29 May
2012
29 May
'12
6:18 p.m.
Date: Tue, 29 May 2012 12:22:23 +0200 (CEST) From: Christian Corti
<cc at informatik.uni-stuttgart.de> To: "General Discussion: On-Topic and
Off-Topic Posts" <cctalk at classiccmp.org> Subject: Re: PDP-11/05 Control
(M7261) won't deposit Message-ID:
<alpine.DEB.2.02.1205291219530.8955 at linuxserv.home> Content-Type:
TEXT/PLAIN; charset=US-ASCII; format=flowed On Sun, 27 May 2012, Jon
Elson wrote:
Stop, the 11/10 and 11/05 are fully microcoded machines. So much that even
the minimalistic switch front panel is handled in the CPU microcode. I've
learned that when I repaired our 11/10.
Oh, yeah! NOW I remember what an 11/05 is, the really short (3U?) machine
with the single-line front panel. YES, for some reason I was thinking of
the 11/20 or whatever the first model was. You are certainly right about
it being microcoded including the front panel control. I did work on an
11/05 about 1980 or so. We moved up to a used 11/45 and then got a
VAX 780.
Jon
> >> Working on a PDP-11/05. The front panel
appears to work, I can step through
>
[...]
is likely the
write command is not getting to the memory. There are a
bunch of ways to make a front panel work, but since this is a raw logic
machine (no microcode) they probably worked hard to minimize the logic