mirror of https://github.com/hsoft/collapseos.git
59 lines
1015 B
Forth
59 lines
1015 B
Forth
( I/O blocks )
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: BLKMEM+ 0x57 RAM+ @ + ;
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( n -- Fetches block n and write it to BLK( )
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: BLK@* 0 BLKMEM+ ;
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( n -- Write back BLK( to storage at block n )
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: BLK!* 2 BLKMEM+ ;
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( Current blk pointer in ( )
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: BLK> 4 BLKMEM+ ;
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( backup for CINPTR when LOADing )
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: BLKC<* 6 BLKMEM+ ;
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: BLK( 8 BLKMEM+ ;
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: BLK$
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H@ 0x57 RAM+ !
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( 1024 for the block, 8 for variables )
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1032 ALLOT
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( LOAD detects end of block with ASCII EOT. This is why
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we write it there. EOT == 0x04 )
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4 C,
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-1 BLK> !
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;
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: BLK@
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DUP BLK> = IF DROP EXIT THEN
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DUP BLK> ! BLK@* @ EXECUTE
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;
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: .2 DUP 10 < IF SPC THEN . ;
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: LIST
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BLK@
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16 0 DO
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I 1 + .2 SPC
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64 I * BLK( + (print)
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CRLF
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LOOP
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;
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: _
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(boot<)
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DUP 4 = IF
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DROP
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( We're finished interpreting )
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BLKC<* @ 0x0c RAM+ !
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C<
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THEN
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;
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: LOAD
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BLK@
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( 2e == BOOT C< PTR )
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BLK( 0x2e RAM+ !
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( Save current C< ptr )
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0x0c RAM+ @ BLKC<* !
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( 0c == CINPTR )
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['] _ 0x0c RAM+ !
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;
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