8 Jun
2019
8 Jun
'19
7:37 p.m.
From: Allison
ODT for the two systems are very different. .. KDF-11
the ODT is part
of the higher level code. The larger cards (11/23 and 23+) boot to
resident (ep)rom.
Ah, no. (Well, the KDF11 CPU's can boot to EPROM, which in the -11/23+ can be
on the CPU card; the -11/23 is a dual card and has no functionality on the CPU
card except the CPU.)
The ODT in the KDF11's (and KDJ11's) is, just like in the LSI-11's,
microcode, not macro-code. From the 1982 'microcomputers and memories'
handbook, pg. 161 (in Chapter 7, "Octal Debugging Technique (Microcode
ODT)"):
"The console emulator Octal Debugging Technique (ODT)is a portion of
the processor microcode ... The console ODT implemented on the LSI-11/23,
PDP-11/23 and PDP-11/23-PLUS is identical."
and on pg. 154:
"Unlike the LSI-11 and LSI-11/2, the LSI-11/23 does not enter console
ODT upon occurrence of a double bus error"
From which I think is quite clear that the KDF11's
have microcode ODT.
Noel