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7d568bd782
Add _TRA!, _THA!, _TRB!, _THB! routines to easily handle those pins' value without stepping on other pins like the drivers previously did. For SDC driver, it's going to be important soon because it turns out that I can't get away with "always on" CS, so I'll need a scheme where it's important that TH/TR pins have stable values.
45 lines
1.2 KiB
Forth
45 lines
1.2 KiB
Forth
( xcomp for a SMS with PS/2 keyboard on port A and SPI relay
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on port B, with SD card attached )
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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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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 PS2_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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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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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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," VDP$ PS2$ 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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