34 lines
804 B
Forth
34 lines
804 B
Forth
( 8K of onboard RAM )
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0xc000 CONSTANT RAMSTART
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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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RAMSTART 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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212 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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270 LOAD ( xcomp overrides )
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0x100 JPnn, 0x63 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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282 LOAD ( boot.z80 )
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393 LOAD ( xcomp core low )
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CREATE ~FNT CPFNT7x7
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623 628 LOADR ( VDP )
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: (key) 4 ;
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420 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$ " 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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