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Applecorn/auxmem.misc.s

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* AUXMEM.MISC.S
* (c) Bobbi 2021 GPLv3
*
* Misc functions and API entry block
* 02-Sep-2021 Written GSINIT/GSREAD
* 11-Sep-2021 PR16DEC uses OS workspace, added rest of default vectors/etc.
* 20-Sep-2021 Updated PRDECIMAL routine, prints up to 32 bits.
* 25-Oct-2021 Initial pseudo-sideways ROM selection code.
* 26-Oct-2021 Corrected entry parameters to OSRDRM.
* 03-Nov-2021 Temp'y fix, if can't find SROM, ignores it.
* 13-Nov-2021 ROMSELECT calls mainmem to load ROM.
* OSBYTE $80 - ADVAL
************************************
* Read input device or buffer status
BYTE80 LDY #$00 ; Prepare return=&00xx
TXA ; X<0 - info about buffers
BMI ADVALBUF ; X>=0 - read input devices
CPX #$7F
BNE ADVALNONE
ADVALWAIT JSR KBDREAD
BCS ADVALWAIT
TAX
BPL ADVALOK1 ; &00xx for normal keys
INY ; &01xx for function/edit keys
ADVALOK1 RTS
ADVALNONE LDX #$00 ; Input, just return 0
RTS
ADVALBUF INX
BEQ :ADVALKBD ; Fake keyboard buffer
INX
BEQ :ADVALOK ; Serial input, return 0
LDX #$01 ; For outputs, return 1 char free
RTS
:ADVALKBD BIT $C000 ; Test keyboard data/strobe
BPL :ADVALOK ; No Strobe, return 0
INX ; Strobe, return 1
:ADVALOK RTS
******************
* Helper functions
******************
* Beep
*
* Sound measurement shows the tone formula is:
* 1.230 MHz
* ------------- = cycles
* 8 * frequency
*
* cycles = BEEPX*5+10
*
* So:
* BEEPX = (cycles-10)/5
* So:
* BEEPX = ( 1.230 MHz )
* (------------- - 10 ) / 5
* (8 * frequency )
* BEEPX EQU #57 ; note=C5
BEEPX EQU #116 ; note=C4
BEEP PHA
PHX
PHY
LDY #$00 ; duration
:L1 LDX #BEEPX ; 2cy pitch 2cy
*------------------------------------------------------
:L2 DEX ; 2cy BEEPX * 2cy
BNE :L2 ; 3cy/2cy (BEEPX-1) * 3cy + 1 * 2cy
*------------------------------------------------------
* BEEPX*5-1cy
LDA $C030 ; 4cy BEEPX*5+5
DEY ; 2cy BEEPX*5+7
BNE :L1 ; 3cy/2cy BEEPX*5+10
PLY ;
PLX
PLA
RTS
* Print string pointed to by X,Y to the screen
OUTSTR TXA
* Print string pointed to by A,Y to the screen
PRSTR STA OSTEXT+0 ; String in A,Y
STY OSTEXT+1
:L1 LDA (OSTEXT) ; Ptr to string in OSTEXT
BEQ PRSTROK
JSR OSASCI
INC OSTEXT
BNE :L1
INC OSTEXT+1
BRA :L1
PRSTROK RTS
* Print NL if not already at column 0
FORCENL LDA #$86
JSR OSBYTE
TXA
BEQ PRSTROK
JMP OSNEWL
* Print XY in hex
OUT2HEX TYA
JSR OUTHEX
TXA ; Continue into OUTHEX
* Print hex byte in A
OUTHEX PHA
LSR
LSR
LSR
LSR
AND #$0F
JSR PRNIB
PLA
AND #$0F ; Continue into PRNIB
* Print hex nibble in A
PRNIB CMP #$0A
BCC :S1
CLC ; >= $0A
ADC #'A'-$0A
JSR OSWRCH
RTS
:S1 ADC #'0' ; < $0A
JMP OSWRCH
* TEMP ENTRY *
* Print 16-bit value in XY in decimal
OSNUM EQU OSTEXT+0
OSPAD EQU OSTEXT+4
*PRDECXY
*PRDECPAD STX OSNUM+0
* STY OSNUM+1
* STZ OSNUM+2
* STZ OSNUM+3
*:PRDEC16 LDY #$05 ; 5 digits
* LDX #OSNUM ; number stored in OSNUM
* Print up to 32-bit decimal number
* See forum.6502.org/viewtopic.php?f=2&t=4894
* and groups.google.com/g/comp.sys.apple2/c/_y27d_TxDHA
*
* X=>four byte zero page locations
* Y= number of digits to pad to, 0 for no padding
*
PRINTDEC sty OSPAD ; Number of padding+digits
ldy #0 ; Digit counter
PRDECDIGIT lda #32 ; 32-bit divide
sta OSTEMP
lda #0 ; Remainder=0
clv ; V=0 means div result = 0
PRDECDIV10 cmp #10/2 ; Calculate OSNUM/10
bcc PRDEC10
sbc #10/2+$80 ; Remove digit & set V=1 to show div result > 0
sec ; Shift 1 into div result
PRDEC10 rol 0,x ; Shift /10 result into OSNUM
rol 1,x
rol 2,x
rol 3,x
rol a ; Shift bits of input into acc (input mod 10)
dec OSTEMP
bne PRDECDIV10 ; Continue 32-bit divide
ora #48
pha ; Push low digit 0-9 to print
iny
bvs PRDECDIGIT ; If V=1, result of /10 was > 0 & do next digit
lda #32
PRDECLP1 cpy OSPAD
bcs PRDECLP2 ; Enough padding pushed
pha ; Push leading space characters
iny
bne PRDECLP1
PRDECLP2 pla ; Pop character left to right
jsr OSWRCH ; Print it
dey
bne PRDECLP2
rts
* GSINIT - Initialise for GSTRANS string parsing
************************************************
* On entry,
* (OSLPTR),Y=>start of string (spaces will be skipped)
* CLC = filename style parsing
* SEC = *KEY style parsing
* On exit,
* X = preserved
* Y = prepared for future calls to GSREAD
* EQ = end of line (nb: not "" null string)
* NE = not end of line
*
* Very difficult to write this without it being a direct clone
* from the BBC MOS. ;)
*
GSINTGO ROR GSFLAG ; CY initially into bit 7
JSR SKIPSPC ; Skip any spaces
INY ; Step past in case it's a quote
CMP #$22 ; Is it a quote?
BEQ GSINTGO1
DEY ; Wasn't a quote, step back
CLC ; Prepare CC=no leading quote
GSINTGO1 ROR GSFLAG ; Rotate 'leading-quote' into flags
CMP #$0D
RTS ; Return EQ if end of line
* GSFLAG set to:
* bit7: leading quote found
* bit6: CC=filename CS=*KEY
* GSREAD - Read a character from a GSTRANS parsed string
********************************************************
* On entry,
* (OSLPTR),Y=>current string pointer
* On exit,
* A = parsed character
* X = preserved
* CS = end of string (space or <cr> or ")
* Y =updated to start of next word or end of line
* EQ=end of line after this string
* NE=not end of line, more words follow
* CC = not end of string
* Y =updated for future calls to GSREAD
* VS=7-bit control character, (char AND $7F)<$20
* VC=not 7-bit control character (char AND $7F)>$1F
* EQ= char=$00, NE= char>$00
* PL= char<$80, MI= char>$7F
*
* No string present is checked for with:
* JSR GSINIT:BEQ missingstring
*
* A null string is checked for with:
* JSR GSINIT:JSR GSREAD:BCS nullstring
*
* A string is skipped with:
* JSR GSINIT
* loop
* JSR GSREAD:BCC loop
*
* A string is copied with:
* JSR GSINIT
* LDX #0
* loop
* JSR GSREAD:BCS done
* STA data,X
* INX:BNE loop
* done
*
GSRDGO LDA #$00 ; Prepare to clear accumulator
GSREADLP STA GSCHAR ; Update accumulator
LDA (OSLPTR),Y ; Get current character
CMP #$0D ; End of line?
BNE GSREAD2 ; No, check character
BIT GSFLAG
BPL GSREADEND ; We aren't waiting for a closing quote
* ; End of line before closing quote
ERRBADSTR BRK
DB $FD
ASC 'Bad string'
BRK
GSREAD2 CMP #' '
BCC ERRBADSTR ; Embedded control char
BNE GSREAD3 ; Not a space, process it
BIT GSFLAG ; Can space terminate string?
BMI GSREADCHAR ; We're waiting for a terminating quote
* ; so return the space character
BVC GSREADEND ; Space is a terminator, finish
GSREAD3 CMP #$22 ; Is it a quote?
BNE GSREADESC ; Not quote, check for escapes
BIT GSFLAG ; Was there an opening quote?
BPL GSREADCHAR ; Not waiting for a closing quote
INY ; Waiting for quote, check next character
LDA (OSLPTR),Y
CMP #$22 ; Is it another quote?
BEQ GSREADCHAR ; Quote-Quote, expand to single quote
* End of string
* Either closing quote, or a space seperator, or end of line
GSREADEND JSR SKIPSPC ; Skip any spaces to next word
SEC ; SEC=end of string
RTS ; and (OSLPTR),Y=>next word or end of line
* CS=end of string
* EQ=end of line
* NE=not end of line, more words follow
GSREADESC CMP #$7C ; Is it '|' escape character
BNE GSREADCHAR ; No, return as character
INY ; Step to next character
LDA (OSLPTR),Y
CMP #$7C
BEQ GSREADCHAR ; bar-bar expands to bar
CMP #$22
BEQ GSREADCHAR ; bar-quote expands to quote
CMP #'!' ; Is it bar-pling?
BNE GSREAD5 ; No, check for bar-letter
INY ; Step past it
LDA #$80 ; Set bit 7 in accumulator
BNE GSREADLP ; Loop back to check next character(s)
GSREAD5 CMP #'?' ; Check for '?'
BCC ERRBADSTR ; <'?', bad character
BEQ GSREADDEL ; bar-query -> DEL
AND #$1F ; Convert bar-letter to control code
BIT SETV ; SEV=control character
BVS GSREADOK
GSREADDEL LDA #$7F
GSREADCHAR CLV ; CLV=not control character
GSREADOK INY ; Step to next character
ORA GSCHAR ; Add in any bit 7 from |! prefix
CLC ; CLC=not end of string
RTS
* CC=not end of string
* VS=control character
* VC=not control character
* Read a byte from sideways ROM
* On entry, Y=ROM to read from
* On exit, A=byte read, X=current ROM, Y=$00
RDROM LDA $F4
PHA ; Save current ROM
TYA
TAX ; X=ROM to read from
JSR ROMSELECT ; Page in the required ROM
LDY #$00
LDA ($F6),Y ; Read the byte
PLX
* Select a sideways ROM
* X=ROM to select
* All registers must be preserved
ROMSELECT
* Insert code here for faking sideways ROMs by loading or otherwise
* fetching code to $8000. All registers must be preserved.
:ROMSEL PHP
PHA
PHX
PHY
TXA ; A=ROM to select
>>> XF2MAIN,SELECTROM
ROMSELDONE >>> ENTAUX
PLY
PLX
PLA
PLP
:ROMSELOK STX $F4 ; Set Current ROM number
RTS
ROMXX
* CPX $F8
* BEQ :ROMSELOK ; Already selected
*
** Insert code here for faking sideways ROMs by loading or otherwise
** fetching code to $8000. All registers must be preserved.
* CPX MAXROM
* BEQ :ROMSEL
* BCS :ROMSELOK ; Out of range, ignore
*:ROMSEL PHA
* PHX
* PHY
*
* LDA OSLPTR+0
* PHA
* LDA OSLPTR+1
* PHA
*
* TXA
* ASL A
* TAX
* LDA ROMTAB+0,X ; LSB of pointer to name
* STA OSFILECB+0
* LDA ROMTAB+1,X ; MSB of pointer to name
* STA OSFILECB+1
*
* LDX #<OSFILECB
* LDY #>OSFILECB
* LDA #$05 ; Means 'INFO'
* JSR OSFILE
* CMP #$01
* BNE :ROMNOTFND ; File not found
*
* STZ OSFILECB+2 ; Dest address $8000
* LDA #$80
* STA OSFILECB+3
* STZ OSFILECB+4
* STZ OSFILECB+5
* STZ OSFILECB+6 ; Load to specified address
* LDX #<OSFILECB
* LDY #>OSFILECB
* LDA #$FF ; Means 'LOAD'
* JSR OSFILE
*:ROMNOTFND
* PLA
* STA OSLPTR+1
* PLA
* STA OSLPTR+0
* PLY
* PLX
* PLA
* STX $F8 ; Set ROM loaded
*:ROMSELOK STX $F4 ; Set Current ROM number
EVENT RTS
*BASICROM ASC 'BASIC2.ROM'
* DB $0D,$00
*
*COMALROM ASC 'COMAL.ROM'
* DB $0D,$00
*
*LISPROM ASC 'LISP501.ROM'
* DB $0D,$00
*
*FORTHROM ASC 'FORTH103.ROM'
* DB $0D,$00
*
*PROLOGROM ASC 'MPROLOG310.ROM'
* DB $0D,$00
*
*BCPLROM ASC 'BCPL7.0.ROM'
* DB $0D,$00
*
*PASCROM1 ASC 'PASC.1.10.1.ROM'
* DB $0D,$00
*
*PASCROM2 ASC 'PASC.1.10.2.ROM'
* DB $0D,$00
*
* Initialize ROMTAB according to user selection in menu
ROMINIT STZ MAXROM ; One sideways ROM only
STA $C002 ; Read main mem
LDA USERSEL
STA $C003 ; Read aux mem
CMP #6
BNE :X1
INC MAXROM
:X1 CMP #7
BNE :X2
STA MAXROM
:X2 RTS
* ASL ; x2
* CLC
* ADC #<ROMS
* STA OSLPTR+0
* LDA #>ROMS
* ADC #$00
* STA OSLPTR+1
* LDY #$00
* LDA (OSLPTR),Y
* STA ROMTAB+0
* INY
* LDA (OSLPTR),Y
* STA ROMTAB+1
* STA $C002 ; Read main mem
* LDA USERSEL
* STA $C003 ; Read aux mem
* CMP #6 ; Menu entry 7 has two ROMs
* BNE :S1
* LDA #<PASCROM2
* STA ROMTAB+2
* LDA #>PASCROM2
* STA ROMTAB+3
* INC MAXROM ; Two ROMs
* BRA :DONE
*:S1 CMP #7 ; Menu entry 8
* BNE :DONE
* LDA #<PASCROM1
* STA ROMTAB+0
* LDA #>PASCROM1
* STA ROMTAB+1
* LDA #<PASCROM2
* STA ROMTAB+2
* LDA #>PASCROM2
* STA ROMTAB+3
* LDA #<LISPROM
* STA ROMTAB+4
* LDA #>LISPROM
* STA ROMTAB+5
* LDA #<FORTHROM
* STA ROMTAB+6
* LDA #>FORTHROM
* STA ROMTAB+7
* LDA #<PROLOGROM
* STA ROMTAB+8
* LDA #>PROLOGROM
* STA ROMTAB+9
* LDA #<BCPLROM
* STA ROMTAB+10
* LDA #>BCPLROM
* STA ROMTAB+11
* LDA #<COMALROM
* STA ROMTAB+12
* LDA #>COMALROM
* STA ROMTAB+13
* LDA #<BASICROM
* STA ROMTAB+14
* LDA #>BASICROM
* STA ROMTAB+15
* LDA #7 ; 8 sideways ROMs
* STA MAXROM
*:DONE LDA #$FF
* STA $F8 ; Force ROM to load
* RTS
*
** Active sideways ROMs
*ROMTAB DW $0000 ; ROM0
* DW $0000 ; ROM1
* DW $0000 ; ROM2
* DW $0000 ; ROM3
* DW $0000 ; ROM4
* DW $0000 ; ROM5
* DW $0000 ; ROM6
* DW $0000 ; ROM7
* DW $0000 ; ROM8
* DW $0000 ; ROM9
* DW $0000 ; ROMA
* DW $0000 ; ROMB
* DW $0000 ; ROMC
* DW $0000 ; ROMD
* DW $0000 ; ROME
* DW $0000 ; ROMF
*
** ROM filenames in same order as in the menu
** ROMMENU copies these to ROMTAB upon user selection
*ROMS DW BASICROM
* DW COMALROM
* DW LISPROM
* DW FORTHROM
* DW PROLOGROM
* DW BCPLROM
* DW PASCROM1
* DW PASCROM2
*EVENT LDA #<OSEVENM
* LDY #>OSEVENM
* JMP PRSTR
*OSEVENM ASC 'OSEVEN.'
* DB $00
**********************************************************
* Interrupt Handlers, MOS redirection vectors etc.
**********************************************************
* Invoked from GSBRK in main memory. On IIgs only.
GSBRKAUX >>> IENTAUX ; IENTAUX does not do CLI
* Continue into IRQBRKHDLR
* TO DO: Check, IENTAUX modifies X
* IRQ/BRK handler
IRQBRKHDLR PHA
* Mustn't enable IRQs within the IRQ handler
* Do not use WRTMAIN/WRTAUX macros
BIT $C014 ; Set N if aux write active
STA $C004 ; Write to main memory
STA $45 ; $45=A for ProDOS IRQ handlers
BPL :S1 ; If aux write wasn't active, skip
STA $C005 ; Write to aux memory
:S1 LDA GSSPEED ; See if GS was set to 2.8MHz
CMP #$80
BNE :S2 ; Nope, continue slow
TSB $C036 ; GS: Enable 'fast' speed
:S2 TXA
PHA
CLD
TSX
PHX
INX
INX
INX
LDA $100,X ; Get PSW from stack
AND #$10
BEQ :IRQ ; IRQ
SEC
INX
LDA $0100,X
SBC #$01
STA FAULT+0 ; FAULT=>error block after BRK
INX
LDA $0100,X
SBC #$00
STA FAULT+1
LDA $F4 ; Get current ROM
STA BYTEVARBASE+$BA ; Set ROM at last BRK
PLX
STX OSXREG ; Pass stack pointer
LDA #$06 ; Service Call 6 = BRK occured
JSR SERVICE
LDX BYTEVARBASE+$FC ; Get current language
JSR ROMSELECT ; Bring it into memory
PLA
TAX
PLA
JMP (BRKV) ; Pass on to BRK handler
:IRQ >>> XF2MAIN,A2IRQ ; Bounce to Apple IRQ handler
IRQBRKRET
>>> IENTAUX ; IENTAUX does not do CLI
PLA ; TODO: Pass on to IRQ1V
TAX
PLA
NULLRTI RTI
PRERR LDY #$01
PRERRLP LDA (FAULT),Y
BEQ PRERR1
JSR OSWRCH
INY
BNE PRERRLP
NULLRTS
PRERR1 RTS
MOSBRKHDLR LDA #<MSGBRK
LDY #>MSGBRK
JSR PRSTR
JSR PRERR
JSR OSNEWL
JSR OSNEWL
STOP JMP STOP ; Cannot return from a BRK
MSGBRK DB $0D
ASC 'ERROR: '
DB $00
* Default page 2 contents
DEFVEC DW NULLRTS ; $200 USERV
DW MOSBRKHDLR ; $202 BRKV
DW NULLRTI ; $204 IRQ1V
DW NULLRTI ; $206 IRQ2V
DW CLIHND ; $208 CLIV
DW BYTEHND ; $20A BYTEV
DW WORDHND ; $20C WORDV
DW WRCHHND ; $20E WRCHV
DW RDCHHND ; $210 RDCHV
DW FILEHND ; $212 FILEV
DW ARGSHND ; $214 ARGSV
DW BGETHND ; $216 BGETV
DW BPUTHND ; $218 BPUTV
DW GBPBHND ; $21A GBPBV
DW FINDHND ; $21C FINDV
DW FSCHND ; $21E FSCV
DW NULLRTS ; $220 EVENTV
DW NULLRTS ; $222
DW NULLRTS ; $224
DW NULLRTS ; $226
DW NULLRTS ; $228
DW NULLRTS ; $22A
DW NULLRTS ; $22C
DW NULLRTS ; $22E
DW NULLRTS ; $230 SPARE1V
DW NULLRTS ; $232 SPARE2V
DW NULLRTS ; $234 SPARE3V
ENDVEC
*
* Acorn MOS entry points at the top of RAM
* Copied from loaded code to high memory
*
* Base of API entries here in loaded code
MOSVEC
* Real base of API entries in real memory
MOSAPI EQU $FF95
ORG MOSAPI
* OPTIONAL ENTRIES
* ----------------
OSSERV JMP SERVICE ; FF95 OSSERV
OSCOLD JMP NULLRTS ; FF98 OSCOLD
OSPRSTR JMP OUTSTR ; FF9B OSPRSTR
OSSCANDEC JMP SCANDEC ; FF9E SCANDEC
OSSCANHEX JMP SCANHEX ; FFA1 SCANHEX
OSFFA4 JMP NULLRTS ; FFA4 (DISKACC)
OSFFA7 JMP NULLRTS ; FFA7 (DISKCCP)
PRHEX JMP OUTHEX ; FFAA PRHEX
PR2HEX JMP OUT2HEX ; FFAD PR2HEX
OSFFB0 JMP PRINTDEC ; FFB0 (USERINT)
OSWRRM JMP NULLRTS ; FFB3 OSWRRM
* COMPULSARY ENTRIES
* ------------------
VECSIZE DB ENDVEC-DEFVEC ; FFB6 VECSIZE Size of vectors
VECBASE DW DEFVEC ; FFB7 VECBASE Base of default vectors
OSRDRM JMP RDROM ; FFB9 OSRDRM Read byte from paged ROM
OSCHROUT JMP OUTCHAR ; FFBC CHROUT Send char to VDU driver
OSEVEN JMP EVENT ; FFBF OSEVEN Signal an event
GSINIT JMP GSINTGO ; FFC2 GSINIT Init string reading
GSREAD JMP GSRDGO ; FFC5 GSREAD Parse general string
NVWRCH JMP WRCHHND ; FFC8 NVWRCH Nonvectored WRCH
NVRDCH JMP RDCHHND ; FFCB NVRDCH Nonvectored RDCH
OSFIND JMP (FINDV) ; FFCE OSFIND
OSGBPB JMP (GBPBV) ; FFD1 OSGBPB
OSBPUT JMP (BPUTV) ; FFD4 OSBPUT
OSBGET JMP (BGETV) ; FFD7 OSBGET
OSARGS JMP (ARGSV) ; FFDA OSARGS
OSFILE JMP (FILEV) ; FFDD OSFILE
OSRDCH JMP (RDCHV) ; FFE0 OSRDCH
OSASCI CMP #$0D ; FFE3 OSASCI
BNE OSWRCH
OSNEWL LDA #$0A ; FFE7 OSNEWL
JSR OSWRCH
OSWRCR LDA #$0D ; FFEC OSWRCR
OSWRCH JMP (WRCHV) ; FFEE OSWRCH
OSWORD JMP (WORDV) ; FFF1 OSWORD
OSBYTE JMP (BYTEV) ; FFF4 OSBYTE
OSCLI JMP (CLIV) ; FFF7 OSCLI
NMIVEC DW NULLRTI ; FFFA NMIVEC
RSTVEC DW STOP ; FFFC RSTVEC
IRQVEC
* Assembler doesn't like running up to $FFFF, so we bodge a bit
MOSEND
ORG MOSEND-MOSAPI+MOSVEC
DW IRQBRKHDLR ; FFFE IRQVEC
MOSVEND
* Buffer for one 512 byte disk block in aux mem
AUXBLK ASC '**ENDOFCODE**'
DS $200-13
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