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6b895d0745
I'm not sure if not setting IM 1 explicitly can be the source of bugs, but SMS Power's tutorial mentions that everyone is doing it, so...
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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380 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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