I amaged to snag a Burroughs TD016 with Honeywell SD switches from ebay a few weeks back for a bargain price however the board had not been stored in the best of conditions
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After removal of keycaps
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Bottom Plate
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I decided that I would restore the keyboard as best a possible and that I would also attempt to convert it to USB. I desoldered the switches so that i could restore the plate and also map the PCB.
PCB Front
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PCB Back
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Restored Plate
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Restored Backplate
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Cleaned Caps
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Internal restoration complete, As you can see I have rearranged the layout slightly for a more modern look.
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As you can see I have not soldered the original PCB back onto the switches. I did a lot of research looking through teh various ways that the SD switches can be made to work on USB and have settled on strobing the power lines and reading the output pins following this detailed and infomative topic for those interested
viewtopic.php?f=7&t=18163. For this i will need to handwire the matrix as modifying the original PCB was not possible. This is where i will need the help of Dt members that would be willing to sell me 8 type A sensors. The top 5 switches with blue keycaps have Type B pulse sensors so may not be detectedusing the strobe and dense method. 2 of the switches have Type C sensors which may work however would prefer replcing them with type A and one of the switches i accedently put the hall sensor in the wrong way round and removed the sensor from the board when i pushed down on the switch. If anyone is willing to sell me the sensors i need I would be extremely grateful as I always attempt to convert any keyboard to USB where possible so i would hate for this keyboard to be nothing but a paperweight after spending teh time restoring it.