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collapseos/emul/8086/xcomp.fs
Virgil Dupras 705d68deec Move most of the high layer of comp core into the low one
With KEY and EMIT being switch words, most of the high layer can
be defined before drivers.

In addition to this change, I've compacted core blocks which were
becoming quite sparse.
2020-10-28 18:18:00 -04:00

27 lines
820 B
Forth

0xff00 CONSTANT RS_ADDR
0xfffa CONSTANT PS_ADDR
RS_ADDR 0x80 - CONSTANT SYSVARS
30 LOAD ( 8086 asm )
262 LOAD ( xcomp ) 270 LOAD ( xcomp overrides )
445 461 LOADR ( 8086 boot code )
353 LOAD ( xcomp core low )
CODE (emit) AX POPx, 1 INT, ;CODE
CODE (key) 2 INT, AH 0 MOVri, AX PUSHx, ;CODE
: COLS 80 ; : LINES 25 ;
CODE AT-XY ( x y ) BX POPx, AX POPx, 3 INT, ;CODE
CODE _ BX POPx, AX POPx, 4 INT, ;CODE
: EFS@ BLK( _ ;
CODE _ BX POPx, AX POPx, 5 INT, ;CODE
: EFS! BLK( _ ;
( 8086 port doesn't define PC@ and PC!, but test harness uses
it. Our forth binary uses INT 6 for retcode. )
CODE PC! AX POPx, ( discard ) AX POPx, 6 INT, ;CODE
390 LOAD ( xcomp core high )
(entry) _ ( Update LATEST ) PC ORG @ 8 + !
," BLK$ "
," ' EFS@ BLK@* ! "
," ' EFS! BLK!* ! "
EOT,
ORG @ 256 /MOD 2 PC! 2 PC!
H@ 256 /MOD 2 PC! 2 PC!