Maybe try some 6114-120s: eBay: 7625843489 http://www.twistywristarcade.com/5-ram#/ (both mislabelled BTW) m ----- Original Message ----- From: "Gerrit Heitsch" <email@example.com> To: <firstname.lastname@example.org> Sent: Tuesday, May 15, 2012 5:11 PM Subject: Re: 6569 luminances > On 05/14/2012 07:37 AM, Gerrit Heitsch wrote: > >> >> Like here: >> >> http://www.ebay.de/itm/290695335618 >> >> From what I found via Google, the UL224D is a CMOS-Version of the 2114 >> made by ZMD in the GDR when it still existed. > > Since I wanted to find out, I ordered 5 of them and got them today. The > good news, they are 2114 compatible. The bad news is that they are > labeled 300ns but must be slower since a 2114-3 does work. > > I can access them from the CPU just fine (read and write), but VIC reads > garbage. The only explanation I have is the 74LS373 demultiplexer using > RAS which goes LOW about 150ns after PHI0 goes low. If the addresses > supplied by VIC are also 150ns or so late, this might explain why the > CPU can read the RAM while VIC can't. > > They might work in a VIC-20 though. > > Gerrit > > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2012-05-15 22:00:41
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