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PDP11: Fixed writes to 11/70 RO registers

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This commit is contained in:
Tony Lawrence
2024-07-17 10:23:29 -10:00
committed by Mark Pizzolato
parent 9b1e541c8f
commit 6dc5ddd509
1 changed files with 11 additions and 1 deletions
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12
PDP11/pdp11_cpumod.c
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@@ -1,6 +1,6 @@
/* pdp11_cpumod.c: PDP-11 CPU model-specific features
Copyright (c) 2004-2022, Robert M Supnik
Copyright (c) 2004-2023, Robert M Supnik
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
@@ -25,6 +25,7 @@
system PDP-11 model-specific registers
10-Oct-23 RMS Fixed writes to 11/70 RO registers (Tony Lawrence)
19-Nov-22 RMS Fixed byte access errors in PIRQ, STKLIM, CDR (Walter Mueller)
15-Sep-20 RMS Fixed problem in KDJ11E programmable clock (Paul Koning)
04-Mar-16 RMS Fixed maximum memory sizes to exclude IO page
@@ -463,6 +464,12 @@ t_stat CPU44_wr (int32 data, int32 pa, int32 access)
{
switch ((pa >> 1) & 017) { /* decode pa<4:1> */
case 000: /* low error */
return SCPE_OK;
case 001: /* high error */
return SCPE_OK;
case 002: /* MEMERR */
MEMERR = 0;
return SCPE_OK;
@@ -480,6 +487,9 @@ switch ((pa >> 1) & 017) { /* decode pa<4:1> */
case 005: /* Hit/miss */
return SCPE_OK;
case 012: /* system ID */
return SCPE_OK;
case 013: /* CPUERR */
CPUERR = 0;
return SCPE_OK;