6 May
2016
6 May
'16
6:26 a.m.
From: Mattis Lind
Has anyone dumped the microcode of the PDP-11/05?
...
When tracing the microprogram flow it looks very suspicious. Comparing
the same sequence with a better working pair reveal a few differences.
All these can be narrowed down to one single PROM chip.
Josh had an 11/05 that had a uROM fail, and he had to blow a new one (IIRC he
sent in a report, it's in the list archive). I'm not sure if it's the same
one
as the one you need, but if his post doesn't give the chip ID, no doubt he can
let us know.
There are microcode listings in the manual but they
need to be treated
to get into a dump.
Which is exactly what Josh did.
Speaking of which, is there any chance we can get those machine-readable
listings online? I can host them with my other DEC material, and I can also
put them in the Computer History wiki.
Noel
10:03 a.m.
fredag 6 maj 2016 skrev william degnan <billdegnan at gmail.com>:
No, it is not a typo. Why do you think it is typo?
http://bitsavers.trailing-edge.com/pdf/dec/pdp11/1105/1105_RevAH_Engineerin…
Page 91. M7261. E102 / A04A2.
When comparing my chip, which I removed and dumped, it is very different
I would need a
dump of the chips or at least A04A2 / E102 on the Control
board.
Can you clarify? Is this a typo?
from the listing. Maybe half the chip differs. The
problems in the
microcode flow definetely matches the contents of the dump.
I am getting a little worried that there are different versions of the
microcode. Anyone knows of different versions?
/Mattis
Bill
9:09 a.m.
On 5/6/16 6:26 AM, Noel Chiappa wrote:
I had two uCode ROMs fail, it was just that fun. Unfortunately they
were at E114 and E102 (A11A2 and A20A2), not E103 so my transcriptions
aren't going to help.
I've put them up at http://yahozna.dyndns.org/scratch/pdp1105/ucode if
anyone happens to need them, this includes the raw binary as well as the
transcription I did. I had my wife double-check my work (she's very
patient with me) and the PROMs seem to work fine (all diags pass) so I'm
pretty sure they're correct.
Note that the order of the data in the A11A2 PROM is reversed from the
engineering drawing transcription; the address lines to that PROM are
active low (discovered this the hard way.)
- Josh
From: Mattis
Lind
Has anyone dumped the microcode of the
PDP-11/05?
...
When tracing the microprogram flow it looks very suspicious. Comparing
the same sequence with a better working pair reveal a few differences.
All these can be narrowed down to one single PROM chip.
Josh had an 11/05 that had a uROM fail, and he had to blow a new one (IIRC he
sent in a report, it's in the list archive). I'm not sure if it's the same
one
as the one you need, but if his post doesn't give the chip ID, no doubt he can
let us know. There are microcode listings in the manual but
they need to be treated
to get into a dump.
Which is exactly what Josh did.
Speaking of which, is there any chance we can get those machine-readable
listings online? I can host them with my other DEC material, and I can also
put them in the Computer History wiki.
Noel
10:16 a.m.
fredag 6 maj 2016 skrev Josh Dersch <derschjo at gmail.com>:
/Mattis
On 5/6/16 6:26 AM, Noel Chiappa wrote:
I had two uCode ROMs fail, it was just that fun. Unfortunately they were
at E114 and E102 (A11A2 and A20A2), not E103 so my transcriptions aren't
going to help.
Now this is confusing. Maybe this related to why Bill thought I made a
typo. In the schematic I have which is the same as the one at bitsavers:
http://bitsavers.trailing-edge.com/pdf/dec/pdp11/1105/1105_RevAH_Engineerin…
E102 / A04A2, E112 / A10A2, E103 / A20A2 and E114 / A11A2.
Are there plenty of different versions of PCB and microcode??
From:
Mattis Lind
Has anyone dumped the microcode of the
PDP-11/05?
...
When tracing the microprogram flow it looks very suspicious.
Comparing
the same sequence with a better working pair
reveal a few
differences.
All these can be narrowed down to one single PROM
chip.
Josh had an 11/05 that had a uROM fail, and he had to blow a new one
(IIRC he
sent in a report, it's in the list archive). I'm not sure if it's the
same one
as the one you need, but if his post doesn't give the chip ID, no doubt
he can
let us know.
2:36 p.m.
Mattis wrote
In the schematic I have which is the same as the
one at bitsavers:
http://bitsavers.trailing-edge.com/pdf/dec/pdp11/1105/1105_RevAH_Engineerin…
E102 / A04A2, E112 / A10A2, E103 / A20A2 and E114 / A11A2.
Are there plenty of different versions of PCB and microcode??
/Mattis
When I recovered the Foxboro Fox 2 and waterlogged 11/05 on my recent road trip, I was
lucky to
find an original 11/05 print set dated 1973. For what it's worth, the microcode
listing in my doc
is Revision B and it is *exactly* the same printout as in the the Bitsavers doc Revision C
except
it is more legible and has fewer splotches and spots on it. The only other difference I
can see
is the Rev C listing has the 'digital' logo added to the page edges.
By the way the above pdf is missing a page that is in my set, namely to do with the
5-1/4" height
power supply (H726-B) pictures, as well as some other pages of the chassis, possibly more
but I
haven't gone through it that closely.
Steve.
3103
days inactive
3103
days old
5 comments
5 participants
participants (5)
-
billdegnan＠gmail.com -
derschjo＠gmail.com -
jnc＠mercury.lcs.mit.edu -
mattislind＠gmail.com -
steven＠malikoff.com