SV: 606 Is Working :)

[*Star Project]

Hey.

Great to get it working again.
I guess the memory chips in the 606
is 1Kx4bit as in the 303. One way that
im approching with replecing my own 303
memory chips to make a "new" sram PCB
and place it right over the old chips.
So if you place 3 empty sockets with long
legs right over the old ones and and place
sockets of the new chips besides them.
Them you draw lines between the different
adress lines and WE^ and so on form the
emtpy sockets to the new chips sockets.
I got a sketch of such a PCB layout for
replacing the 303 memory with 32K x 8bit
chips. I would guess my ayout contains
some errors and sure could get a better
routing but its just a first layout so.
the adress lines that doesnt connect to
anything is conencted to a switch which
sets them either +5V or 0V.
1K -> 32K that means 5 switches and 32 times
the capacity. one way to increase it further
would be to use the other left over 3 I/O
lines and switch between I/O 0-3 and
I/O 4-7.
Remember no battry backup is present yet
in the sketch.
Hope it helped a little anyway.
/ Andreas H

http://members.tripod.com/atomictroop/DIY/1Kx4b-32Kx8b.jpg


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Från: owner-synth-diy at node12b53.a2000.nl
[mailto:owner-synth-diy at node12b53.a2000.nl]För Plutonique9
Skickat: den 13 januari 2001 21:37
Till: synth-diy at node12b53.a2000.nl
Ämne: 606 Is Working :)


Thankyou to everyone who helped me regarding my non-working 606.
I decided to try and replace the RAM in the unit, I couldn't find an
exact match, so I replaced it with UM6114. I don't know if this will
draw to much current for memory retention, but at least it tells me
it was the memory which was failing. Its funny though, they looked in
perfect shape, no corrosion or anything, I really guessed this one :)

While I am at it, I curious about how you go about expanding the
memory on the 606, my 808 sure would dig it as well.
Any resources I should be reading to understand how to achieve this?

Danka!!!


-- Plutonique9, Plutonique9 at symbiocom.com on 01/13/2001