collapseos/arch/z80/sms/xcomptextmode.fs

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( xcomp using the Text Mode if the VDP. Only works on actual
SMS. The Megadrive's VDP doesn't have TMS9918 modes in it. )
( 8K of onboard RAM )
0xdd00 CONSTANT RS_ADDR
( Memory register at the end of RAM. Must not overwrite )
0xddca CONSTANT PS_ADDR
RS_ADDR 0x80 - CONSTANT SYSVARS
0xc000 CONSTANT HERESTART
0xbf CONSTANT TMS_CTLPORT
0xbe CONSTANT TMS_DATAPORT
SYSVARS 0x70 + CONSTANT GRID_MEM
SYSVARS 0x73 + CONSTANT CPORT_MEM
0x3f CONSTANT CPORT_CTL
0xdc CONSTANT CPORT_D1
0xdd CONSTANT CPORT_D2
SYSVARS 0x74 + CONSTANT PS2_MEM
5 LOAD ( z80 assembler )
: ZFILL, ( u ) 0 DO 0 A, LOOP ;
262 LOAD ( xcomp )
523 LOAD ( font compiler )
282 LOAD ( boot.z80.decl )
270 LOAD ( xcomp overrides )
DI, 0x100 JP, 0x62 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 CPFNT5x7
470 472 LOADR ( VDP )
402 404 LOADR ( Grid )
625 626 LOADR ( SMS ports )
620 LOAD ( PAD ) : (ps2kc) (ps2kcA) ; 411 414 LOADR
622 LOAD ( SPI )
1 CONSTANT SDC_DEVID 423 436 LOADR ( SDC )
390 LOAD ( xcomp core high )
(entry) _
( Update LATEST )
PC ORG @ 8 + !
," TMS$ GRID$ PS2$ BLK$ ' SDC@ BLK@* ! (im1) " EOT,
ORG @ 0x100 - 256 /MOD 2 PC! 2 PC!
H@ 256 /MOD 2 PC! 2 PC!