Yeah, the fact that the issue is intermittent (mostly not booting) is weird.
Just to be clear, You mentioned a 25 pin connector. My understanding is that the console port is the printer port which is a 9 pin connector. Thanks for the info. I have ordered the stuff to make a cable so should be able to test console port this weekend. Kurt On Mon, Feb 26, 2018 at 9:23 AM, Paul Koning <paulkon...@comcast.net> wrote: > > > > On Feb 25, 2018, at 5:39 PM, Kurt Hamm via cctalk <cctalk@classiccmp.org> > wrote: > > > > Thanks for the suggestions. Interestingly, upon first boot I was able to > > get the hard disk controller error with the picture of the computer. > Then, > > sure subsequent reboots failed to display anything. > > > > I removed all the cards and booted with no luck. > > That would be the expected result if the status lights indicate a > motherboard failure -- it means you're not reaching the point where it > looks at the I/O cards. > > > It looks like I will need to build a cable to try terminal mode. I did > > hook a vt220 with a 9to25 cablw, but didn't get anything. > > You need a cable specifically wired as console cable. Check the technical > manual for the details. The DB25 connector is used to connect either a > (serial) printer or a console, and the two are distinguished by a jumper > between two of the pins. So a console cable has that jumper in its > connector, a printer cable does not. If you don't have the jumper, the > speed will be set differently (4800 rather than 9600) and the UART will not > appear at the console UART address. > > paul > >
