RE: setting jumpers on GS memory board

[David Troeh <dst1980@MailAndNews.com>]

By trial and error (more former than latter) I figured out that the top 
jumper 
must be closed to be able to use the first set of 8 sockets (rest of top 
row).
 To use the whole board, both jumpers must be closed.  The chips that go in 
the sockets are 256Kx1 chips, and if I recall correctly they must be running 
at 150ns or faster (-15 or less at end of chip number).  The first set of 
chips must be 8 chips in sockets A9 through A16.  B1 through B16 must be 
filled all at once, not by eights, as far as I can tell.  Hope this helped.

>===== Original Message From Robert Jensen <bob_jensen@jhuapl.edu> =====
>I recently acquired a ROM 01 GS. It includes a memory board that
>has 256 kb soldered on and 24 empty sockets. It also includes two
>jumper locations on the board toward the front of the machine.
>The jumper pins are not perpendicular to the board. The top pair
>make a right angle bend up and the bottom pair make a right angle
>bend down.
>
>I have no documentation and all I know about GSs comes from playing
>with the Bernie emulator.
>
>If I add more memory, do I need to configure the jumpers? The top
>row of memory is labeled A1 through A16 (1 through 8 are filled)
>and the bottom row is labeled B1 through B16. Does it matter where
>additional memory is placed if the board is not fully occupied?
>=========================================================
>Bob Jensen
>bob_jensen@jhuapl.edu

--David Troeh (dst1980@MailAndNews.com)
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