On Sat, May 11, 2019 at 03:35 PM, Lee Hart wrote:
Although I've never seen RCA 89052 anywhere, the RCA manual for this
I suspect that the 89052's were MW5114's that had a bad bit. Rather than
Microboard says that the replacement part is the MWS5114. Looking at
the supplied schematic, the chips are pin-compatible. The 5114
obviously has one more address-line, but that pin is tied LO on this
board, so the 5114 would just function like a 512 x 4-bit memory.
throw them out (RAMs were expensive back then!), they used them as
That makes a lot of sense - I wouldn't be at all surprised.
I hope to attempt a repair of this board in the near future - updates to
I have a tube of RCA MW5114's if you (or others) need any. I also have a
this forum when that happens.
couple tubes of 5101's (some RCA, some NEC). :-)
Thanks for the offer, but as I wrote that up, I did an eBay search for some more MWS5114's and already placed an order.
Bad timing ;-) Sometimes, this Internet thing can be too efficient.