20 Jan
2019
20 Jan
'19
1:47 p.m.
Some further info on the parity halt/trap thing:
Digging again this morning for what I saw yesterday, it does look like it's a MS11
fastbus thing. The EHA/EHB bits are described in the Jan 1973 version of the 11/45 MS11
maintenance manual (table 3-12, describing the parity register), but they have been
scrubbed out by the time of the Jan 1974 printing of the same manual!
Somewhere yesterday I saw an actual register layout drawing that had these bits, but
I'm not able to find it again this afternoon so far...
--FritzM.