collapseos/recipes/sms/xcomp.fs

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( 8K of onboard RAM )
0xdd00 CONSTANT RS_ADDR
( Memory register at the end of RAM. Must not overwrite )
0xddca CONSTANT PS_ADDR
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RS_ADDR 0x80 - CONSTANT SYSVARS
0xc000 CONSTANT HERESTART
SYSVARS 0x70 + CONSTANT VDP_MEM
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0xbf CONSTANT VDP_CTLPORT
0xbe CONSTANT VDP_DATAPORT
32 CONSTANT VDP_COLS
24 CONSTANT VDP_ROWS
SYSVARS 0x72 + CONSTANT PAD_MEM
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0x3f CONSTANT PAD_CTLPORT
0xdc CONSTANT PAD_D1PORT
5 LOAD ( z80 assembler )
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: ZFILL, ( u ) 0 DO 0 A, LOOP ;
262 LOAD ( xcomp )
524 LOAD ( font compiler )
282 LOAD ( boot.z80.decl )
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270 LOAD ( xcomp overrides )
DI, 0x100 JP, 0x62 ZFILL, ( 0x66 )
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RETN, 0x98 ZFILL, ( 0x100 )
( All set, carry on! )
CURRENT @ XCURRENT !
0x100 BIN( !
283 335 LOADR ( boot.z80 )
353 LOAD ( xcomp core low )
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CREATE ~FNT CPFNT7x7
603 608 LOADR ( VDP )
612 617 LOADR ( PAD )
380 LOAD ( xcomp core high )
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(entry) _
( Update LATEST )
PC ORG @ 8 + !
," VDP$ PAD$ (im1) " EOT,
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ORG @ 0x100 - 256 /MOD 2 PC! 2 PC!
H@ 256 /MOD 2 PC! 2 PC!