Tuesday, April 1, 2025

Feeling a bit more confident in the IBM 1130 core memory

CE STORAGE DISPLAY FUNCTION OF THE MACHINE

The machine has a few switches intended to be used by the Customer Engineer who services the system. One of them is Storage Display. When turned on, pressing Prog Start has the machine loop continuously through memory reading each word. If there were a parity error it would stop the scan, otherwise it just runs forever until you press Imm Stop to turn off the run flag. 

SHOOK MACHINE AND THUMPED CORE MEMORY COMPARTMENT WHILE SCANNING

While running the Storage Display, I jerked the machine around on its casters and even thumped atop the gate and compartment holding the core memory. No parity errors were detected which comforts me. I had feared there were intermittent connections, similar to the few I have already resolved, that would show up as new parity issues. 

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