FOUND! W: SRAM, 6116 or similar.

[e5frog]

Hi there.

 

I need some SRAM circuits for a small project.

 

I'm going to need 2kB and that's why I thought of the rather cheap 6116 that's 2k x 8 bits.

 

Other circuits might be of interest as well, as long as it is 5V SRAM.

 

 

Perhaps someone has spare circuits for an old computer, pinball machine or something like that.

 

 

I need 2 or 3 6116, if you have anything else - let's discuss it.

Edited October 7, 2008 by e5frog

[djpubba]

http://www.jameco.com/

 

They've got a ton in stock.

[e5frog]

They had some, yes...

 

I was also tipped about: http://www.futurlec.com/ICRAM.shtml

 

About the same price, question is how much shipping to Sweden is? At Jameco you're supposed to just pay and not get information about the shipping until they bill your credit card... not a very good system for the customer...

 

 

I don't know what speed I need... can you tell from the blue dotted (and one yellow) 2114:s in this picture?

 

 

 

 

How can I know if 150 ns is fast enough? As the whole unit is clocked at only 2.22 MHz or slower maybe there's nothing to worry about?

[djpubba]

I don't see a speed rating on any of the chips there. All I can advise is that the faster the rating on the new RAM, the less likely you'll have a problem. RAM rated for higher speeds runs fine at lower ones.

 

RAM speeds are listed in nanoseconds. I don't know enough about how it all works to say what that means in megahertz.

[e5frog]

The µPD2114LC that are on that SABA#20 pcb are apparently 450 ns (delay time I guess is more accurate than "speed"). So there should be no problem speedwise with the slowest and cheapest 6116 - which are 150 ns.

 

If someone has a broken VIC 20 of the C(ost)R(eduction)-version there's apparently 6116 circuits in that one...

[e5frog]

I got hold of a couple at school, I'll try one out and see what happens.

 

I also got a few NVRAM from a friend, 8k * 8, plenty of room there...