From: Henry Sopko (
Date: 1998-09-18 08:48:51

On Fri, 18 Sep 1998, [ISO-8859-1] Marko Mäkelä wrote:

> On Fri, 18 Sep 1998, Henry Sopko wrote:
> > Does anyone know the what speed a eprom must be for it to work in the
> > C64? I have two eproms that are 350 ns, and fail in my C64.
> The slowest DRAMs I've seen in a C64 are 300 ns.
> > They do okay in my VIC-20. Is it the speed? 
> It shouldn't be, since (in the case of NTSC) both machines run at the same
> clock speed.  But on the other hand, the VIC-20 has some buffer chips on
> the bus that the C64 doesn't have.

Maybe that is why they work okay in the VIC-20 and not in the C64.

> But why don't you use a normal 2764 or 27128 EPROM?  The pinout is not
> that much different.  BTW, does anyone know where one could buy nicely
> built 2764->2364 adapter sockets?

Yes, I could use the 28 pin eproms you mentioned above with a little work,
but I wanted to do a easy replacement of the 24 pin type. 


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