From: Marko Mäkelä (
Date: 1998-09-18 08:19:18

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.

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?


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