31 Jan
2012
31 Jan
'12
5:23 p.m.
On Jan 31, 2012, at 12:06 PM, Ethan Dicks wrote:
The Color SRAM is a 2114. Very ordinary and, in my
experience, prone
to failure.
If you have another C-64, you could try swapping the PLA. You will
need an 18-pin socket for the SRAM. The chips are available from a
number of surplus places like Unicorn Electronics, BG Micro, and more.
Speed ranges for the 2114 are, IIRC, 250ms-450ms. I don't remember
what speed the C-64 requires, but you can typically sub a faster chip
than the circuit requires.
Jameco has 200ns ones for $2.49 each:
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_38973_-1
I'm not familiar with BG Micro (yet), but I know Unicorn has a hefty minimum, which
Jameco does not (while you're there, though, you might as well pick up the socket as
well and maybe some spare parts (like more 6502s).
- Dave