collapseos/arch/z80/sms/xcompkbd.fs
Virgil Dupras 7d568bd782 sms: simplify and solidify ports-related drivers
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.
2020-11-02 18:53:57 -05:00

42 lines
1.1 KiB
Forth

( xcomp for a SMS with PS/2 keyboard on port A )
( 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
SYSVARS 0x70 + CONSTANT VDP_MEM
0xbf CONSTANT VDP_CTLPORT
0xbe CONSTANT VDP_DATAPORT
32 CONSTANT VDP_COLS
24 CONSTANT VDP_ROWS
SYSVARS 0x72 + CONSTANT PS2_MEM
0x3f CONSTANT CPORT_CTL
0xdc CONSTANT CPORT_D1
0xdd CONSTANT CPORT_D2
5 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 )
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 CPFNT7x7
603 608 LOADR ( VDP )
625 626 LOADR ( SMS ports )
620 LOAD ( PAD ) : (ps2kc) (ps2kcA) ; 411 414 LOADR
390 LOAD ( xcomp core high )
(entry) _
( Update LATEST )
PC ORG @ 8 + !
," VDP$ PS2$ (im1) " EOT,
ORG @ 0x100 - 256 /MOD 2 PC! 2 PC!
H@ 256 /MOD 2 PC! 2 PC!