Fwd: Re: Revive 11/34

Van: John Welch via cctech Verzonden: vrijdag 8 december 2017 21:25 Aan: cctech at classiccmp.org Onderwerp: Revive 11/34 I am reviving an 11/34. Cards are: Back/Fans [M8266--------]? Front of machine where keypad is. ??????????? [M8265--------] ??????????? [M9312] [M7859] ??????????? [M7762--------] ??????????? [OPEN]? [M7860] ??????????? [M7840--------] ??????????? Bus grant in third from front slot ??????????? [M9302] [M7856] The 7856 is hooked to a cable/null modem (i think)/PC running XP&Hyperterminal When I first powered on the programmers console said '7' and I powered off, then back on, and now it says '5' Any suggestions as to what to try first?? I may have the bus grant in backwards.? I have other boards I can try. Sincerely, John Welch :qw It is not completely clear (to me) how the modules are installed in the backplane. Standing in front of the 11/34 processor box (looking at the console), slot number 1 is at the right side. Each slot has 6 positions. Position A is at the rear side, followed by B thru F. Position F is thus at the front side. There is no confusion about the first 4 slots. Slot 1 and 2 hold the 11/34A processor boards, with M8266 in slot 1, and M8265 in slot 2. Slot 3, positions A and B has the M9312 bootstrap/terminator board, and slot3, positions C thru F has the M7859 KY11-LB programmer's console interface board. Slot 4 holds the RL11 interface. This module does "DMA", so the NPR jumper must be cut (open) on the backplane. Slot 5 has an SPC in positions C thru F. I had to look it up; it is the DR11-C. We are up to slot 6. Now things get "interesting" ... is that M7840 a

The field guide says that this is a KE11-B Extended Arithmetic Element. I do not know that board, is it "hex" or "quad"? Not sure that board belongs there ... and if it is quad, I assume it has to be in positions C thru F. I would suggest to pull this module, and check the NPR wire presence on the backplane. You need a G727A or G7273 in this slot when the M7840 is removed. If you are not skipping slots (see below), we are now at slot 7. There is probably a G727A grant continuity card (aka "knockle buster") in position D. That would be OK, but if the NPR jumper is cut on the backplane, you would need a G7273 continuity and NPR card in positions C - D. It is easy to have the G727 put in wrong. The 4 copper "jumper" traces should be facing the next higher-numbered slot. Then you say that the next slot has the M9202 (in position A - B) and the M7856 (SLU and RTC) in positions C thru F. The M9202 connects two system units (backplanes). So, what is the next backplane?? Or do you have the M9202 in slot 8 and slot 9, positions A - B?? I have never seen that ... I am missing one slot. The 11/34 backplane has 9 slots. When you power up the system, the display should show 6 octal numbers. If only one digit shows a number (7 or 5 or whatever), there is an issue with the console itself, or the M7859. The 6 digits of the display are multiplexed. Maybe the connection cable between the console and the M7859 - damaged/knicked? It is worth checking out the simpler things

Henk.