> On Jun 28, 2022, at 1:29 PM, Douglas Taylor via cctalk > <[email protected]> wrote: > > On 6/28/2022 12:58 PM, Douglas Taylor via cctalk wrote: >> I have a couple of these boards but have never got into the on-board monitor >> which requires an adapter board that allows a terminal to talk to the >> controller board and do various things. >> >> Looking at the manual on bitsavers there is almost enough info to construct >> my own adapter board. Has anyone ever built there own adapter to the >> controller? >> >> Doug >> > I wasn't clear about this. The Viking board I have is a dual width q-bus > board that connects SCSI disk or tape devices VAXes or PDP11s using MSCP > protocol. In the bitsavers manual on figure 8 is a drawing of the 'Serial > Port Cable Adapter'. Table 2 lists the pin-out of the 50 pin IDC connector > and which lines are used for what signal. In that list are these RS232 > connections: > > IDC pin 20 -> CON TX (RS232) > > IDC pin 22 -> CON Rx (RS232) > > IDC pin 28 -> FP TX (RS232) > > IDC pin 30 -> FP TX (RS232) > > I was able to trace these IDC connections back to an ICL232 chip on the > Viking board which is an RS232 driver chip. > > My question is which of these RS232 lines are brought out to the 'Serial Port > Cable Adapter'? Which ground do I use? What do CON and FP stand for? > > I am trying to de-bug one of the boards and would like to get into the > on-board monitor and see what it tells me about the board configuration.
For the UDT at least the RS232 lines are regular RS232 and the plug I made for communicating with it was just an old PC serial pigtail bodged onto a short SCSI ribbon cable. I would expect CON to be CONfiguration port; No idea what FP is for.
