Sunday, July 12, 2026

This and that - waiting while moving several projects along

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WAITING FOR FILTER FOAM AND MATERIAL TO REPLACE HEPA FILTER ON DIABLO The Diablo archiver project depends upon the Diablo model 31 disk driv...

Returning to testing for the Virtual 2315 Cartridge Facility

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1130 SYSTEM NOW SOLID - POWER AND MEMORY ISSUES RESOLVED When I was last testing the cartridge facility, I began to encounter parity stops d...
Saturday, July 11, 2026

Debugging work on the multiply-divide issue with the 1130 MRAM board - memory fixed and working flawlessly!!!!!

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FALSE BIT 13 WHEN READING CERTAIN ADDRESSES WITH UNKNOWN CONDITIONS The CPU diagnostic runs a test of the multiply and divide hardware which...
Friday, July 10, 2026

Unexpected results when digging into the Multiply-Divide error in the CPU diagnostic program

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WORK ON MULTIPLY-DIVIDE DETERMINISTIC ERROR IBM's CPU diagnostic program exercises all the instructions of the machine, trying all the v...
Wednesday, July 8, 2026

Updated memory substitute board, chasing down two failures

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NOW THAT THE MAIN ISSUE WAS IDENTIFIED, THE FIX WAS APPLIED Amazon had a vendor offering 0805 size surface mount resistors in a set that inc...
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Monday, July 6, 2026

Building the Diablo 2315 Archiver circuit board

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CIRCUIT BOARD ARRIVED - THANK YOU PCBWAY.COM PCBWay.com offered to sponsor the production of the main printed circuit board for my project t...
Sunday, July 5, 2026

Better chat with Copilot led me to an important issue with the 1130 MRAM board - and it appears to be the root cause of my issues!

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USING COPILOT TO REPEAT CONVERSATION WITH GOOGLE AI I repeated my discussion from earlier, describing the observed signals and the sporadic ...
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