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33 lines
948 B
Plaintext
33 lines
948 B
Plaintext
processor 6502
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org $7ffe
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; 2-byte load address for ROM image
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word $8000
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; http://swut.net/c64cart-howto.html
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; https://codebase64.org/doku.php?id=base:assembling_your_own_cart_rom_image
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.word CartKReset ; cold start vector
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.word CartWStart ; warm start vector
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.byte $c3, $c2, $cd, $38, $30 ; "CBM80"
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CartKReset
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STX $D016 ; Turn on VIC for PAL / NTSC check
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JSR $FDA3 ; IOINIT - Init CIA chips
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JSR $FD50 ; RANTAM - Clear/test system RAM
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JSR $FD15 ; RESTOR - Init KERNAL RAM vectors
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JSR $FF5B ; CINT - Init VIC and screen editor
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CLI ; Re-enable IRQ interrupts
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CartBReset
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; init BASIC?
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IFCONST CART_INIT_BASIC
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JSR $E453 ; Init BASIC RAM vectors
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JSR $E3BF ; Main BASIC RAM Init routine
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JSR $E422 ; Power-up message / NEW command
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LDX #$FB
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TXS ; Reduce stack pointer for BASIC
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; don't init BASIC, just NOP
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ELSE
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REPEAT 12
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NOP
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REPEND
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ENDIF
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CartWStart
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; should be * = $x025
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