View Full Version : Mystery RAM Expansion Card

June 24th, 2017, 11:18 AM
Hello all! I just picked up an IBM 5170 this weekend from an estate sale (I haven't powered it up yet), and included with it was a strange RAM expansion card, and it's missing several chips (presumably ram chips).

The only identification I can find on it is "PE-520 16M10". The current arrangement of onboard RAM chips consists of a million different brands of a million different models that range from 64 to 256kb, and I doubt it's supposed to use both of them within the same RAM banks. There's a total of 36 sockets. It was clearly a project card of the person who owned it before me, as there was an old DTK 8088 motherboard with no ram chips sitting in the same box (it used to have 41256 chips). Does anyone know what this card goes to and what the proper ram type is for it?

It appeared (based on other parts from the sale) that the previous owner had a Tandon 8088 machine at some point. Maybe it belonged to it? Or is it some aftermarket expansion card for the IBM?

Photo 1 (https://drive.google.com/file/d/0BxmBXvQ6gF3PYmtqVkNxR1pnX1E/view?usp=sharing)
Photo 2 (https://drive.google.com/file/d/0BxmBXvQ6gF3PN0lXTk1QbmxjUEk/view?usp=sharing)
Photo 3 (https://drive.google.com/file/d/0BxmBXvQ6gF3PZTFEdnVHMW5nSkk/view?usp=sharing)

Any input is appreciated

June 29th, 2017, 06:03 PM
This looks like it:

Looks like it doesn't support 64K chips. So looks like your right, its been used to store all sorts of RAM chips.