Back in the day, RCA offered several CDP1802-based development
The good news is that the board was still basically functional...I suspect that the 89052's were MW5114's that had a bad bit. Rather than throw them out (RAMs were expensive back then!), they used them as 512-byte RAMs.
I hope to attempt a repair of this board in the near future - updates toI have a tube of RCA MW5114's if you (or others) need any. I also have a couple tubes of 5101's (some RCA, some NEC). :-)
Fools ignore complexity. Pragmatists suffer it. The wise avoid it.
Geniuses remove it. -- Alan Perlis, "Epigrams on Programming"
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com