On Thu, Mar 17, 2016 at 7:45 AM, Mattis Lind <mattisl...@gmail.com> wrote:
> I was thinking of using a M9301 board to get a console emulator and some > different bootstraps with the 11/05. But can I just put the M9301 in the > slot where the M930 normally goes? Slot 4 AB. > > From looking in the schematics I get that: > > 1. The bus grant pull ups on the M9301 is through jumpers. According to the > note they should only be installed on 11/70 systems. But the M930 do pull > these up (no jumpers here) so my guess is that these jumpers should be > installed. > > 2. The M930 connects much more signals to a common ground. Except for the > normal ones the M9301 uses for ground (AC2, BC2, AT1 and BT1) it also has > connected AB2, BB2, AN1, AP1, AR1, AS1, AV2, BD1, BE1, BV2 to ground. > > Reading the pin assignments on a MUD slot I think that putting a M930 into > it could potentially create a lot of smoke. BV2 is -5V and AV2 is +20V if > the appropriate regulator is in the system. > > M9301 goes into MUD slots. But can it go into the slot where a M930 > normally sits? > > My thinking is that it should work. What is your experience? > > /Mattis > I am not 1/2 as knowledgeable as others here, but what comes to mind is "backplane change", I think you'd leave the M930 where it is and on the 2nd backplane segment install the M9301. If you don't have a 2nd plane I'd say you may not be able to use this. Just my GUESS, but I am interested to learn the correct answer. b -- @ BillDeg: Web: vintagecomputer.net Twitter: @billdeg <https://twitter.com/billdeg> Youtube: @billdeg <https://www.youtube.com/user/billdeg> Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>
