collapseos/recipes/sms/xcomp.fs
Virgil Dupras 1312817117 z80: make boot binary a 2-part process
Previously, recipes that began spitting binary contents before
loading block 282 would end up with VARIABLE code in their binary,
thus breaking them. We fix this by making this loading process
2-part.
2020-06-26 21:41:17 -04:00

38 lines
939 B
Forth

( 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
RAMSTART 0x70 + CONSTANT VDP_MEM
0xbf CONSTANT VDP_CTLPORT
0xbe CONSTANT VDP_DATAPORT
32 CONSTANT VDP_COLS
24 CONSTANT VDP_ROWS
RAMSTART 0x72 + CONSTANT PAD_MEM
0x3f CONSTANT PAD_CTLPORT
0xdc CONSTANT PAD_D1PORT
212 LOAD ( z80 assembler )
: ZFILL, ( u ) 0 DO 0 A, LOOP ;
262 LOAD ( xcomp )
524 LOAD ( font compiler )
282 LOAD ( boot.z80.decl )
270 LOAD ( xcomp overrides )
0x100 JPnn, 0x63 ZFILL, ( 0x66 )
RETN, 0x98 ZFILL, ( 0x100 )
( All set, carry on! )
CURRENT @ XCURRENT !
0x100 BIN( !
283 335 LOADR ( boot.z80 )
353 LOAD ( xcomp core low )
CREATE ~FNT CPFNT7x7
623 628 LOADR ( VDP )
632 637 LOADR ( PAD )
380 LOAD ( xcomp core high )
(entry) _
( Update LATEST )
PC ORG @ 8 + !
," VDP$ PAD$ " EOT,
ORG @ 0x100 - 256 /MOD 2 PC! 2 PC!
H@ 256 /MOD 2 PC! 2 PC!