Monday, September 14, 2026

Final wiring of Virtual 2315 Cartridge Facility into the VCF - Infoage Museum IBM 1130

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POWER FAIL PROTECTION FOR V2315CF INSTALLED At the heart of the Virtual 2315 Cartridge Facility (V2315CF) is RAM that holds the entire conte...
Sunday, September 13, 2026

Deglitching the write output of the 1130 for Virtual 2315 Cartridge Facility - part 1

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EVALUATING STRATEGY FOR DETERMINING BIT VALUE The IBM 1130 writes to disk alternating values on the -Write Clock and Data  signal line, with...
Wednesday, September 9, 2026

Debugging 1130 disk controller logic concerning -write gate malfunction part 2

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WHAT I OBSERVED MONITORING THE SIGNALS INVOLVED IN -WRITE GATE In my last post I discussed the circuits that generate the -Write Gate  signa...
Tuesday, September 8, 2026

Debugging 1130 disk controller logic concerning -write gate malfunction

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WRITE STEADILY COMMANDED AS VIRTUAL 2315 CARTRIDGE FACILITY BECOMES READY After I enabled my logic to begin testing the write functionality,...
Sunday, September 6, 2026

Testing my new seek logic for the Virtual 2315 Cartridge Facility - part 17

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RESEATED CARDS AND CABLE CONNECTORS IN 1130, RESUMING TESTING I pulled out some of the SLT cards to gain access to gate A compartment C1 of ...

Completed my EDUC-8 computer based on Electronics Australia articles starting August 1974

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ONE OF THE VERY FIRST HOME COMPUTER DESIGNS The most well known of the early home computer designs is the Altair 8800, a kit from MITS that ...
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Friday, September 4, 2026

Further research into the issue logging commands in one of the Virtual 2315 Cartridge Facility boxes

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HAD NARROWED THE PROBLEM DOWN IN PRIOR SESSION In the last session, I determined that the problem in the main box of the Virtual 2315 Cartri...