MM/1 Hardware & Software Updates and Notes.
01/24/2024
Update: Got my MM/1 to boot using a ATX PS. Partly.
First of All, A big Thank You goes out to Paul Ward, from IMS, Inc. and Kevin Pease for Designing the MM/1 System in the early 90's.
Also a BIG THANKS goes out to the following people's help: Pedro Pena, Joel Ewy & David Graham. The latter two helped with the troubleshooting back in the 90's for Paul & Kevin.
I hope to soon get my MM/1 up and running with a new ATX power supply.
I did make an adapter for use with the MM/1 and the Tandy CM-8 Monitor.
https://github.com/HomerKH19/MM1-Updates/blob/main/DB9toMM1.jpg
First is to start with an upgrade to the Minibus.
I have a working prototype that supports the newer ATX Power Supply.
Here is the picture of Pedro's build:
https://github.com/HomerKH19/MM1-Updates/blob/main/Org%20ATX%20Version.jpg
Here is a picture of my build:
https://github.com/HomerKH19/MM1-Updates/blob/main/My%20ATX-X2%20Final.png
Check these Memory Modules out:
https://www.youtube.com/watch?v=De5ufcDueRU&t=3920s
or buy them here:
https://ko-fi.com/s/c3f82f22b9
Joe's Computer Museum has the Blue SCSI Ver 2 Desktop SD Card Drive here, that works with the MM/1:
https://jcm-1.com/product/bluescsi-v2-50-pin-desktop/
Here is Page 5-13 of the MM/1 Tech Manual that has been updated:
https://github.com/HomerKH19/MM1-Updates/blob/main/MM1%20Bus%20Pinout.pdf
A PDF of the BOM's are available to download also.
- Make replacement backplane that accepts an ATX style PSU V 1.5
- Assemble and test
- Get Feedback
- Reverse Engineer the V2 Minibus board (8 Meg)
- Work on upgrades to V 3.0 of the Minibus
- Add 2 more Buss Connectors to the board for NEW hardware
- Build V3 Replacement Board - 50% done
- Test
- Get more ideas