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Anyone care to take a guess ??

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First post, by Vipersan

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So ..digging around again in my loft ..
I found this ISA card ..
..and no I havent a clue what it is ..nor what it was used for ..
Suffice to say it looks proprietory ...complex ..and requiring something input to a rather unusual 50 pin D type connector.
..and only requires an 8 bit ISA slot ?
Anyone care to take a guess as to what it might be ?
rgds
VS

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Last edited by Vipersan on 2018-08-09, 21:17. Edited 1 time in total.

Reply 1 of 3, by cyclone3d

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According to the info in the socketed chips which are dual UART, it looks like it may be an 8-port serial card.

Good luck finding pinout information.

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Reply 2 of 3, by LeFlash

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Finding the pinout is not that hard.
You only need the datasheets of the 16C452 and the MC145404.

https://cdn.datasheetspdf.com/pdf-down/X/R/-/XR16-C452.pdf
https://pdf1.alldatasheet.com/datasheet-pdf/v … +/datasheet.pdf

The 16C452 provides TTL-level RS232 and thus needs the 145404 to translate this to the real rs232 norm (mostly around +-12V)

So you have to see which driver/receiver is connected to which port on the slot connector and then trace the driver/receiver to the uart.

ISA-Bus <-> Glue Logic <-> 16C452 <-> MC145404 <-> external connector

A simply multimeter in diode or continuity test is sufficient.

Just print out the pinouts, maybe mark the ins and outs in a different color and just measure your way trough ...

The harder part is getting to know the IO-ports ans IRQs needed to drive this card.
But there are ways to detect.

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