mirror of https://github.com/hsoft/collapseos.git
35 lines
698 B
Forth
35 lines
698 B
Forth
( Addressed devices.
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Abstractions to read and write to devices that allow addressed
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access. At all times, we have one active "fetch" device and
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one active "store" device, A@ and A!.
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Those words have the same signature as C@ and C!, and in fact,
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initially default to proxy of those words.
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)
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: ADEVMEM+ 0x55 RAM+ @ + ;
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: A@* 0 ADEVMEM+ ;
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: A!* 2 ADEVMEM+ ;
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: ADEV$
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H@ 0x55 RAM+ !
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4 ALLOT
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['] C@ A@* !
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['] C! A!* !
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;
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: A@ A@* @ EXECUTE ;
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: A! A!* @ EXECUTE ;
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( Same as MOVE, but with A@ and A! )
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( src dst u -- )
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: AMOVE
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( u ) 0 DO
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SWAP DUP I + A@ ( dst src x )
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ROT SWAP OVER I + ( src dst x dst )
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A! ( src dst )
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LOOP
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2DROP
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;
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