Recent content by mwillegal

I've put up on my website a new MCMON (a tiny 256 byte monitor for the 8008) that supports SCELBI keyboard interface input and Digital Group Video card out. I also have a port of SCELBI hangman with the same drivers embedded with it. Links to webpages with downloads follow...

Since I'm no longer making or selling Brain Boards, I've made the Gerber files and CAD files available for download from my website. This board has been cloned by a few different folks, but if you want to make one, it's easier than ever. http://www.willegal.net/appleii/brainboard.htm I'm...

Three 8008 items are now available and downloadable from my website. My OS/X SCELBI app has been updated with a Scopewriter interface. The latest version is free: http://www.willegal.net/scelbi/scelbiapp.html A new version of the 256 byte 8008 monitor - MCMON - that runs with SCELBI keyboard...

Couple of questions related to this video card that was initially designed for the Mark-8, but also used with other systems, such as the SCELBI. I'm interested in having one to go with my growing array of SCELBI peripheral devices. 1) Does anyone have or know of one that may be for sale? 2)...

This is something that was done back in the day and I felt that I had to recreate this combination of devices. I also have a little 256 byte monitor hacked together. The monitor supports reading and writing memory and executing programs through normal keyboard input. These add ons turn the...

The following link will lead you to a video showing off many of the components of a SCELBI 8B with audio tape, keyboard and oscilloscope interface. It starts with a description of each individual module. Then the components are all “hooked up”. The systems is powered up and some of the...

sorry in advance for cross posting so much I've been busy getting ready for the upcoming VCF east event and I'm really excited about what I'll be able to show this year. I'll show a working SCELBI 8B connected to a oscilloscope and keyboard which are used as a terminal. A cassette tape...

Sorry about cross posting all over the place, but I'm pretty excited about this version of my 8008 emulator. It's capabilities have finally caught up with the capabilities of a real SCELBI 8B. some notes on my blog http://www.willegal.net/blog/?p=7703 and a link to my 8008/SCELBI emulator...

Since I have my SCELBI cassette interface working, I was able to take a trial run of the SCELBI integrated development environment otherwise known as MEA. This environment has a editor, assembler and debugger that is pretty smoothly integrated. I would say the editor is pretty clunky, even...

Before I do too much digging, I figured I'd throw this question out there. Consider the following code fragment in the SCELBI tape driver. Register B is set to zero before this function is called. 38 77-052 044 017 NDI 017 39 77-054 201 ADB 40...

Here is a link, http://www.willegal.net/scelbi/8008-disassembler.c, to the “C” language source for my 8008 debugger/disassembler. Though it has been a while since the code diverged, the core 8008 instruction emulator is essentially the same as used in my Macintosh OS/X app. Some of the output...

I just finished adding two new web pages to the 8008/SCELBI area of my website. Take a look, if you want to see what can be done with 256 bytes in an 8008 and how to add a monitor and EPROM to your SCELBI-8H. http://www.willegal.net/scelbi/the8008andScelbi.html enjoy, Mike Willegal

Almost, because I need to construct the cassette tape interface to make MEA completely functional. I'm also working on a TTY emulation package for the Apple II for those who can't find a real TTY or equivalent. Note that I don't believe that there are any original SCELBI 8B's in fully working...

This has been a very long time coming. I don't believe that any surviving original SCELBI 8B's are capable of running SCELBAL, mostly due to SRAM issues. Heres a very poor quality video of it running. http://www.willegal.net/podcast10-11-14.mp4 Note that the versions of SCELBAL found on the...

Some people have been asking for these for a couple of years. I hope the wait will be worth it for those people. I have memory expansion, 4K sram and the backplane PCBs on order. Combine those with the CPU, front panel, input and DBB cards that I already had made for the SCELBI 8H project...