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52 lines
3.3 KiB
Plaintext
52 lines
3.3 KiB
Plaintext
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0 \ Z80-Portzugriff UH 05Nov86
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1
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2 Dieses File enthaelt Definitionen um die Z80-Ports ueber 16-Bit
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3 Adressen anzusprechen.
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4
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5 Einige Komputer, so die der Schneider Serie dekodieren ihre
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6 Ports etwas unkonventionell, sodass sie unbedingt ueber 16-Bit
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7 Adressen angesprochen werden muessen.
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8 Im allgemeinen sollte es ausreichen 8-Bit Adressen zu benutzen.
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0 \ Z80-Portaccess Extending 8080-Assembler UH 05Nov86
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2 Assembler definitions
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4 | : Z80-io ( base -- ) \ define special Z80-io instruction
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5 Create c,
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6 Does> ( reg -- ) $ED c, c@ swap 8 * + c, ;
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7
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8 $40 Z80-io (c)in
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9 $41 Z80-io (c)out
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11 Forth definitions
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13 -->
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0 \ store and fetch values with 16-bit port-adresses UH 05Nov86
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2 Code pc@ ( 16b -- 8b ) \ fetch 8-bit value from 16-bit port-addr
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3 H pop IP push H B mvx L (c)in 0 H mvi
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4 IP pop hpush jmp
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5 end-code
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6
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7 Code pc! ( 8b 16b -- ) \ store 8-bit value to 16-bit port-addr
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8 H pop D pop IP push H B mvx E (c)out
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9 IP pop Next
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10 end-code
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