16 Nov
1998
16 Nov
'98
6:13 a.m.
On Nov 16, 5:39, Doug Spence wrote:
They're NOT the same. I can't find a pinout, but they're a different
(physical) size and ISTR they use different voltages as well. MPS6550s
will be very hard to find as they were never second-sourced by anyone, as
far as I know. They're 22-pin (0.4" wide instead of 0.3") 4096-bit (1024 x
4) SRAMs. 2114's are 18-pin 4096-bit (1024 x 4) SRAMs.
Even MOS Technology didn't make them for very long, which is why only the
earliest PETs used them.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
On Tue, 10 Nov 1998, Tony Duell wrote:
> The 2114 is getting hard to find now. A few
companies still have them
in
stock, but
AFAIK it's no longer in production.
Ack! I need a bunch of these to get a PET 2001 going (all of the 6550s
are bad, and I was told that the 2114 is the same part?) and a VIC 3K RAM
Expander fixed.