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This would be useful, for example, to allow the assembler to write straight to an AT28 EEPROM without going to RAM. This would be a life saver in machines with tight RAM such as the SMS.
17 lines
525 B
Plaintext
17 lines
525 B
Plaintext
( Splits word into msb/lsb, lsb being on TOS )
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: SPLITB
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256 /MOD SWAP
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;
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: PC H@ ORG @ - BIN( @ + ;
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( A, spits an assembled byte, A,, spits an assembled word
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Both increase PC. )
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: A,, SPLITB A, A, ;
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: <<3 3 LSHIFT ; : <<4 4 LSHIFT ;
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( As a general rule, IX and IY are equivalent to spitting an
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extra 0xdd / 0xfd and then spit the equivalent of HL )
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: IX 0xdd A, HL ; : IY 0xfd A, HL ;
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: _ix+- 0xff AND 0xdd A, (HL) ;
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: _iy+- 0xff AND 0xfd A, (HL) ;
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: IX+ _ix+- ; : IX- 0 -^ _ix+- ;
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: IY+ _iy+- ; : IY- 0 -^ _iy+- ;
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