SCELBI Running at 800kHz!
The Intel 8008 processor has two speed grades, 500 kHz and 800 kHz. The 800 kHz version is labeled as the 8008-1. Peter Miller is building a SCELBI 8B and decided to try to run his newly built system at … Continue reading
The Intel 8008 processor has two speed grades, 500 kHz and 800 kHz. The 800 kHz version is labeled as the 8008-1. Peter Miller is building a SCELBI 8B and decided to try to run his newly built system at … Continue reading
Peter Miller is in process of building a reproduction SCELBI 8B and came up with good solutions for the chassis and front panel. Be aware that the following files are ONLY for the SCELBI 8B. The SCELBI 8H had slightly … Continue reading
Back in 2017, I started on a hardware manual for the SCELBI computers. This originally was a digital copy of the original SCELBI 8B hardware assembly manual, which described construction and basic operation of the SCELBI 8B CPU. The original … Continue reading
Booting the SCELBI without an integrated EPROM boot loader/monitor can be an extremely difficult and time consuming process. The first issue of the SCELBI newsletter described a very simple peripheral that makes this process easier. I’ve known about this simple … Continue reading
I had a bit of trouble debugging the 5 volt side of this power supply. First symptoms I noticed was an inability to regulate under load. As the load increased the output voltage dropped significantly to the point where the … Continue reading
Here is the front of the factory power supply that is part of the SCELBI-8B system described in the last post. A simple on-off switch, three banana plugs/binding posts, (+5 volts/-9 volts/ground) and an Amphehol 4 pin socket for connecting … Continue reading
What we have here is a complete, original operating SCELBI-8B. It includes 12K SRAM, 4K EPROM loaded with MEA, a TTY interface, a cassette interface and on the right, an extremely rare SCELBI factory power supply. I was asked by … Continue reading
I managed to test the version of MCMON for Digital Group Video card on real hardware, but there was a bit of drama involved. I started seeing corrupted characters when running Hangman with this card. From the beginning it looked … Continue reading
This is version 3.1 of the OS/X SCELBI app and can be downloaded from the usual page. There is only one change in this version. It turns out that when 0xFF is written to it, the actual Digital Group Video … Continue reading
This version adds support for the Digital Group Video Board, as well as a ported MCMON monitor for the 8H that works with that interface. The following image is a screen shot of the app, showing the DG Video screen … Continue reading