Rescue 1130: 2014 Pickup of an IBM 1130 System and More
Wednesday, May 1, 2024
Ordered components for DMA based core loader; arrived home today
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COMPONENT ORDER PLACED I sent the final order for the ICs, voltage regulators and terminal block to Digikey, so that I should have both PCBs...
Sunday, April 28, 2024
Ordered PCBs for DMA version of core memory loader; shop almost completely prepped for move
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TOOK A SLIGHT GAMBLE AND SENT PCB OUT TO BE FABRICATED I have completed circuit simulations which appear to show that my state machine is so...
Friday, April 26, 2024
Rotate tape installed on SSM 1053, curve tracer images of two transistors
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ROTATE TAPE REPLACED ON SSM 1053 The broken tape was replaced with a pristine new tape. It took about twenty minutes of fiddling inserting t...
Thursday, April 25, 2024
Burned again with transistor substitution chart for IBM house numbered transistors
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SUBSTITUTE TRANSISTOR ARRIVED FOR IBM 086 Per the substitution chart, the replacement should be a 2N214 which I had purchased on eBay. When ...
Wednesday, April 24, 2024
Working on the disk drive, breadboarding new loader, repairing SSM 1053 and other tasks
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ADDITIONAL TREATMENT OF RUST ON MODE SWITCH PLATE AND DISK PARTS As I mentioned in a prior post, a few parts still had signs of orange-brown...
Disk cleaning, mode switch plate, and paddle card repair
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CONVERTED RUST PRIOR TO PAINTING MODE SWITCH COVER As you can see, it took multiple treatments to get down through the layers before it was...
Tuesday, April 23, 2024
Spent a few days working on a new memory loader for 1130 systems where Arduino uses DMA to core
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EXISTING CONSOLE LOADER IS JUST TOO SLOW The console loader device that I created and have installed on several 1130 systems simply automate...
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