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17 lines
696 B
Plaintext
17 lines
696 B
Plaintext
( Routines for interacting with SMS controller ports.
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Requires CPORT_MEM, CPORT_CTL, CPORT_D1 and CPORT_D2 to be
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defined. CPORT_MEM is a 1 byte buffer for CPORT_CTL. The last
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3 consts will usually be 0x3f, 0xdc, 0xdd. )
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( mode -- set TR pin on mode a on:
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0= output low 1=output high 2=input )
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CODE _TRA! HL POP, chkPS, ( B0 -> B4, B1 -> B0 )
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L RR, RLA, RLA, RLA, RLA, L RR, RLA,
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0x11 ANDi, L A LDrr, CPORT_MEM LDA(i),
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0xee ANDi, L ORr, CPORT_CTL OUTiA, CPORT_MEM LD(i)A,
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;CODE
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CODE _THA! HL POP, chkPS, ( B0 -> B5, B1 -> B1 )
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L RR, RLA, RLA, RLA, RLA, L RR, RLA, RLA,
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0x22 ANDi, L A LDrr, CPORT_MEM LDA(i),
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0xdd ANDi, L ORr, CPORT_CTL OUTiA, CPORT_MEM LD(i)A,
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;CODE
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