4 Feb
2007
4 Feb
'07
5:36 p.m.
on 1/24/07 11:45 AM, J. David Bryan at jdbryan at acm.org wrote:
There are several numbers on the center board:
5080-9740
5060-8380
A-3516-22
809L
Here's a photo of its ROMs:
http://home.comcast.net/~richardlynch3/hp/ctrl_str_roms.jpg
My assumption about 12978A being installed as a ROM was wrong. The three
ROMs all have 12992 on them, the first in light pencil (not visible in the
picture below), the others with a label as shown here:
http://home.comcast.net/~richardlynch3/hp/opt_roms.jpg
Why are U13 and U15 both labeled "80009"? Are they the same chip or is that
a date code?
I found a manual for the 12978a on bitsavers:
http://bitsavers.vt100.net/hp/1000/Diagnostics/12908-90013_Aug-1976.pdf
I'm not sure if the paper tape loader ROM is present. U12 is empty - is
this where it was supposed to go:
http://home.comcast.net/~richardlynch3/hp/u12.jpg
One more photo of the numbers on the CPU board:
http://home.comcast.net/~richardlynch3/hp/cpu_nums.jpg
Richard
On 13 Jan 2007 at 10:00, Richard Lynch wrote:
yes, it has both of those.
In the front there is the DCPC, Memory
Protection, M.E.M. (Memory
Extension Module), 3 memory cards and Memory Controller.
Also, there should be a ribbon cable from the DCPC card to the memory-I/O
crossover PCB, and another ribbon cable connecting all of the left-side
connectors on the memory cards and controller (the right-side connectors
are N/C). Of the 3 optional Control Store modules in the
back, the middle one is
mounted under the CPU, but the other two are not there.
Looking from the back of the machine, the left-hand control store PCB
should always be present; it contains the base set ROMs and is connected
with a ribbon cable to the left-hand CPU board connector. If you have a
MEM card, then there should be a second control store PCB containing the
DMS instructions. The second and third boards plug into the first and
second boards respectively; no ribbon cables are used.
If the middle one is present and the left one is not, then either the base
set board is in the wrong location or it's been removed from the machine.
Part numbers on the board and/or ROMs will tell. 
The back label says "2112A" and lists
the following options:
12978A (Writeable Control Store Diagnostic)
12992B (Disk boot ROM)
12992C (Terminal boot ROM)
I figured out from the bitsavers document and another online document that
these are the 3 ROM options I saw.
I've never heard of a 12978A ROM. Is that the part number stamped on the
chip? What document describes this? 
The paper tape loader ROM is soldered in with the
M-series machines,
according to the online documents I read.
That's correct. It's always loader number 0. 
