2716 with 100 nS access time ?

[Don North]

Jos Dreesen / Marian Capel wrote:
>
>> 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
>
>
>

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