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AltairZ80: VDM1 correct boot code, IO addressing

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Patrick Linstruth 2025-01-30 17:54:39 -05:00 committed by Mark Pizzolato
parent 68034af94a
commit 5cfa8662e9
1 changed files with 2 additions and 3 deletions
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5
AltairZ80/s100_vdm1.c
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@ -48,7 +48,6 @@
/*
** PORT ASSIGNMENTS
*/
#define VDM1_DSTAT 0xfe /* VDM DISPLAY PARAMETER PORT */
#define VDM1_DSTAT_RMSK 0xf0 /* START ROW MASK */
#define VDM1_DSTAT_CMSK 0x0f /* START COL MASK */
@ -391,7 +390,7 @@ static t_stat vdm1_boot(int32 unitno, DEVICE *dptr)
exdep_cmd(EX_D, "-m 14 DCX H");
exdep_cmd(EX_D, "-m 15 MOV A,H");
exdep_cmd(EX_D, "-m 16 ORA A");
exdep_cmd(EX_D, "-m 17 JNZ 0012H");
exdep_cmd(EX_D, "-m 17 JNZ 0014H");
exdep_cmd(EX_D, "-m 1A INR C");
exdep_cmd(EX_D, "-m 1B MOV B,C");
exdep_cmd(EX_D, "-m 1C JMP 0008H");
@ -402,7 +401,7 @@ static t_stat vdm1_boot(int32 unitno, DEVICE *dptr)
}
static int32 vdm1_io(const int32 port, const int32 io, const int32 data) {
if ((io == 1) && (port == VDM1_DSTAT)) {
if (io == 1) {
vdm1_dstat = data & 0xff;
}
return 0xff;