Saturday, April 25, 2026

Don't waste your time, spammers. Comments are moderated and spam deleted

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BIG UPTICK IN ATTEMPTED SPAM I have had a spate of posts by different people attempting to market items on my blog, posting a comment that i...
Tuesday, April 21, 2026

Revision PCB being built for the 1627 Plotter substitute controller card

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NEED A REVISION DUE TO CONTACT SOLDERING ISSUES Having switched over to removing IBM Solid Logic Technology (SLT) card contacts from donor c...
3 comments:
Friday, April 17, 2026

Back to the need to load the 1130 SBR card pins the same as my oscilloscope probe

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THE WATCHED POT NEVER BOILS - OR IN THIS CASE THE BIT NEVER FAILS I set up the scope again to watch the exact analog signal occurring when b...
2 comments:

Fighting with the SLT contacts to solder them onto my 1627 plotter controller card

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CONTACTS TURN AND TILT WHILE SOLDERING I attempted the method of soldering one side using 183 C solder paste and hot air, so that I could ad...
1 comment:
Wednesday, April 15, 2026

Showing redundant wirewrap connection for Sense Bit 14 entering the SBR card

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WHY THIS REDUNDANT CONNECTION? The wire around pin D10 of slot L3 is the one that carries the -Sense Bit 14 pulse from memory into the card ...

Adding functionality to 1627 Plotter controller card project

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REQUEST TO RECEIVE PLOTTER COMMANDS OVER USB SERIAL LINK A great suggestion came from a museum that will build one of my 5806223 substitute ...
1 comment:
Tuesday, April 14, 2026

Working on the connectors for the substitute 1627 plotter controller card

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NEW APPROACH - BORROW CONNECTORS FROM A SACRIFICIAL IBM SLT CARD I came to the realization that if I could take the specially shaped connect...