STEbus 68008

68008 processor board renovation

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Renovation of a tried and tested commercial design. Not my own design!

I have the manual, circuit diagram and working boards.
The PAL chips have been read, analysed and recreated.

I modified the board to accept larger RAM chips, and ported EH-BASIC onto it.

As the 68008 is the best fit for interfacing the STEbus, I have used it as the exemplar for future designs.

STEbus 68008 files. Manual, circuit, logic, pictures.

Zip Archive - 1.75 MB - 01/05/2018 at 01:45


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Plays with LEDs wrote 08/28/2019 at 19:49 point

Ideally both, I think STEbus allowed 3 different CPUs as bus masters.

A CMOS 65c02 or 65816 (can address 8M of RAM) would be a nice addition to the project, those are still in production and used by a lot of things.

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Keith wrote 08/28/2019 at 20:19 point

Ideally, I'd like to do all popular processors but I have very limited time. Even one will take a lot of scarce time, so I need to focus on one job at a time.
My hand-wired 65C02 prototype demonstrates bus I/O cycles, and is on hold until I can make a better platform (i.e. layout a PCB).
I'm currently focused on the 6809E, because I have a PCB for that.

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Plays with LEDs wrote 05/16/2019 at 21:40 point

Like seeing the STEbus experimented with again.

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Keith wrote 05/22/2019 at 19:21 point

Where you an STEbus user, and if so what did you use it for?

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Plays with LEDs wrote 05/23/2019 at 19:53 point

I was not, the research group next door used 2U VMEbus boards, I have three empty VMEbus backplanes, and an embarassingly large number of connectors. I'm interested in STEbus because it can support multiple CPUs.

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Keith wrote 05/23/2019 at 21:29 point

Do you mean multiple CPUs in a system, or multiple different types of CPU can drive the bus? Being CPU-neutral, it looks ideal for the hobbyist community. I want to make examples of every CPU to demonstrate this. So far I have the 68008, Z80, and 80188 running. Not sure what to tackle next. Z180, 6809, or 6502? I have the Z8002 and 32016 in my collection as well...

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