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705d68deec
With KEY and EMIT being switch words, most of the high layer can be defined before drivers. In addition to this change, I've compacted core blocks which were becoming quite sparse.
39 lines
976 B
Forth
39 lines
976 B
Forth
( 8K of onboard RAM )
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0xdd00 CONSTANT RS_ADDR
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( Memory register at the end of RAM. Must not overwrite )
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0xddca CONSTANT PS_ADDR
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RS_ADDR 0x80 - CONSTANT SYSVARS
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0xc000 CONSTANT HERESTART
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SYSVARS 0x70 + CONSTANT VDP_MEM
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0xbf CONSTANT VDP_CTLPORT
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0xbe CONSTANT VDP_DATAPORT
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32 CONSTANT VDP_COLS
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24 CONSTANT VDP_ROWS
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SYSVARS 0x72 + CONSTANT PAD_MEM
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0x3f CONSTANT PAD_CTLPORT
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0xdc CONSTANT PAD_D1PORT
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5 LOAD ( z80 assembler )
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: ZFILL, ( u ) 0 DO 0 A, LOOP ;
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262 LOAD ( xcomp )
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524 LOAD ( font compiler )
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282 LOAD ( boot.z80.decl )
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270 LOAD ( xcomp overrides )
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DI, 0x100 JP, 0x62 ZFILL, ( 0x66 )
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RETN, 0x98 ZFILL, ( 0x100 )
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( All set, carry on! )
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CURRENT @ XCURRENT !
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0x100 BIN( !
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283 335 LOADR ( boot.z80 )
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353 LOAD ( xcomp core low )
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CREATE ~FNT CPFNT7x7
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603 608 LOADR ( VDP )
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612 617 LOADR ( PAD )
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390 LOAD ( xcomp core high )
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(entry) _
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( Update LATEST )
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PC ORG @ 8 + !
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," VDP$ PAD$ (im1) " EOT,
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ORG @ 0x100 - 256 /MOD 2 PC! 2 PC!
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H@ 256 /MOD 2 PC! 2 PC!
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