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PDP11: Properly validate the number of VH lines after a bus type change

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If the number of lines on a Qbus system has previously been changed
to an odd multiple of and then the bus type changed to Unibus, we
to change the number of lines to a multiple of 16 for the DHU.
This commit is contained in:
Mark Pizzolato
2022-07-19 05:18:37 -10:00
parent 5c301b0a8c
commit 69a92622be
1 changed files with 9 additions and 0 deletions
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9
PDP11/pdp11_vh.c
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@@ -1663,6 +1663,15 @@ static t_stat vh_reset ( DEVICE *dptr )
tmxr_set_port_speed_control (&vh_desc);
tmxr_set_modem_control_passthru (&vh_desc);
/* If the number of lines on a Qbus system has previously been changed */
/* to an odd multiple of and then the bus type changed to Unibus, we */
/* to change the number of lines to a multiple of 16 for the DHU */
if (vh_desc.lines%VH_LINES != 0) {
char lines[12];
snprintf (lines, sizeof (lines), "%d", vh_desc.lines + (VH_LINES / 2));
return vh_setnl (dptr->units, 0, lines, NULL);
}
if (vh_desc.lines > VH_MUXES*VH_LINES)
vh_desc.lines = VH_MUXES*VH_LINES;
vh_dev.numunits = (vh_desc.lines / VH_LINES) + 3;