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c8be290b88
I do this by adding an inverted version of all glyphs in the upper range of the pattern memory. This is a big waste of the pattern space (only one inverted character is needed at once), but it's the simplest way to proceed. I'll change this if I ever need more pattern space. Also, remove _blank. It was wastefully blanking the whole memory. Only the name table needs to be blanked on initialization.
45 lines
1.2 KiB
Forth
45 lines
1.2 KiB
Forth
( xcomp using the Text Mode if the VDP. Only works on actual
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SMS. The Megadrive's VDP doesn't have TMS9918 modes in it. )
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( 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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0xbf CONSTANT TMS_CTLPORT
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0xbe CONSTANT TMS_DATAPORT
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SYSVARS 0x70 + CONSTANT GRID_MEM
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SYSVARS 0x73 + CONSTANT CPORT_MEM
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0x3f CONSTANT CPORT_CTL
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0xdc CONSTANT CPORT_D1
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0xdd CONSTANT CPORT_D2
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SYSVARS 0x74 + CONSTANT PS2_MEM
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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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523 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 CPFNT5x7
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470 472 LOADR ( TMS9918 )
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402 404 LOADR ( Grid )
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625 626 LOADR ( SMS ports )
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620 LOAD ( PAD ) : (ps2kc) (ps2kcA) ; 411 414 LOADR
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622 LOAD ( SPI )
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1 CONSTANT SDC_DEVID 423 436 LOADR ( SDC )
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390 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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," TMS$ GRID$ PS2$ BLK$ ' SDC@ BLK@* ! (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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