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KA10: Account for MIT I/O Multiplexor in 340 Display CONI response

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Thanks to Lars for figuring it out!
This commit is contained in:
phil 2018-03-28 11:29:36 -04:00
parent 43581c1739
commit 40613cbd44
1 changed files with 9 additions and 2 deletions
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11
PDP10/ka10_dpy.c
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@ -227,8 +227,15 @@ t_stat dpy_devio(uint32 dev, uint64 *data) {
switch (dev & 3) {
case CONI:
*data = (uint64)(uptr->STAT_REG & CONI_MASK);
sim_debug(DEBUG_CONI, &dpy_dev, "DPY %03o CONI PC=%o %06o\n",
dev, PC, (uint32)*data);
/*
* MIT AI only, See Hardware Memo 1
* https://github.com/larsbrinkhoff/its-archives/blob/master/ailab/ITS_Hardware_Memo_1.pdf
* Set sign bit if device assigned to this CPU (KA or PDP-6)
* (Thanks to Lars for figuring this out!)
*/
*data |= SMASK; /* always assigned to us */
sim_debug(DEBUG_CONI, &dpy_dev, "DPY %03o CONI PC=%06o %012llo\n",
dev, PC, *data);
break;
case CONO: