To provide an update on the repairs so far, I've been able to save a few boards while others are waiting for parts.
I was able to save a display card (I have two bad ones and one is waiting for parts) and an APL ROS card which is really great. All by replacing some bad TTL logic chips. I still have more work to do. I also have two bad keyboards. It is the actual keyboard assembly as a known working keyboard works fine. I have taken them apart and cleaned them as best I could but that didn't help. One has exactly one key that works (a slash key on the number pad) but no other keys register. The second keyboard doesn't register anything. I am measuring this from the keyboard connector on the keyboard mechanism. One of the 5110's I acquired had a full set of manuals but they were water damaged and the schematics manual was one solid block of paper with all pages stuck together, unfortunately. I could really use some schematics. Does anyone have any schematics for the 5100/5110 they can share? There are some schematics in the 5100 Maintenance Information Manual on Bitsavers but they are more logical diagrams than actual schematics. What I don't know is if my "block of schematics" was like this as well. Any assistance would be much appreciated. Santo On Sat, Jun 12, 2021 at 12:25 PM Chuck Guzis via cctalk < cctalk@classiccmp.org> wrote: > On 6/12/21 1:58 AM, Christian Corti via cctalk wrote: > > On Sat, 12 Jun 2021, Tony Duell wrote: > >> I wonder if in the original list, a '1' was misread as a '7' or vice > >> versa. I am told that in some countries the '7' is conventionally > >> written with a crossbar across the downstroke to avoid this. My father > >> always did this, for all it is not common in England. > > > > In Germany, we *always* write a bar across the 7. I don't like uncrossed > > sevens because they are ugly ;-) and hard to distinguish from a 1. > > I do stroke my sevens just for clarity. However, here in the US, few > people write their ones with a serif--just a single vertical stroke. > That, in my experience is not common practice in many European countries. > > Writing zero with a slash, by the same token, probably leaves the > Scandanavian readers puzzled--as "oh" stroked is a letter of the > alphabet. Regardless, I stroked mine--a more universal practice might > have been to write zero with a horizontal or vertical stroke. > > I recall turning in keypunch forms to be punched and receiving my job > back with a note saying "I didn't know if you meant zero or oh, so a did > some of both". Wastebasket meet card deck. > > After that, I pretty much did all my own keypunching; management didn't > like that, but I persisted. > > --Chuck > >