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52 lines
3.1 KiB
Forth
52 lines
3.1 KiB
Forth
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\ *** Block No. 0 Hexblock 0
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\ Z80-Portzugriff UH 05Nov86
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Dieses File enthaelt Definitionen um die Z80-Ports ueber 16-Bit
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Adressen anzusprechen.
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Einige Komputer, so die der Schneider Serie dekodieren ihre
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Ports etwas unkonventionell, sodass sie unbedingt ueber 16-Bit
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Adressen angesprochen werden muessen.
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Im allgemeinen sollte es ausreichen 8-Bit Adressen zu benutzen.
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\ *** Block No. 1 Hexblock 1
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\ Z80-Portaccess Extending 8080-Assembler UH 05Nov86
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Assembler definitions
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| : Z80-io ( base -- ) \ define special Z80-io instruction
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Create c,
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Does> ( reg -- ) $ED c, c@ swap 8 * + c, ;
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$40 Z80-io (c)in
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$41 Z80-io (c)out
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Forth definitions
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-->
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\ *** Block No. 2 Hexblock 2
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\ store and fetch values with 16-bit port-adresses UH 05Nov86
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Code pc@ ( 16b -- 8b ) \ fetch 8-bit value from 16-bit port-addr
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H pop IP push H B mvx L (c)in 0 H mvi
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IP pop hpush jmp
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end-code
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Code pc! ( 8b 16b -- ) \ store 8-bit value to 16-bit port-addr
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H pop D pop IP push H B mvx E (c)out
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IP pop Next
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end-code
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