[sdiy] transistion from 7489/74189 to more modern ram??

[Ullrich Peter]

Hi!

I could offer you a lot (some hundreds, unused) of 2148 (1024bit x 4) static RAMs. They are pin compatible with the old 2114 SRAMs but faster.

They are in 18 pin DIL:

name:         2148
function:     1k*4 SRAM
package:      DIP,18
manufacturer: Intel

                +--()--+
3-State Outputs | 1  18| VCC
             A5 | 2  17| A7
             A4 | 3  16| A8
             A3 | 4  15| A9
             A0 | 5  14| D0
             A1 | 6  13| D1
             A2 | 7  12| D2
            /CS | 8  11| D3
            GND | 9  10| /WE
                +------+

Ciao
Peter

http://www.ullrich.at.tf


-----Ursprüngliche Nachricht-----
Von: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] Im Auftrag von dan snazelle
Gesendet: Mittwoch, 14. Dezember 2011 21:56
An: synthdiy diy
Betreff: [sdiy] transistion from 7489/74189 to more modern ram??

I have bumped into a few projects recently that implement TTL RAM. 
these RAM chips are extremely straight forward compared to later RAMS i have seen.

however, they are RARE and expensive.

So I was wondering if anyone had advice on a relatively easy to get RAM chip that isnt too hard to use?

also...if anyone knows of a book out there that has a more in depth study of RAM and how to use it than the CMOS cookbook, I would be grateful.

thanks!

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