Found these inside a non-working 71B

[Dave Frederickson]

(03-15-2018 05:09 PM)MikeSD Wrote:  Thinking out of the box
* I have a ton of 4K RAM boards, from salvaged 71Bs.
* And I have 4 unused front ports.
* And, I bet I could wire in some special connectors deep in those ports, to allow a kludged 8K RAM, made of 4K,
* to be inserted in and plugged into a special connector THAT wouldn't interfere with a standard plugin, if the RAM was removed.

Think that's possible? Can 8K RAMS be made, or do only 4K, 32K and 64K work as a group.

OR, I could put as many together as I could, that might fit in the Card Reader Port. Would like to find a good use for the 4K RAMs.

The key to that is being able to configure LCIM via the ID pin on the Saturn Bus to Memory Controller, except it's built into the HP 4k modules. You can put sixteen 4k modules together, but all you get is sixteen 4k ports, not a single 64k port.

The best use I've found for 4k modules is filling up front ports when selling a 71 on eBay.

Dave