Monday, November 1, 2021

Debugging continues for new Documation card reader controller

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 INVESTIGATING THE MISSING ROW 9 DATA To divide up the set of suspected failures I tacked a wire onto the output of the gates driving the D9...
Saturday, October 30, 2021

P390 is working! Two small issues to chase down with the new Documation interface

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 DOCUMATION INTERFACE DEBUGGING RESULTS I first made the changes from last post - switching to direct port access for the LED and PICK signa...
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Debugging new Documation card reader controller, also debugging P390 system

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 P390 STATUS I was able to start up an instance of OS/2 on the server, although not the version that had the P390 software installed. Still,...
Thursday, October 28, 2021

Finally getting back to the shop

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 BEEN AWAY DEALING WITH NEW HOME I have finally completed the majority of the tasks and shopping for my new home, allowing me to return to t...
Tuesday, September 28, 2021

Validated and corrected interface polarities,

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 RESULT OF VALIDATION OF INTERFACE POLARITIES After I powered up and checked all the polarities, it was clear that all the status signals in...
Monday, September 27, 2021

Rearranged shop, building new card reader interface

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 REARRANGING WORKSHOP I bought additional folding tables in order to lay out and organize items in my shop - three 6 foot and two 5 foot tab...
Thursday, September 23, 2021

Hunting the elusive motherboard for x235 server

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 MOTHERBOARD PART NUMBER FOR MY VERSION IS 23K4588 I see other part numbers on eBay but the two that are the same are both in Europe, come w...