Tom said > 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 >
Yes my M7261 board drawing appears to be the earlier one, similar to the GT40 drawing but is revision N instead of M. (I myself have an early 11/05 s/n 151 but it has a later M7261 in it.) >From the ex-BHP print set the microcode listing details and Page Revision >Control Sheet latests are ---- K-MP-KD11-B-1 MICROPROGRAM FLOW Rev B (PRCS: Rev. B [BAAAAABAAAAAAAAAAAAAAA]) (Listing: K-MP-KD-11B-1 Rev. A 27-JUL-72) ---- K-MP-KD11-B-2 MICROPROGRAM SYMBOLIC LISTING Rev D (PRCS: Rev. D [DABCBA]) (Listing: K-MP-KD-11B-2 Rev. A 27-JUL-72) ---- K-MP-KD11-B-3 MICROPROGRAM BINARY LISTING Rev D (PRCS: Rev. D [DABBBBA]) (Listing: K-MP-KD-11B-3 Rev. A 27-JUL-72) ---- K-MP-KD11-B-4 MICROPROGRAM CROSS REF LISTING Rev D (PRCS: Rev. -) (Listing: K-MP-KD-11B-4 Rev. * 2-MAY-72) ---------------------------- M7620-0-1 DATA PATHS Rev. N (PRCS: Rev. N [NNNNMMMNMMMM]) M7260-0-8 DATA PATH ROM PATTERNS Rev. ? (same as GT40) ---------------------------- M7261-0-1 CONTROL LOGIC AND MICROPROGRAM Rev. P (PRCS: Rev. P [PNHHJKJHJMKKKH]) M7261-0-1 CONTROL LOGIC ROM PATTERNS Rev. A (same as GT40) (PRCS: Rev. A [AAAAAAAAAAAAAAAAA]) Steve.
