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Applecorn/auxmem.oscli.s

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* AUXMEM.OSCLI.S
* (c) BOBBI 2021-2022 GPLv3
*
* Handle OSCLI system calls
* 22-Aug-2021 Uses dispatch table
* Prepares parameters and hands on to API call
* 24-Aug-2021 Combined *LOAD and *SAVE, full address parsing.
* 02-Sep-2021 *LOAD/*SAVE now uses GSTRANS.
* 12-Sep-2021 *HELP uses subject lookup, *HELP MOS, *HELP HOSTFS.
* 25-Oct-2021 Implemented *BASIC.
* 07-Oct-2022 *CLOSE is a host command, fixed *EXEC.
* 08-Oct-2022 Rewrote *TYPE, *DUMP, *SPOOL, shares code with *EXEC.
* Sorted command table, added *HELP FILE.
* Optimised CLILOOK dispatcher.
* COMMAND TABLE
***************
* Table structure is: { string, byte OR $80, destword-1 } $00
* Commands are entered with A=command byte with b7=1
* EQ=no parameter
* b6=0 - Enter with XY=>parameters
* b6=1 - Enter with LPTR,Y=>parameters
*
* Ok, let's get around to sorting these
CMDTABLE
CMDFILE ASC 'CAT' ; Must be first command so matches '*.'
DB $85
DW STARFSC-1 ; CAT -> FSC 5, XY=>params
ASC 'CDIR'
DB $88
DW STARFILE-1 ; CDIR -> OSFILE 08, CBLK=>filename
ASC 'CLOSE'
DB $FF
DW CMDCLOSE-1 ; CLOSE -> (LPTR)=>params
ASC 'DELETE'
DB $86
DW STARFILE-1 ; DELETE -> OSFILE 06, CBLK=>filename
ASC 'DUMP'
DB $81 ; TO DO
DW CMDDUMP-1 ; DUMP -> XY=>params
ASC 'EXEC'
DB $81 ; TO DO
DW CMDEXEC-1 ; EXEC -> XY=>params
ASC 'EX'
DB $89
DW STARFSC-1 ; EX -> FSC 9, XY=>params
ASC 'INFO'
DB $8A
DW STARFSC-1 ; INFO -> FSC 10, XY=>params
ASC 'LOAD'
DB $81
DW STARLOAD-1 ; LOAD -> OSFILE FF, CBLK=>filename
ASC 'MKDIR'
DB $88
DW STARFILE-1 ; MKDIR -> OSFILE 08, CBLK=>filename
ASC 'OPT'
DB $8B
DW STARBYTE-1 ; OPT -> OSBYTE &8B,X,Y XY=>params
ASC 'RUN'
DB $84
DW STARFSC-1 ; RUN -> FSC 4, XY=>params
ASC 'RENAME'
DB $8C
DW STARFSC-1 ; RENAME -> FSC 12, XY=>params
ASC 'SAVE'
DB $81
DW STARSAVE-1 ; SAVE -> OSFILE 00, CBLK=>filename
ASC 'SPOOL'
DB $81 ; TO DO
DW CMDSPOOL-1 ; SPOOL -> XY=>params
ASC 'TYPE'
DB $81 ; TO DO
DW CMDTYPE-1 ; TYPE -> XY=>params
* Split between HELP lists
DB $00
*
CMDMOS ASC 'BASIC'
DB $FF
DW STARBASIC-1 ; BASIC -> (LPTR)=>params
ASC 'ECHO'
DB $FF
DW CMDECHO-1 ; ECHO -> (LPTR)=>params
ASC 'FX'
DB $FF
DW STARFX-1 ; FX -> OSBYTE A,X,Y (LPTR)=>params
ASC 'FAST'
DB $FF
DW CMDFAST-1 ; FAST -> (LPTR)=>params
ASC 'HELP'
DB $81
DW STARHELP-1 ; HELP -> XY=>params
ASC 'KEY'
DB $FF
DW STARKEY-1 ; KEY -> (LPTR)=>params
ASC 'QUIT'
DB $FF
DW STARQUIT-1 ; QUIT -> (LPTR)=>params
ASC 'SLOW'
DB $FF
DW CMDSLOW-1 ; SLOW -> (LPTR)=>params
* Table terminator
DB $FF
* *HELP TABLE
*************
HLPTABLE ASC 'MOS'
DB $80
DW HELPMOS-1 ; *HELP MOS
ASC 'FILE'
DB $80
DW HELPFILE-1 ; *HELP FILE
ASC 'HOSTFS'
DB $80
DW HELPHOSTFS-1 ; *HELP HOSTFS
DB $FF
* Command table lookup
* On entry, (OSLPTR)=>command string
* XY=>command table
* On exit, A=0 done, command called
* A<>0 no match
*
* Search command table
CLILOOKUP STX OSTEXT+0 ; Start of command table
STY OSTEXT+1
LDX #0 ; (ZP,X)=>command table
CLILP4 LDY #0 ; Start of command line
CLILP5 LDA (OSTEXT,X)
BMI CLIMATCH ; End of table string
EOR (OSLPTR),Y
AND #$DF ; Force upper case match
BNE CLINOMATCH
JSR CLISTEP ; Step to next table char
INY ; Step to next command char
BNE CLILP5 ; Loop to check
CLINOMATCH LDA (OSLPTR),Y
CMP #'.' ; Abbreviation?
BEQ CLIDOT
CLINEXT JSR CLISTEP ; No match, step to next entry
BPL CLINEXT
CLINEXT2 JSR CLISTEP ; Step past byte, address
JSR CLISTEP
JSR CLISTEP
BNE CLINEXT3
JSR CLISTEP
CLINEXT3 BPL CLILP4 ; Loop to check next
RTS ; Exit, A>$7F
CLIDOT LDA (OSTEXT,X)
BMI CLINEXT2 ; Dot after full word, no match
CLIDOT2 JSR CLISTEP ; Step to command address
BPL CLIDOT2
INY ; Step past dot
BNE CLIMATCH2 ; Jump to this command
CLIMATCH LDA (OSLPTR),Y
CMP #'.'
BEQ CLINEXT ; Longer abbreviation, eg 'CAT.'
CMP #'A'
BCS CLINEXT ; More letters, eg 'HELPER'
CLIMATCH2 JSR CLIMATCH3 ; Call the routine
LDA #0
RTS ; Return A=0 to claim
CLIMATCH3 JSR SKIPSPC ; (OSLPTR),Y=>parameters
PHP ; Save EQ=end of line
LDA (OSTEXT,X) ; Command byte
STA OSTEMP
JSR CLISTEP ; Address low byte
PHA
JSR CLISTEP ; Address high byte
TAX ; X=high
PLA ; A=low
PLP ; EQ=end of line
PHX ; SP->high
PHA ; SP->low, high
PHP ; SP->flg, low, high
* BIT OSTEMP
* BVS CLICALL
LDA OSTEMP
ASL A ; Move bit 6 into bit 7
BMI CLICALL ; If b6=1 don't convert LPTR
BEQ CLICALL ; *TEMP* If $80, skip - remove when HOSTFS updated
*
JSR LPTRtoXY ; XY=>parameters
CLICALL LDA OSTEMP ; A=command parameter
PLP ; EQ=no parameters
RTS ; Call command routine
CLISTEP INC OSTEXT+0,X ; Point to next table byte
BNE CLISTEP2
INC OSTEXT+1,X
CLISTEP2 LDA (OSTEXT,X) ; Get next byte
RTS
* OSCLI HANDLER
* On entry, XY=>command string
* On exit, AXY corrupted or error generated
*
CLIHND JSR XYtoLPTR ; LPTR=>command line
CLILP1 LDA (OSLPTR),Y
CMP #$0D
BEQ CLI2
INY
BNE CLILP1
CLIEXIT1 RTS ; No terminating <cr>
CLI2 LDY #$FF
CLILP2 JSR SKIPSPC1 ; Skip leading spaces
CMP #'*' ; Skip leading stars
BEQ CLILP2
CMP #$0D
BEQ CLIEXIT1 ; Null string
CMP #'|'
BEQ CLIEXIT1 ; Comment
CMP #'/'
BEQ CLISLASH
JSR LPTRtoXY ; Add Y to LPTR
JSR XYtoLPTR ; LPTR=>start of actual command
LDX #<CMDTABLE ; XY=>command table
LDY #>CMDTABLE
JSR CLILOOKUP ; Look for command
BNE CLIUNKNOWN ; No match
CLIDONE RTS
CLISLASH JSR SKIPSPC1
BEQ CLIDONE ; */<cr>
LDA #$02
BNE STARFSC2 ; FSC 2 = */filename
*
CLIUNKNOWN LDA #$04
JSR SERVICE ; Offer to sideways ROM(s)
BEQ CLIDONE ; Claimed
LDA #$03 ; FSC 3 = unknown command
STARFSC2 PHA
JSR LPTRtoXY ; XY=>command
PLA
STARFSC AND #$7F ; A=command, XY=>parameters
JSR CALLFSCV ; Hand on to filing system
TAX
BEQ CLIDONE ; A=0, FSC call implemented
ERRBADCMD BRK
DB $FE
ASC 'Bad command'
ERRBADNUM BRK
DB $FC
ASC 'Bad number'
ERRBADADD BRK
DB $FC
ASC 'Bad address'
BRK
* MOS COMMANDS
**************
* *FX num(,num(,num))
* -------------------
STARFX JSR SCANDEC
BRA STARBYTE1
* Commands passed to OSBYTE
* -------------------------
STARBYTE JSR XYtoLPTR
STARBYTE1 STA OSAREG ; Save OSBYTE number
LDA #$00 ; Default X and Y
STA OSXREG
STA OSYREG
JSR SKIPCOMMA ; Step past any comma/spaces
BEQ STARBYTE2 ; End of line, do it
JSR SCANDEC ; Scan for X param
STA OSXREG ; Store it
JSR SKIPCOMMA ; Step past any comma/spaces
BEQ STARBYTE2 ; End of line, do it
JSR SCANDEC ; Scan for Y param
STA OSYREG ; Store it
JSR SKIPSPC
BNE ERRBADCMD ; More params, error
STARBYTE2 LDY OSYREG
LDX OSXREG
LDA OSAREG
JSR OSBYTE
BVS ERRBADCMD
RTS
* Line scanning
* -------------
* Scan decimal number
SCANDEC JSR SKIPSPC
JSR SCANDIGIT ; Check first digit
BCS ERRBADNUM ; Doesn't start with a digit
SCANDECLP STA OSTEMP ; Store as current number
JSR SCANDIGIT ; Check next digit
BCS SCANDECOK ; No more digits
PHA
LDA OSTEMP
CMP #26
BCS ERRBADNUM ; num>25, num*25>255
ASL A ; num*2
ASL A ; num*4
ADC OSTEMP ; num*4+num = num*5
ASL A ; num*10
STA OSTEMP
PLA
ADC OSTEMP ; num=num*10+digit
BCC SCANDECLP
BCS ERRBADNUM ; Overflowed
SCANDECOK LDA OSTEMP ; Return A=number
SCANDIG2 SEC
RTS
SCANDIGIT LDA (OSLPTR),Y
CMP #'0'
BCC SCANDIG2 ; <'0'
CMP #'9'+1
BCS SCANDIG2 ; >'9'
INY
AND #$0F
RTS
HEXDIGIT JSR SCANDIGIT
BCC HEXDIGIT2 ; Decimal digit
AND #$DF
CMP #'A'
BCC SCANDIG2 ; Bad hex character
CMP #'G'
BCS HEXDIGIT2 ; Bad hex character
SBC #$36 ; Convert 'A'-'F' to $0A-$0F
INY
CLC
HEXDIGIT2 RTS
* Scan hex address
* (OSLPTR),Y=>first character
* $200,X = 4-byte accumulator
SCANHEX JSR HEXDIGIT ; Get first digit
BCS ERRBADADD1 ; Not a hex character
STA $200,X ; Store first digit
LDA #0
STA $201,X ; Clear rest of accumulator
STA $202,X
STA $203,X
SCANHEXLP1 JSR HEXDIGIT ; Get next digit
BCS SKIPSPC ; Done, exit by skipping spaces
STY OSTEMP
LDY #4 ; Four bits to rotate
SCANHEXLP2 ASL $200,X ; Multiple accumulator by 16
ROL $201,X
ROL $202,X
ROL $203,X
BCS ERRBADADD1 ; Overflowed
DEY
BNE SCANHEXLP2 ; Loop for four bits
ORA $200,X ; Add in current digit
STA $200,X
LDY OSTEMP ; Get Y back
BNE SCANHEXLP1
ERRBADADD1 JMP ERRBADADD
SKIPCOMMA LDA (OSLPTR),Y
CMP #$2C
BNE SKIPSPC ; Drop through
*
* Skip spaces
SKIPSPC1 INY ; Step past a character
SKIPSPC LDA (OSLPTR),Y
CMP #' '
BEQ SKIPSPC1
CMP #$0D ; Return EQ=<cr>
RTS
* Skip a string
SKIPWORD CLC
JSR GSINIT
SKIPWORDLP JSR GSREAD
BCC SKIPWORDLP
RTS
* Convert (LPTR),Y to XY
LPTRtoXY CLC
TYA
ADC OSLPTR+0
TAX
LDA #0
ADC OSLPTR+1
TAY
RTS
* Convert XY to (LPTR),Y
XYtoLPTR STX OSLPTR+0
STY OSLPTR+1
LDY #0
STARHELP9 RTS
* *BASIC
* ------
STARBASIC LDX MAXROM
:BASICLP JSR ROMSELECT
BIT $8006
BPL :BASICGO ; No service, must be BASIC
DEX
BPL :BASICLP
JMP ERRBADCMD ; No BASIC, give an error
:BASICGO JMP BYTE8E
* *ECHO <GSTRANS string>
* ----------------------
CMDECHO SEC
ECHO0 JSR GSINIT
:ECHOLP1 JSR GSREAD
BCS STARHELP9
JSR OSWRCH
JMP :ECHOLP1
* *HELP (<options>)
* -----------------
STARHELP JSR XYtoLPTR ; Update OSLPTR=>parameters
JSR PRHELLO ; Unify version message
LDX #<HLPTABLE ; XY=>command table
LDY #>HLPTABLE
JSR CLILOOKUP ; Look for *HELP subject
BEQ STARHELP9 ; Matched
LDA $8006 ; Does ROM have service entry?
BMI STARHELP6 ; Yes, skip to send service call
JSR OSNEWL
LDX #$09 ; Language name
LDY #$80 ; *TO DO* make this and BYTE8E
JSR OSPRSTR ; use same code
JSR OSNEWL
STARHELP6 LDY #0 ; (OSLPTR),Y=>parameters
LDA #9
JMP SERVICE ; Pass to sideways ROM(s)
* Print *HELP text
HELPHOSTFS LDX #<FSCCOMMAND ; *HELP HOSTFS
LDY #>FSCCOMMAND
BNE HELPLIST
HELPFILE LDX #<CMDFILE ; *HELP FILE
LDY #>CMDFILE
BNE HELPLIST
HELPMOS LDX #<CMDMOS ; *HELP MOS
LDY #>CMDMOS
*
HELPLIST STX OSTEXT+0 ; Start of command table
STY OSTEXT+1
LDX #0
HELPLP1 LDA #32
JSR OSWRCH
JSR OSWRCH
HELPLP2 LDY #10
HELPLP3 LDA (OSTEXT,X)
BMI HELPLP4
JSR OSWRCH
DEY
JSR CLISTEP
BPL HELPLP3
HELPLP4 LDA #32
JSR OSWRCH
DEY
BNE HELPLP4
JSR CLISTEP
JSR CLISTEP
JSR CLISTEP
BEQ STARHELP4
BPL HELPLP2
STARHELP4 LDA #$08
JSR OSWRCH
JSR OSWRCH
JMP FORCENL
* *KEY <num> <GSTRANS string>
* ---------------------------
STARKEY RTS
* *QUIT command
* -------------
STARQUIT >>> XF2MAIN,QUIT
* FILING COMMANDS
* ***************
* *LOAD and *SAVE
* ---------------
STARLOAD LDA #$7E ; Set here to A=$7E -> $FF, LOAD
STARSAVE EOR #$81 ; Entered with A=$81 -> $00, SAVE
* Can tweek this after HOSTFS command table updated
PHA
JSR XYtoLPTR ; Update OSLPTR=>filename
JSR SKIPWORD ; Step past filename
BNE STARLDSV3 ; filename followed by addr
*
* filename followed by no address, must be *LOAD name
STARLDSV1 LDA #$FF ; $FF=load to file's address
STARLOAD2 STA OSFILECB+6
PLA
BEQ ERRBADADD2 ; *save name <no addr>
LDA #$7F ; Will become A=$FF
JMP STARLDSVGO ; Do the load
* At least one address specified
STARLDSV3 LDX #OSFILECB+2-$200 ; X=>load
JSR SCANHEX
BNE STARSAVE3 ; Another address
LDA #$00 ; $00=load to supplied address
BEQ STARLOAD2 ; Only one address, must be *LOAD
* More than one address, must be *SAVE
STARSAVE3 PLA
BNE ERRBADADD2 ; Can't be *LOAD
LDX #3
STARSAVE4 LDA OSFILECB+2,X ; Get load
STA OSFILECB+6,X ; copy to exec
STA OSFILECB+10,X ; and to start
DEX
BPL STARSAVE4
LDA (OSLPTR),Y
CMP #'+'
PHP
BNE STARSAVE5 ; Not start+length
JSR SKIPSPC1 ; Step past '+' and spaces
STARSAVE5 LDX #OSFILECB+14-$200
JSR SCANHEX ; Get end or length
PLP
BNE STARSAVE7 ; Not +length
LDX #0
CLC
STARSAVE6 LDA OSFILECB+10,X ; end=start+length
ADC OSFILECB+14,X
STA OSFILECB+14,X
INX
TXA
AND #3
BNE STARSAVE6
* load =start
* exec =start
* start=start
* end =end or start+length
STARSAVE7 JSR SKIPSPC
BEQ STARSAVE10 ; No more, do it
LDX #OSFILECB+6-$200
JSR SCANHEX ; Get exec
BEQ STARSAVE10 ; No more, do it
LDX #OSFILECB+2-$200
JSR SCANHEX ; Get load
BEQ STARSAVE10 ; No more, do it
ERRBADADD2 JMP ERRBADADD ; Too many parameters
STARSAVE10 LDA #$80 ; Will become $00 - SAVE
STARLDSVGO LDX OSLPTR+0
LDY OSLPTR+1 ; Continue through...
*
* Commands passed to OSFILE
* -------------------------
STARFILE EOR #$80
STX OSFILECB+0
STY OSFILECB+1
LDX #<OSFILECB
LDY #>OSFILECB
JSR OSFILE
TAX
BNE STARDONE
JMP ERRNOTFND
* *CLOSE
* ------
CMDCLOSE LDA #$00
TAY
JSR OSFIND ; Close all files
STA FXEXEC ; Ensure Spool/Exec handles cleared
STA FXSPOOL
STARDONE RTS
* *TYPE <afsp>
* ------------
* XY=>parameters string, EQ=no parameters
*
CMDTYPE BEQ ERRTYPE ; No filename
JSR OPENINFILE ; Try to open file
:LOOP JSR OSBGET ; Read a byte
BCS TYPDMPEND ; EOF
CMP #$0A
BEQ :LOOP ; Ignore <lf>
TAX ; Remember last character
JSR OSASCI ; Print the character
BIT ESCFLAG
BPL :LOOP ; No Escape, keep going
TYPEESC JSR TYPCLOSE
ERRESCAPE BRK
DB $11
ASC 'Escape'
BRK
TYPDMPEND CPX #$0D
BEQ TYPCLOSE
JSR OSNEWL
TYPCLOSE LDA #$00
JMP OSFIND ; Close file
ERRTYPE BRK
DB $DC
ASC 'Syntax: TYPE <afsp>'
ERRDUMP BRK
DB $DC
ASC 'Syntax: DUMP <afsp>'
BRK
* Handle *DUMP command
* --------------------
* XY=>parameters string, EQ=no parameters
*
CMDDUMP BEQ ERRDUMP ; No filename
JSR OPENINFILE ; Try to open file
STZ OSNUM+0 ; Offset = zero
STZ OSNUM+1
:LOOP1 BIT ESCFLAG
BMI TYPEESC ; Escape pressed
PHY ; Save handle
TYA
TAX ; X=handle
LDA #$7F
JSR OSBYTE ; Read EOF
PLY ; Get handle back
TXA
BNE TYPCLOSE ; At EOF
LDA OSNUM+1 ; Print file offset
JSR PRHEX
LDA OSNUM+0
JSR PRHEX
JSR PRSPACE
LDA #8 ; 8 bytes to dump
STA OSNUM+2
TSX ; Reserve bytes on stack
TXA
SEC
SBC OSNUM+2
TAX
TXS ; X=>space on stack
:LOOP2 JSR OSBGET ; Read a byte
BCS :DUMPEOF
STA $0101,X ; Store on stack
JSR PRHEX ; Print as hex
JSR PRSPACE
INX
DEC OSNUM+2
BNE :LOOP2 ; Loop to do 8 bytes
CLC ; CLC=Not EOF
BCC :DUMPCHRS ; Jump to display characters
:DUMPEOF LDA #'*' ; EOF met, pad with '**'
JSR OSWRCH
JSR OSWRCH
JSR PRSPACE
LDA #$00
STA $0101,X
INX
DEC OSNUM+2
BNE :DUMPEOF ; Loop to do 8 bytes
SEC ; SEC=EOF
:DUMPCHRS LDX #8 ; 8 bytes to print
:LOOP4 PLA ; Get character
PHP ; Save EOF flag
CMP #$7F
BEQ :DUMPDOT
CMP #' '
BCS :DUMPCHR
:DUMPDOT LDA #'.'
:DUMPCHR JSR OSWRCH ; Print character
INC OSNUM+0 ; Increment offset
BNE :DUMPNXT
INC OSNUM+1
:DUMPNXT PLP ; Get EOF flag back
DEX
BNE :LOOP4 ; Loop to do 8 bytes
PHP
JSR OSNEWL
PLP
BCC :LOOP1
JMP TYPCLOSE ; Close and finish
* *SPOOL (<afsp>)
* ---------------
* XY=>parameters string, EQ=no parameters
*
CMDSPOOL PHP ; Save EQ/NE
PHY ; Save Y
LDY FXSPOOL ; Get SPOOL handle
BEQ :SPOOL1 ; Wasn't open, skip closing
LDA #$00 ; A=CLOSE
STA FXSPOOL ; Clear SPOOL handle
JSR OSFIND ; Close SPOOL file
:SPOOL1 PLY ; Get Y back, XY=>filename
PLP ; Get NE=filename, EQ=no filename
BEQ :DONE ; No filename, all done
LDA #$80 ; A=OPENOUT, for writing
JSR OPENAFILE ; Try to open file
STA FXSPOOL ; Store SPOOL handle
:DONE RTS
* *EXEC (<afsp>)
* --------------
* XY=>parameters string, EQ=no parameters
*
CMDEXEC0 LDA #$00 ; Close EXEC file
CMDEXEC PHP ; Save EQ/NE
PHY ; Save Y
LDY FXEXEC ; Get EXEC handle
BEQ :EXEC1 ; Wasn't open, skip closing it
LDA #$00 ; A=CLOSE
STA FXEXEC ; Clear EXEC handle
JSR OSFIND ; Close EXEC file
:EXEC1 PLY ; Get Y back, XY=>filename
PLP ; Get NE=filename, EQ=no filename
BEQ EXECDONE ; No filename, all done
JSR OPENINFILE ; Try to open file
STA FXEXEC ; Store EXEC file handle
EXECDONE RTS
OPENINFILE LDA #$40 ; Open for input
OPENAFILE JSR OSFIND ; Try to open file
TAY ; Was file opened?
BNE EXECDONE ; File opened
EXECNOTFND JMP ERRNOTFND ; File not found
* ZIP SPEED COMMANDS
* ==================
* Handle *FAST command
* --------------------
* Turn Apple II accelerators on
CMDFAST LDA #$80 ; Apple IIgs
TSB CYAREG
STA GSSPEED
JSR ZIPUNLOCK ; ZipChip
JSR ZIPDETECT
BCC :NOZIP
STA $C05B ; Enable
BCS ZIPLOCK
:NOZIP STA $C05C ; Ultrawarp fast
RTS
* Handle *SLOW command
* --------------------
* Turn Apple II accelerators off
CMDSLOW LDA #$80 ; Apple IIgs
TRB CYAREG
STZ GSSPEED
JSR ZIPUNLOCK ; ZipChip
JSR ZIPDETECT
BCC :NOZIP
STZ $C05A ; Disable
BCS ZIPLOCK
:NOZIP STA $C05D ; Ultrawarp slow
RTS
* Detect a ZipChip
* Set carry is ZipChip found
DETECTZIP
ZIPDETECT LDA $C05C ; ZipChip manual p25
EOR #$FF
STA $C05C
CMP $C05C
BNE :NOZIP
EOR #$FF
STA $C05C
CMP $C05C
BEQ :ZIPOK ; BEQ already has SEC
* BNE :NOZIP
* SEC
* RTS
:NOZIP CLC
:ZIPOK RTS
* Unlock ZipChip registers
UNLOCKZIP
ZIPUNLOCK PHP
SEI ; Timing sensitive
LDA #$5A
STA $C05A
STA $C05A
STA $C05A
STA $C05A
PLP
RTS
* Lock ZipChip registers
LOCKZIP
ZIPLOCK LDA #$A5
STA $C05A
RTS
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