Subject: Re: PDP-11/73 boot issues References: <87ilytoikj....@carbon.nat.rhwyd.co.uk> <CADBZjLYN9aUTDHJ6=xjwnnneftubzyzis4evrs1coy2r9xc...@mail.gmail.com> <87fstxohuj....@carbon.nat.rhwyd.co.uk> <edde8fc9-6e38-3215-970f-34b9f3a95...@alembic.crystel.com> <21789e85-2aa4-3b61-db31-b21fd8c08...@dunnington.plus.com> <87czp1obv4....@carbon.nat.rhwyd.co.uk> User-agent: mu4e 0.9.18; emacs 27.2 In-reply-to: <87czp1obv4....@carbon.nat.rhwyd.co.uk>
Aaron Jackson via cctalk writes: > Pete Turnbull via cctalk writes: > >> On 21/09/2021 20:34, Chris Zach via cctalk wrote: >>> Can an MXV11 be used in a 22 bit system? I thought it was an 18 bit >>> device? >> >> MXV11-B is 22-bit. MXV11-A is 18-bit but supposedly can be used in a >> 22-bit system if the RAM is disabled. > > Yeah this is a 22 bit card. Josh sent me an xxdp image which I could > easily boot from my scsi2sd (thanks!). Seems to be reporting an error > with the CPU unfortunately: > > ]] .R ZKDJ?? > ]] ZKDJB2.BIC > ]] > ]] ERROR WHILE TESTING BOARD FUNCTIONS > ]] ERROR # =001166 > ]] ERROR PC =040662 > ]] 043632 > > This happens regardless of whether W9 is installed or not (supposedly > disables the LTC register on the CPU?) > > I'll see if I can borrow another CPU card form a friend this > weekend. Unless anyone else has any ideas? Another suggestion on IRC > was to disable the PSU LTC and enable the LTC on MXV11 but will need to > look up some details on how to do this. Had a nice cycling trip this evening to pick up a spare 11/73 card. Unfortunately it did not fix my issues so I'll have to do some more digging. Has anyone disconnected the BEVENT line and used a signal generator to provide the LTC? Curious to try this to figure out if mine is just being noisy or something. Thanks, Aaron
