Don't work on C128. A bit surprisingly they don't seem to work with 8Mhz speedup too, even though the CPU should be stopped as soon as /IORQ is requested. The test program stores only zeros to $d020 (also - why zeros?).
Test code for Double-Ass:
10 *= $8000
20 .lis s
30 .obj memory
40 sei
50 lda $d505 :pha
60 lda $ff00 :pha
70 lda #$c3 :sta $ffee
80 lda #<z80 :sta $ffef
90 lda #>z80 :sta $fff0
100 lda #$3e :sta $ff00
110 lda #$00 :sta $d030
120 lda #$00 :sta $d020 :sta $d021
130 lda #$b0 :sta $d505
140 nop
150 pla :sta $ff00
160 pla :sta $d505
165 lda #$cf :sta $ffee
499 cli :rts
500 :
510 z80 .mod 1
515 :
520 jp testing
525 testdata:
530 .byt 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
535 testing:
537 ld de, $2000
542 outloop:
545 ld hl,testdata ; index of the test data
550 xor a ; zero the counter
555 tlp:
556 ld bc, $d020 ; border
560 outi ; send test data
570 inc a ; increment counter
580 cp 16 ; 16 bytes yet?
585 jp nz,tlp ; no, do more
590 dec de
595 jp outloop
999 jp $ffe0 ; back to 8502
A C128 hardware bug: https://dr.ea.ms/c128hardwarebug.html
OUTI OUTIR OUTD OUDR
Don't work on C128. A bit surprisingly they don't seem to work with 8Mhz speedup too, even though the CPU should be stopped as soon as /IORQ is requested. The test program stores only zeros to
$d020(also - why zeros?).Test code for Double-Ass:
RUNand start inMONITOR:J 08000