Clearpoint Q-RAM 11 chip locations
jnc at mercury.lcs.mit.edu
Wed Sep 16 08:19:48 CDT 2015
Documentation for the Clearpoint Q-RAM 11 board seems to be rather scarce;
all I could find was a user manual, with no technical info (manual or prints
or other documentation) online. (I'd be glad to be proved wrong! :-)
So as part of a project I needed to figure out which memory chips were which;
now that I've worked it out, I'm putting that info online here in the
archives, where eventually Google will find it, and make it available to
anyone who needs it.
So, looking at the card from the component side, with the handle at the top,
and the contact fingers at the bottom, there's an array of memory chips 12
columns wide, and 6 rows high; I see no ID system on the card, so I number
the columns A-L (from the left), and the rows 0-5 (from the top). The card
can have 4 banks of 128KB each, for a max total of 512KB.
The chip-bit relationship is pretty random:
Bank 0 - Columns A, E, I:
Bank 1 - Columns B, F, J:
Bank 2 - Columns C, G, K:
Bank 3 - Columns D, H, L:
The banks 2/3 column assignments are a guess, not verified as yet. The bit
allocation seems to be the same in all banks; I tried a few in bank 1, and
they matched the ones in bank 0 (suitably offset in column, of course).
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