Scientific Data Systems 420
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Scientific Data Systems 420 |
by Bill Degnan - 10/22/2020 15:51 |
 The SDS 420 computer is a 6502 CPU computer with Persci model 277 dual 8" disk drives and proprietary operating system. Click image for larger view.
More pictures I received the computer in pieces. The CPU board and RAM expansion board have a 1977 date on them but the actual machine was produced or last upgraded in 1979 (?). I worked with one of the engineers who built the computer, Bill Scheding, to re-assemble it. The Persci drives require repairs but overall everything looks good and should be fully restorable. I have a lot of notes and will post asap. Next - Rehab the drives and boot up the system. Document the memory map and archive the software. Reply |
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Not Good |
by Bill Degnan - 04/19/2023 21:50 |
 SDS 420 front
Too many points of possible failure and no reference/schematic to reference. More pics Reply |
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