[sdiy] on the search for some MXR Digital Delay memory chips

[Travis Shire]

http://arcadecontrols.com/BBBB/parts.html

Bob Roberts has the @$4 each. Great guy to deal with, but funny about
payment....doesn't like credit cards and *hates* Paypal.

4164s are around 1-2$ each. I'd still go that route. Eventually these
antique Intel 4 bit rams are going to be gone for good so you'd be wise to
use more available (and reliable)  parts to keep the equipment in service.
And since its digital it won't affect the sound.

Speaking of arcade games....its a common "hack" to change the 4116 rams (3
supply, PITA...in early Williams games such as Defender, Robotron, Joust,
etc) to the 4164. It takes stress off the pwr supply, and eliminates all the
flaky behavior associated with the triple supply ram. We used to have to mod
the pwr supplies in those to make sure the -5v rail came up as quick as the
+5 and +12, else you'd get error codes screaming that a ram was bad when it
actually wasn't.





> I can't tell how many are in each unit because they are in the repair
> shop [and I'm having to source parts to finish the job]. :(
>
> Albeit a great and lovely idea, unless you or someone else is willing
> to redo the ram storage in 2 of them for less than $350 with parts, I
> can't see how it would make sense since these things, in working
> condition, go for $350-500 used. I have $150 in repairs and $250 in
> purchase price for the units themselves.
>
>