Assembly ca65 version

This commit is contained in:
Michaelangel007 2016-08-18 17:42:31 -07:00
parent c382d4db28
commit f45c2b1ec3
2 changed files with 446 additions and 0 deletions

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ca65_fixes.inc Normal file
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; Version 2
; DB -> DFB
; ca65
.feature c_comments
.linecont +
.feature labels_without_colons
.feature leading_dot_in_identifiers
.PC02 ; 65C02
; Fix ca65's crappy out-of-the-box support for old assembler directives -- which are completely missing!
; Force APPLE 'text' to have high bit on
; Will display as NORMAL characters
.macro ASC text
.repeat .strlen(text), I
.byte .strat(text, I) | $80
.endrep
.endmacro
; Define Double Byte -- Big Endian, high-byte first, low-byte second
.macro DDB words
.endmacro
; Define Byte
.macro DFB byte1,byte2,byte3,byte4,byte5,byte6,byte7,byte8,byte9,byte10
.ifnblank byte1
.byte byte1
.endif
.ifnblank byte2
.byte byte2
.endif
.ifnblank byte3
.byte byte3
.endif
.ifnblank byte4
.byte byte4
.endif
.ifnblank byte5
.byte byte5
.endif
.ifnblank byte6
.byte byte6
.endif
.ifnblank byte7
.byte byte7
.endif
.ifnblank byte8
.byte byte8
.endif
.ifnblank byte9
.byte byte9
.endif
.ifnblank byte10
.byte byte10
.endif
.endmacro
.macro DW words
.word words
.endmacro
; DS 1
; DS 30, $A0
.macro DS length, fillval
.ifblank fillval
.res length
.else
.res length, fillval
.endif
.endmacro
; MAIN EQU *
.define equ =
.define EQU =
; ORG *+256
;
; DATA EQU *
; ORG DATA+256
.macro ORG address
; work around that
; .res address-*
; doesn't work due to bogus "Error: Constant expression expected"
.local _pc_
_pc_:
.if .const(_pc_)
.out .sprintf( "Current * = %04X, Reserving $%04X Bytes, New * = $%04X", _pc_, (address-_pc_), address )
.res (address - _pc_),$EA
.else
.org address
.endif
.endmacro

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; ASC
; DFB
.include "ca65_fixes.inc"
ZERO_LEAD EQU $00
KEY_CR EQU $8D
KEY_ESC EQU $9B
KEY_0 EQU $B0 ; '0' = $30
KEY_9 EQU $B9 ; '9' = $39
pDigits EQU $FA
Carry EQU $FC
Div EQU $FD
KEYBOARD EQU $C000
KEYSTROBE EQU $C010
TEXT EQU $FB2F ; Init text mode and window
HOME EQU $FC58
RDKEY EQU $FD0C
COUT EQU $FDED
__main = $2000
; Header for DOS 3.3 binary file; remove 2 lines for ProDOS
DW __main
DW __end - __main
; main()
ORG __main
LDA #7 ; Version
JSR TEXT ; Just in case we are in graphics mode
JSR HOME
JSR InitABS ; Init A,B,S
JSR IntroH
JSR InputA ; Input
JSR InputB
JSR IntroS
MulDigit ; Calc
JSR IsZeroB
BCS OutS
JSR IsOddB
BCC EvenS
JSR AddAToS
EvenS
JSR ShlA
JSR ShrB
CLC
BCC MulDigit ; ^ (always)
OutS
JSR PrintS ; output
;RTS ; NOTE: DOS3.3 BRUN bug doesn't exit, should JMP $3D0
JMP $0000
InputA
JSR IntroA
JSR GetPtrA
BNE GetString
InputB
JSR IntroB
JSR GetPtrB
; intentional fall int GetString
GetString ; common entry point
STX pDigits
STY pDigits+1
LDX #0 ; digits length
_linechar
JSR GetDigit ; C=1 enter, C=0 digit
BCS _linedone
JSR COUT ; preserves A,Y
AND #$F ; C=0 digit
STA Buffer,X
INX
BPL _linechar ; or BNE for 255 digits
BMI IntroE ; error if > 127 digits
_linedone ; Now move digits from $200 -> DigitsA, DigitsB, etc.
LDY #0 ; X = src, Y = dst offset
CPX #0 ; any digits?
BEQ _movedone ; No digits!
_moveline
DEX
LDA Buffer,X
STA (pDigits),Y ; digit[y] = char & 0xF
INY
CPX #0
BNE _moveline ; ^ max 256 digits
_movedone
BEQ PrintCR ; v (always)
GetDigit
; LDA KEYBOARD
; BPL GetDigit
; STA KEYSTROBE
JSR RDKEY
CMP #KEY_CR
BEQ _eol
CMP #KEY_ESC
BEQ _esc
CMP #KEY_0
BCC GetDigit
CMP #KEY_9+1
BCS GetDigit
RTS
_eol SEC ; C=1 enter
RTS
_esc ; Unwind stack of InputA/B
PLA
PLA
RTS ; Return to who originally called main()
GetPtrA
LDX #<DigitsA ; lo byte
LDY #>DigitsA ; hi byte
RTS
GetPtrB
LDX #<DigitsB
LDY #>DigitsB
RTS
GetPtrS
LDX #<DigitsS
LDY #>DigitsS
RTS
InitABS
LDA #$00
TAX
_zero
STA DigitsA,X
STA DigitsB,X
STA DigitsS,X
INX
BNE _zero ; zero digits[0..$FF]
RTS
IntroA LDY #OffsetA
BNE _intro
IntroB LDY #OffsetB
BNE _intro
IntroS LDY #OffsetS
BNE _intro
IntroE LDY #OffsetE
BNE _intro
IntroH
LDY #OffsetH
_intro
LDA _text,Y
BEQ _outro ; asciiz
JSR COUT
INY
BNE _intro
_outro
RTS
PrintCR
LDA #KEY_CR
JMP COUT
; ________________________________________________________________________
; Pseudo BCD - one byte per digit
; ________________________________________________________________________
; ========================================
PrintA
JSR GetPtrA
BNE _print
PrintB
JSR GetPtrB
BNE _print
PrintS
JSR GetPtrS
_print
STX _bcd+1
STY _bcd+2
LDX #ZERO_LEAD ; Default to leading zero ($0)
LDY #$FF ; start at digits[255]
_bcd
LDA $FFFF,Y ; NOTE: Self-Modified by _print
BNE _digit ; digits[i] == 0 && leadingzero
CPX #ZERO_LEAD ; X != 0
BEQ _skip
_digit
CLC
ADC #KEY_0 ; 0 -> $B0 .. 9 -> $B9
TAX ; If digit printed stop checking for leading zero
JSR COUT
_skip
DEY ;
CPY #$FF ; digits[255] ?
BNE _bcd ; ^
; Bug fix: If no digits were printed then number must be zero
LDA #0 ; print '0'
TAY ; no length
CPX #ZERO_LEAD
BEQ _digit
BNE PrintCR ; ^ (always) move to next line when done
; ========================================
AddAToS
LDY #0
CLC
_add
LDA DigitsS,Y
ADC DigitsA,Y
CMP #$A ; Base=10, C = (a+s+carry) >= 10
BCC _overflow
SBC #$A ; C=1, A = A - 9 - C
_overflow
STA DigitsS,Y
INY
BNE _add
RTS
; ========================================
IsOddB
LDY #0
LDA DigitsB,Y
AND #1
BEQ _not_zero ; Even -> C=0
BNE _is_zero ; Odd _> C=1
; ========================================
IsZeroB
LDY #0
_is_0
LDA DigitsB,Y
BNE _not_zero
INY
BNE _is_0
_is_zero
SEC
RTS
_not_zero
CLC
RTS
; ========================================
ShlA
LDY #0
CLC
_shl
LDA DigitsA,Y
TAX
LDA Mul2Digit,X
ADC #0
STA DigitsA,Y
LDA Mul2Carry,X
ROR
INY
BNE _shl
RTS
; ========================================
ShrB
LDY #$FF ; start at digits[255]
LDX #0 ; digits processed
STX Carry ; $00 .. 9*2 = $18
_shr
CLC ;
LDA DigitsB,Y ; sum = digit[i] + carry
ADC Carry ; A=0000_00xy C=0/1
ROR ; A=c000_000x, C=y
AND #$F ; A=0000_000x
STA DigitsB,Y ; digit[i] = (sum / 2)
LDA #0 ;
BCC _shr_next ; C=0 -> Carry = 0
LDA #10 ; C=1 -> Carry = 10 (base)
_shr_next
STA Carry ; carry = (sum & 1) ? BASE : 0
DEY
INX ; we need to compare y=$FF without disturbing carry
BNE _shr ; max 256 digits -- solution, use X reg :-)
RTS
Mul2Digit ; Digit
DFB 0 ; 0*2 = 0 0
DFB 2 ; 1*2 = 0 2
DFB 4 ; 2*2 = 0 4
DFB 6 ; 3*2 = 0 6
DFB 8 ; 4*2 = 0 8
DFB 0 ; 5*2 = 1 0
DFB 2 ; 6*2 = 1 2
DFB 4 ; 7*2 = 1 4
DFB 6 ; 8*2 = 1 6
DFB 8 ; 9*2 = 1 8
Mul2Carry ; Carry
DFB 0 ; 0*2 = 0 0
DFB 0 ; 1*2 = 0 2
DFB 0 ; 2*2 = 0 4
DFB 0 ; 3*2 = 0 6
DFB 0 ; 4*2 = 0 8
DFB 1 ; 5*2 = 1 0
DFB 1 ; 6*2 = 1 2
DFB 1 ; 7*2 = 1 4
DFB 1 ; 8*2 = 1 6
DFB 1 ; 9*2 = 1 8
_text
TextH ; Header
ASC "RUSSIAN PEASANT MULTIPLICATION"
DFB KEY_CR
DFB KEY_CR
DFB 0
TextA
ASC "INPUT A"
DFB KEY_CR
ASC "?"
DFB 0
TextB
ASC "INPUT B"
DFB KEY_CR
ASC "?"
DFB 0
TextE
DFB KEY_CR
ASC "WARNING"
ASC ": MORE THAN 127 CHARS"
DFB KEY_CR
DFB 0
TextS
ASC "= "
DFB 0
OffsetH EQU TextH - _text
OffsetA EQU TextA - _text
OffsetB EQU TextB - _text
OffsetE EQU TextE - _text
OffsetS EQU TextS - _text
__end
; Pad until end of page, these globals are not stored on disk
pad EQU 256 - <*
page EQU *+pad
DigitsA EQU page ; stupid assembler can't use variable 'a'
DigitsB EQU page+256
DigitsS EQU page+512
Buffer EQU page+768