what might this isa board do?

From: Fred N. van Kempen <waltje_at_pdp11.nl>
Date: Mon Jul 21 03:45:00 2003

On 20 Jul 2003, James Carter wrote:

> i suppose it could be a plain old memory board, but 1992 seems very late
> for that (but still classic :-).
>
> the faceplate has two stickers, one for the serial number (1074) and the
> second has "HYPERTEC R9_BC HRAM CL EX SIMM".

Looks like an address-selectable upper-space memory board. These were
often used in conjunction with EMS/LIM drivers to allow for drive caches
and the like- I still have an AST RAMpage card for that... could have up
to 8x 1MB SIMM. I only used it with 8x256KB, as 1MB's were out of my
reach, then.

The "starting address" stuff probably sets an address in the upper mem
range (C0000 - EFFFF) of the peecee, where you can tell the LIM/EMS
drivers where the extra memory is, and how "deep" (how many pages) it
is.

--f
Received on Mon Jul 21 2003 - 03:45:00 BST