On 6/17/21 6:57 AM, Steve Malikoff via cctalk wrote: > Tom said >> I have a couple different drawing sets for the 11/05 and while some have the >> matching M7260 >> schematic, only the GT40 drawings (I found on bitsavers) has the M7261E >> schematic: >> >> http://www.bitsavers.org/pdf/dec/graphics/VT11/GT40_Graphic_Terminal_Engineering_Drawings_Feb73.pdf >> >> The GT40 drawings has the PROM listings and related, so I am hoping that >> they match what is in the >> two boards. > My original PDP-11/05 print set that came from the BHP steelworks is titled > just 'PDP-11/05 Engineering > Drawings' and the drawings are for machine revision 1105-0. It covers the > early 11/05 with the cast metal > grille with no slots (as seen in the 11/05 handbook) rather than the later > 11/05 with the plastic slotted > grille. > The dates on the drawings are 1972 and some of the microcode listing dates > are different to the 'PDP-11/05-S, > 11/10-S systems engineering drawings' bitsavers scan and the GT-40 scan, and > some of them are the same. > > I'm not sure where I look to see what revision of the M7261 it shows, as the > Rev box in the bottom right > seems to jump around, eg. Rev N, Rev K, Rev H or is that just the minor > drawing revision for that page? > > Steve > If you look at the board layout for the M7261, the E rev board has a large open area, devoid of ICs, whereas the non-E rev board has a uniform distribution of ICs across the surface.
--tom
