Miscellaneous System Number 1

I obtained this system in 2012. It cost nothing. That was well worth it!

It contained no boards, but did contain the Altair A/B front panel support punched for either actual front panel. It came with a B front panel - turn key. It also contained an Altair BT motherboard with 18 perfect S-100 connectors. There were 6 broken card slots/supports out of 36. I plan to space out boards will just move around the supports to meet my needs. I like a lot of space between boards for air circulation.

The chassis is missing the cover and back panel. The power supply is also missing. That is the next project - back panel and power supply.

Here are some pictures of the system:

Altair BT Chassis Altair BT Chassis

I have an operational Compupro 85/88 system. I will use this system to test the boards that are going into this system. The boards I plan to use are:
1) SSM Z80 CPU
2) Compupro RAM 16
3) SDSystems SIO-8 Serial Board
4) SDSystems VF II FDC
5) Homebrew Front Panel

This will be a very basic system as they were in the late 70's

Bill

2211 MST 15 May 2014

Found some open frame switching power supplies from WattSupply which will power the board set I plan to use in this machine. Prices are good and size looks good, as well.

Bill

1214 MST 16 May 2014

I have found the proper switching power supplies to replace the missing linear power supply on the Altair chassis. It will require 4 power supplies:
1) PD-65A 12V/2.8A and 5V/5.5A dual supply - for floppy drives
2) PS-65 7.5V/8A supply - for mother board +8V
3) PS-15 15V/1A supply - for mother board +16V
4) PS-05 15V/0.35A supply - for mother board -16V
I will order these supplies this weekend.

I am in the process of finding ways to get front panels and back plates manufactured to my specifications. I would rather pay to have the metal work done than to drill and nibble away at it!

Bill

1446 MST 17 May 2014

I have ordered the four power supplies from WattSupply.

I am negotiating with a metal supplier in Prescott, AZ. to make my front and back panels including all the drilling/punching. I have to creat a dimensional drawimg of each panel for them to do a quote. I am hoping this will be a reasonable cost. I don't want to have to work the panels and can't afford the $500 a piece cost of the Greenlee punches I would need!

Bill

1353 MST 20 May 2014

The power supplies are back ordered and should arrive in 4 to 6 weeks. That puts a delay on this project! Meanwhile, I continue to think about and design the front panel hardware and it's layout.

Bill

1311 MST 2 June 2014