Schematic for older PDP-11/05 CPU - M7261C?

[MattisLind]

I have a couple of older M7261, Etch C Rev F boards. Chips have dates codes in the late 71 - early 72 range so it is a quite early 11/05. The machine is completely dead with this board installed. The problem is that these boards differs quite a lot from later etches so the existing schematic are useless. The ones one bitsavers.org and the physical ones I have are all later revs.

Does anyone have schematic for the older C etch?

 

[1944GPW]

Mattis,
I picked up a print set for the 11/05 from my 11/15 recovery road trip that is earlier than the Bitsavers one. From a casual glance it appears to cover this M7261.
Here are a couple of quick snaps:


I will be scanning the 11/15 print set, fixed-head disk controller and other things in the very near future so let me know if this 11/05 print set is worth scanning as well, or if you want a few more quick photos.

I have an early PDP-11/05 s/n 151 chassis with the solid Mazak grille and a home-made console switch register board but the M7261 in it is a later rev F. I since acquired seperately the early console with the
non-screenprinted plain white digital moniker at the top left of the console casting.

 

[MattisLind]

Yes. It looks this is the printset I need! I would like a scan if possible. But a high res photo could be OK as well.

 

[1944GPW]

OK I'll scan it. I don't have a large scanner myself, so I go to an office supplies shop. Their scanners only do jpeg (this scan of the ME11-L I did is an example of how it turned out).

 

[thephysicist]

If you put the JPEGs on a google drive for download I volunteer to make a PDF from them

 

[1944GPW]

I have just uploaded the early PDP-11/05 print set that covers this board, you can find it at
https://archive.org/details/pdp-11-05-engineering-drawings-oct-1973

 

[MattisLind]

Thanks a lot Steve!