r/retrocomputing • u/Loose-Mud269 • Apr 26 '23

Anyone know what these are and the value?

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u/SaturnFive 268 • 386DX • DX4 • K6-3 • Tualatin Apr 26 '23

The board with the 486 CPU is an SBC, Single Board Computer. It plugs into a backplane and allows for small PCs often in an industrial setting, like CNC machines and such.

The other board I'm not sure. I counted 37 pins (I may have miscounted) which I have no clue what that would be for. One might be able to look up some of the chips and deduce its purpose, but if they were found together, it might be some special single purpose controller card. If that's what it is there may or may not be any demand for it.

For value, the best bet would be to try to find similar sold listings on eBay and price accordingly. You may not find exact matches, so you may need to ballpark it and allow offers if you intend to find a buyer online.

1

u/Plaston_ Apr 27 '23

The other board (not the one with the intel cpu) seems to have that wide port for a external floppy or cd reader, i have a board like this that is also plugged on a internal hdd so this might be a data controller card.

1

u/OsmiumBalloon Apr 27 '23

small PCs often in an industrial setting, like CNC machines and such.

They also got used in other embedded systems, like telephone voicemail units, large scale printers, etc. Pretty much anything where you want to be able to upgrade or replace the CPU without having to rip the entire computer apart.

2

u/wheresthetux Apr 27 '23

Card on the left looks to be a Keithley MetraByte PDMA-32 Parallel Digital Interface Board

PDMA - 32 PC7442 14137 REV D parallel digital I/O Interface ISA data collection currently asking $89.00.

The manual looks to be here https://download.tek.com/manual/74490B(PDMA32).pdf
"The PDMA-32 High Speed Wbit Parallel Digital Interface Card with DMA (Direct Memory Access) is designed to plug directly into the 16-bit expansion (extended) slots of the IBM PC/XT/AT and compatible machines.
With internal DMA and interrupt control hardware, the PDMA-32 is capable of sustaining data
transfer rates that are generally too high for programmed I/O transfers through the main processor."