MM1-Updates

MM/1 Hardware & Software Updates and Notes.

07/22/2024

Update: Got my MM/1 CPU Board to boot using the NEW ATX Board.

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, David Ladd, Joel Ewy & David Graham. The latter two helped with the troubleshooting back in the 90's for Paul & Kevin.

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. DONE!!

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

1. If you have a newer PS/2 Keyboard, get this adapter that works with the MM/1:

   https://www.ebay.com/itm/304764787978

2. Check these Memory Modules out that work with the MM/1:

   https://www.youtube.com/watch?v=De5ufcDueRU&t=3920s

   or buy them here:

   https://ko-fi.com/s/c3f82f22b9

3. 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.

I have uploaded the CPU Board Schematics that I have been recreating using KiCAD.

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 - 70% done
• Test
• Load the I/O board schematics into KiCAD and fix the errors
• Get more ideas