collapseos/recipes/sms/xcomp.fs

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2020-05-14 22:15:31 -04:00
( 8K of onboard RAM )
0xc000 CONSTANT RAMSTART
0xdd00 CONSTANT RS_ADDR
( Memory register at the end of RAM. Must not overwrite )
0xddca CONSTANT PS_ADDR
0xbf CONSTANT VDP_CTLPORT
0xbe CONSTANT VDP_DATAPORT
32 CONSTANT VDP_COLS
24 CONSTANT VDP_ROWS
212 LOAD ( z80 assembler )
: ZFILL, ( u ) 0 DO 0 A, LOOP ;
262 LOAD ( xcomp )
524 LOAD ( font compiler )
270 LOAD ( xcomp overrides )
0x100 JPnn, 0x63 ZFILL, ( 0x66 )
RETN, 0x98 ZFILL, ( 0x100 )
( All set, carry on! )
CURRENT @ XCURRENT !
0x100 BIN( !
282 LOAD ( boot.z80 )
393 LOAD ( xcomp core low )
CREATE ~FNT CPFNT7x7
623 627 LOADR ( VDP )
: (key) 0 ; : (emit) DROP ;
420 LOAD ( xcomp core high )
(entry) _
( Update LATEST )
PC ORG @ 8 + !
," VDP$ BYE "
ORG @ 0x100 - 256 /MOD 2 PC! 2 PC!
H@ 256 /MOD 2 PC! 2 PC!