26 Jan
2008
26 Jan
'08
5:49 a.m.
Date: Fri, 25 Jan 2008 21:11:26 +0100
From: Jos Dreesen / Marian Capel <jos.mar at bluewin.ch>
I need a programmable device, with the standard 24 pin
layout, with 100nS
acces time. 2716's are 350ns to 450ns, 2816's are 150nS match. What other
options do I have ?
How about a NV SRAM, such as the DS1220? 100 nsec, 24-pin JEDEC
pinout. Or an ST M48Z12, same-oh pinout and capacity?
Are you trying to replace something like an 82S191?
Cheers,
Chuck
26 Jan
26 Jan
4:49 p.m.
How about a NV SRAM, such as the DS1220? 100 nsec,
24-pin JEDEC
pinout. Or an ST M48Z12, same-oh pinout and capacity?
These look like the best option.
Are you trying to replace something like an 82S191?
Indeed , I have a CPU with 40 bit wide microword (5x 82s191).
I would like to replace the instructions for read sector, write sector and set track.
Target is to use an IDE drive instead of the original cartridge drive.
Jos
11:41 p.m.
Jos Dreesen / Marian Capel wrote:
The CY7C264 (UV EEPROM 8Kx8 24p/600mil, 45-55ns) is a direct drop in
replacement for the 82S191. The two extra chip selects on the '191 are
upper address lines on the '264; just alias your '191 image four times,
and drop in the '264.
CY7C264 can be found on ebay most any time. A typical good price is
$4-$6 each in small quantity.
Don
AK6DN
How about a NV SRAM, such as the DS1220? 100
nsec, 24-pin JEDEC
pinout. Or an ST M48Z12, same-oh pinout and capacity?
These look like the best option.
Are you trying to replace something like an 82S191?
Indeed , I have a CPU with 40 bit wide microword (5x 82s191).
I would like to replace the instructions for read sector, write sector
and set track.
Target is to use an IDE drive instead of the original cartridge drive.
Jos
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