26 Jan
2008
26 Jan
'08
12:49 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
11:49 a.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
6:41 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
6023
days inactive
6023
days old
2 comments
3 participants
participants (3)
-
ak6dn＠mindspring.com -
cclist＠sydex.com -
jos.mar＠bluewin.ch