4 Jun
2012
4 Jun
'12
7:45 p.m.
On Sun, Jun 3, 2012 at 1:42 PM, Ethan Dicks <ethan.dicks at gmail.com> wrote:
My Dilog boards are, according to the paper labels in the upper-left
corner, SQ3703As. ?One is marked Rev G and looks clean. ?The other is
a Rev E with a few green ECO wires (the Rev E board has an EPROM
marked "Rev G", and the Rev G board has firmware marked "Rev H".
I'm guessing there isn't a lot of info out there to attempt to see if
it's possible to "convert" an SQ3703A to an SQ3706A in the field, but
if anyone knows anything about both boards, I'd be game to try if it's
EPROMs or PALs or whatever.
-ethan
On my SQ3706A, REV H, I have the following socketed GAL devices:
13U 92771A
18U 92769A
19U 92773A
26U 92774A
34U 92770A
57U 92775B
74U 92772A
The firmware is U46 92734, REV L
57U is the only device that is not a Nat Semi GAL, and the only device
with a 'B' suffix. That plus its location adjacent to the DILOG QBIC
ASIC leads me to guess that device is most likely the CSR decode
device. I suppose it wouldn't take much to check the pins of this
device and see if they lead to the BDAL lines through the AM2908 quad
bus tranceivers.
What part labels do you have on the socketed GAL devices on your
SQ3703A? Do they happen to match the part labels that I have on my
SQ3706A except for U46?
I might not take too much to figure out how to convert a TMSCP SQ3703A
into an MSCP SQ3706A.
Ok, I'm now getting lined up to acquire an SQ3703A. When it arrives
I'll compare the two and see if I can figure out how to do a
conversion as I did with CMD CQD200 and CQD220 boards.
-Glen