I've just been talking with this visitor to @tnmoc who used to work for BRUSH Electrical in Loughborough. He used to program their Elliott 803, which is shown in the picture on the wall. We had a long chat about the HCODE language developed at BRUSH and still used on our 803.

@bittenapple @tnmoc 90 was a typical figure for the number of hours use in a week. It's not an "up to" limit.

@theRSGB Are you aware that Bletchley Park is closed today (due to the wind 🙄 ) so NRC will be closed. @TNMOC is still open though.

If you were planning a visit to Bletchley Park today, they have decided this morning not to open due to the wind. However The National Museum of Computing @TNMOC is still open so why not come and learn about the Bombe, Colossus and post war computing from us instead.

@DissBugBear @tnmoc The issue is actually with the valve bases, where the HT voltage is causing a deposit to form on their surface.

An excessive level of detail strikes again !

@recantha @DougGore Esp. portrait mode display with asymmetric viewing angles if mounted in loandscape mode. Even my 10 year old tablet doesn't suffer from that !

@SteveTrewick @RueNahcMohr @tnmoc It's not 1960's technology for sure :-) The 803 is a serial machine so there are no "busses" as such. You only one connection to see all 39 bits in a word, one bit/6μS. 4 signals are monitored, a timing pulse, the address,and values going into and out of the core store register

@recantha Well yes there is a difference in technologies, but their dumbing down has resulted in nonsense ! It's like saying "one uses cars, which causes trouble because they run out of fuel, and the other uses diesel cars which can be fixed by filing them with diesel."

@recantha How do you think "mobile technology" works ? a) magic b) smoke and mirrors c) radio signals. 😉

Today we did a bit of appropriate Algol-60 programming on the Elliott 803 @TNMOC

@VirtualColossus You've prompted me to look at the GPU load while running my emulator. Graphs start looking at blank area, then the console, printer,plotter. I've also changed the code to use a "frame complete" callback and now it's doing ~30 frames/second.

@VirtualColossus It's hard as the frame rate is only 20 fps. which was all the 3D hardware could manage when I started on the 3D version many years ago. Printer rate is 10 cps so only two frames per character ! I could prob. up the frame rate on modern h/w but still running on a Pi is important.

@gm8arv And you just know that there's no point in writing to them to point it out 😆

@PaterPracticus @adafruit @Raspberry_Pi Look at Section 4.5 .