arg1->MOSFILE
CMP #$00 ; Length of arg1
BEQ :SYNTAX
JSR PARSLPTR2 ; Copy Arg2->MOSFILE2
CMP #$00 ; Length of arg2
BEQ :SYNTAX
>>> XF2MAIN,COPYFILE
:SYNTAX BRK
DB $DC
ASC 'Syntax: COPY <listspec> <*objspec*>'
BRK
COPYRET
>>> ENTAUX
JSR CHKERROR
LDA #$00
RTS
* Handle *DIR (directory change) command
* On entry, XY points to command line
CHDIR JSR PARSNAME ; Copy filename->MOSFILE
CMP #$00 ; Filename length
BNE :HASPARM
BRK
DB $DC
ASC 'Syntax: DIR <*objspec*>'
BRK
:HASPARM >>> XF2MAIN,SETPFX
* Handle *DRIVE command, which is similar
* On entry, (OSLPTR),Y points to command line
DRIVE LDA (OSLPTR),Y ; First char
CMP #$3A ; Colon
BNE :ERR
JSR PARSLPTR ; Copy arg->MOSFILE
CMP #$03 ; Check 3 char arg
BEQ :HASPARM
:ERR BRK
DB $DC
ASC 'Syntax: DRIVE <dry> (eg: DRIVE :61)'
BRK
:HASPARM >>> XF2MAIN,SETPFX
CHDIRRET
>>> ENTAUX
JSR CHKERROR
CMP #$00
BEQ :EXIT
BRK
DB $CE ; Bad directory
ASC 'Bad dir'
BRK
:EXIT RTS
* Handle *FREE command
FREE LDA (OSLPTR),Y ; First char
CMP #$3A ; Colon
BNE :ERR
JSR PARSLPTR ; Copy arg->MOSFILE
CMP #$03 ; Check 3 char arg
BEQ :HASPARM
:ERR BRK
DB $DC
ASC 'Syntax: FREE <dry> (eg: DRIVE :61)'
BRK
:HASPARM >>> XF2MAIN,DRVINFO
FREERET
>>> ENTAUX
JSR CHKERROR
CMP #$00
BEQ :NOERR
BRK
DB $CE ; Bad directory
ASC 'Bad dir'
BRK
:NOERR SEC
LDA AUXBLK+2 ; LSB of total blks
SBC AUXBLK ; LSB of blocks used
TAX
LDA AUXBLK+3 ; MSB of total blks
SBC AUXBLK+1 ; MSB of blocks used
TAY
JSR PRDECXY ; Print in decimal
LDX #<:FREEM
LDY #>:FREEM
JSR OUTSTR
JSR FORCENL
LDX AUXBLK+0 ; Blocks used
LDY AUXBLK+1
JSR PRDECXY ; Print in decimal
LDX #<:USEDM
LDY #>:USEDM
JSR OUTSTR
JSR FORCENL
RTS
:FREEM ASC ' 512-byte Blocks Free'
DB $00
:USEDM ASC ' 512-byte Blocks Used'
DB $00
ACCESS JSR PARSLPTR ; Copy filename->MOSFILE
CMP #$00 ; Filename length
BEQ :SYNTAX
JSR PARSLPTR2 ; Copy Arg2->MOSFILE2
>>> XF2MAIN,SETPERM
:SYNTAX BRK
DB $DC
ASC 'Syntax: ACCESS <listspec> <L|R|W>'
BRK
ACCRET >>> ENTAUX
JSR CHKERROR
LDA #$00
RTS
DESTROY JSR PARSLPTR ; Copy filename->MOSFILE
CMP #$00 ; Filename length
BEQ :SYNTAX
>>> XF2MAIN,MULTIDEL
:SYNTAX BRK
DB $DC
ASC 'Syntax: DESTROY <listspec>'
BRK
DESTRET >>> ENTAUX
JSR CHKERROR
LDA #$00
RTS
* Parse filename pointed to by XY
* Write filename to MOSFILE in main memory
* Returns length in A
PARSNAME JSR XYtoLPTR
PARSLPTR CLC ; Means parsing a filename
JSR GSINIT ; Init gen string handling
PHP
SEI ; Disable IRQs
LDX #$00 ; Length
:L1 JSR GSREAD ; Handle next char
BCS :DONE
STA $C004 ; Write to main mem
STA MOSFILE+1,X
STA $C005 ; Write to aux mem
INX
BNE :L1
:DONE STA $C004 ; Write to main mem
STX MOSFILE ; Length byte (Pascal)
STA $C005 ; Back to aux
PLP ; IRQs back as they were
TXA ; Return len in A
RTS
* Parse filename pointed to by (OSLPTR),Y
* Write filename to MOSFILE2 in main memory
* Returns length in A
PARSNAME2 JSR XYtoLPTR
PARSLPTR2 CLC ; Means parsing a filename
JSR GSINIT ; Init gen string handling
PHP
SEI ; Disable IRQs
LDX #$00 ; Length
:L1 JSR GSREAD ; Handle next char
BCS :DONE
STA $C004 ; Write to main mem
STA MOSFILE2+1,X
STA $C005 ; Write to aux mem
INX
BNE :L1
:DONE STA $C004 ; Write to main mem
STX MOSFILE2 ; Length byte (Pascal)
STA $C005 ; Back to aux
PLP ; IRQs back as they were
TXA ; Return len in A
RTS
* Move this somewhere
CHKERROR CMP #$20
BCS MKERROR
RTS
*ERREXISTS LDA #$47 ; File exists
*ERRNOTFND LDA #$46 ; File not found
MKERROR
BIT $E0
BPL MKERROR1 ; *TEST*
PHA
LDX #15
MKERRLP
LDA ERRMSG,X
STA $100,X
DEX
BPL MKERRLP
PLA
PHA
LSR A
LSR A
LSR A
LSR A
JSR ERRHEX
STA $109
PLA
JSR ERRHEX
STA $10A
JMP $100
ERRHEX
AND #15
CMP #10
BCC ERRHEX1
ADC #6
ERRHEX1
ADC #48
RTS
ERRMSG
BRK
DB $FF
ASC 'TEST: $00'
BRK
MKERROR1
CMP #$40
BCS MKERROR2
ADC #$31
MKERROR2
SEC
SBC #$40
CMP #$20
BCC MKERROR3
LDA #$18 ; I/O error
MKERROR3
ASL A
TAX
LDA MKERROR4+1,X
PHA
LDA MKERROR4+0,X
PHA
PHP
RTI
MKERROR4
DW ERROR40,ERROR41,ERROR42,ERROR43,ERROR44,ERROR45,ERROR46,ERROR47
DW ERROR48,ERROR49,ERROR4A,ERROR4B,ERROR4C,ERROR4D,ERROR4E,ERROR4F
DW ERROR50,ERROR51,ERROR52,ERROR53,ERROR54,ERROR55,ERROR56,ERROR57
DW ERROR27,ERROR28,ERROR5A,ERROR5B,ERROR2B,ERROR5D,ERROR5E,ERROR2E
* $40 - Invalid pathname syntax. Bad filename
* $41 - Duplicate filename. (additional) Directory exists
* $42 - File Control Block table full. Too many open
* $43 - Invalid reference number. Channel not open
* $44 - Path not found. File not found
* $45 - Volume directory not found. Disk not found
* $46 - File not found. File not found
* $47 - Duplicate filename. (see also $41) File exists
* $48 - Overrun error. Disk full
* $49 - Volume directory full. Directory full
* $4A - Incompatible file format. Disk not recognised
* $4B - Unsupported storage_type. Disk not recognised
* $4C - End of file has been encountered. End of file
* $4D - Position out of range. Past end of file
* $4E - Access error. (see also $4F) RD/WR: Insufficient access
* $4F - Access error. (additional) REN/DEL: Locked
* $50 - File is open. Can't - file open
* $51 - Directory count error. Broken directory
* $52 - Not a ProDOS disk. Disk not recognised
* $53 - Invalid parameter. Invalid parameter
* $54 - (Dir not empty when deleting) Dir not empty
* $55 - Volume Control Block table full.
* $56 - Bad buffer address.
* $57 - Duplicate volume.
* ($58) $27 - I/O error (disk not formatted)
* ($59) $28 - No device connected (drive not present) Disk not present
* $5A ($29) - Bit map disk address is impossible. Sector not found
* $5B $2A -
* ($5C) $2B - Disk write protected. Disk write protected
* $5D ($2C) - (EOF during load or save) Data lost
* $5E ($2D) - (Couldn't open to save) Can't save
* ($5F) $2E - Disk switched Disk changed
* $2F - Device is offline (drive empty)
*
* AcornOS ProDOS
ERROR40 DW $CC00
ASC 'Bad filename' ; $40 - Invalid pathname syntax
ERROR41 DW $C400
ASC 'Directory exists' ; $41 - Duplicate filename (split from $47)
ERROR42 DW $C000
ASC 'Too many open' ; $42 - File Control Block table full
ERROR43 DW $DE00
ASC 'Channel not open' ; $43 - Invalid reference number
ERROR44 ; $44 - Path not found
ERROR46 DW $D600
ASC 'File not found' ; $46 - File not found
ERROR45 DW $D600
ASC 'Disk not found' ; $45 - Volume directory not found
ERROR47 DW $C400
ASC 'File exists' ; $47 - Duplicate filename (see also $41)
ERROR48 DW $C600
ASC 'Disk full' ; $48 - Overrun error
ERROR49 DW $B300
ASC 'Directory full' ; $49 - Volume directory full
ERROR4A ; $4A - Incompatible file format
ERROR4B ; $4B - Unsupported storage_type
ERROR52 DW $C800
ASC 'Disk not recognised' ; $52 - Not a ProDOS disk
ERROR4C DW $DF00
ASC 'End of file' ; $4C - End of file has been encountered
ERROR4D DW $C100
ASC 'Not open for update' ; $4D - Position out of range
ERROR4E DW $BD00
ASC 'Insufficient access' ; $4E - Access error (see also $4F)
ERROR4F DW $C300
ASC 'Locked' ; $4F - Access error (split from $4E)
ERROR50 DW $C200
ASC 'Can'
DB $27
ASC 't - file open' ; $50 - File is open
ERROR51 DW $A800
ASC 'Broken directory' ; $51 - Directory count error
ERROR53 DW $DC00
ASC 'Invalid parameter' ; $53 - Invalid parameter
ERROR54 DW $D400
ASC 'Directory not empty' ; $54 - Directory not empty
ERROR55 DW $FF00
ASC 'ProDOS: VCB full' ; $55 - Volume Control Block table full
ERROR56 DW $FF00
ASC 'ProDOS: Bad addr' ; $56 - Bad buffer address
ERROR57 DW $FF00
ASC 'ProDOS: Dup volm' ; $57 - Duplicate volume
ERROR5B ; spare
ERROR27 DW $FF00
ASC 'I/O error' ; $27 - I/O error
ERROR28 DW $D200
ASC 'Disk not present' ; $28 - No device detected/connected
ERROR5A DW $FF00
ASC 'Sector not found' ; $5A - Bit map disk address is impossible
ERROR2B DW $C900
ASC 'Disk write protected' ; $2B - Disk write protected
ERROR5D DW $CA00
ASC 'Data lost' ; $5D - EOF during LOAD or SAVE
ERROR5E DW $C000
ASC 'Can'
DB $27
ASC 't save' ; $5E - Couldn't open for save
ERROR2E DW $C800
ASC 'Disk changed' ; $2E - Disk switched
DB $00
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