mirror of
https://github.com/badvision/lawless-legends.git
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80 lines
1.3 KiB
Plaintext
80 lines
1.3 KiB
Plaintext
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;
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; Handy constants.
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;
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const FALSE = 0
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const TRUE = !FALSE
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;
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; Hardware addresses.
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;
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const keyboard = $C000
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const keystrobe = $C010
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;
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; call() return register structure.
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;
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const Accum = 0
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const Xreg = 1
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const Yreg = 2
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const Preg = 3
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;
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; Processor Status (Preg) flag bits.
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;
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const Cflag = $01
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const Zflag = $02
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const Iflag = $04
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const Dflag = $08
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const Bflag = $10
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const Vflag = $40
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const Sflag = $80
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;
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; CALL 6502 ROUTINE
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; CALL(ADDR, AREG, XREG, YREG, STATUS)
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;
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asm call
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REGVALS = SRC
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PHP
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LDA ESTKL+4,X
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STA TMPL
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LDA ESTKH+4,X
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STA TMPH
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LDA ESTKL,X
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PHA
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LDA ESTKL+1,X
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TAY
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LDA ESTKL+3,X
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PHA
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LDA ESTKL+2,X
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INX
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INX
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INX
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INX
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STX ESP
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TAX
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PLA
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BIT ROMEN
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PLP
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JSR JMPTMP
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PHP
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BIT LCRDEN+LCBNK2
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STA REGVALS+0
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STX REGVALS+1
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STY REGVALS+2
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PLA
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STA REGVALS+3
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LDX ESP
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LDA #<REGVALS
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LDY #>REGVALS
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STA ESTKL,X
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STY ESTKH,X
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PLP
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RTS
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JMPTMP JMP (TMP)
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end
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;
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; Main loop.
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;
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call($FDF0, 65, 0, 0, 0)
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call($FDF0, 65, 0, 0, 0)
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call($FDF0, 65, 0, 0, 0)
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call($FDF0, 13+128, 0, 0, 0)
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done
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