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MM1-Updates

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.

Goals

  • 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

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