great news. hope for further success. On Sun, Aug 2, 2015 at 10:19 AM, Michael Thompson <michael.99.thomp...@gmail.com> wrote: > With a lot of help from Dave Gesswein and Warren Stearns we were able to > get the MARK12 PDP-12 tape formatting program off a LINCtape and int paper > tape format. Running it showed that a diode on the field-0 core stack had > failed during the week making memory in the range of 4000-5000 unusable. > Fortunately we had a spare core memory stack so we were running again in a > few minutes. We have traced and replaced diodes on core stacks before, so > we will fix the broken core stack. > > We were able to format a LINCtape, but running it without a video display > was a little challenging. The tape diags work better with the reformatted > LINCtapes, but still not perfectly. It looks like there is an issue in the > selection logic in the TU56. That should not be difficult to debug and fix. > > We booted LAPS6-DIAL from LINCtape. The VT14 display is not working yet, so > we were driving blind. We could see some fuzzy characters displayed on an > oscilloscope so we could see that our typing was actually getting handled > by the editor. We tried three different oscilloscopes, but none have an > intensity or blanking input so the display was not readable. > > We couldn't find any documentation for booting OS/12 from LINCtape, so > Warren looked through an octal dump and found that block zero is the boot > block, just like OS/8. The OS/12 boot block starts at 0020 like many LINC > programs. Since this uses the serial console we were able to interact with > the OS normally. > > This is the first time in 24 years that an OS has been run on this system. > > -- > Michael Thompson
-- Bill vintagecomputer.net
