Dear Friends,
I'm trying to get 2 CMOS static RAM chips 256 x 4 (300ns or better) reference
HM6561 from Intersil or another vendor.
Could you help me to get these?
Any static RAM is going to be better than those, larger capacity and
faster speed. Unless this is to replace RAM in some existing equipment,
one might as well start with higher density cmos RAM, if you don't need
the extra space just set the unneeded address lines to a stable state.
Even if this is to replace RAM in existing equipment, it might be easier
to build some sort of adapter to plug in than try to find such old RAM.
In 1976 it was a great way to get some RAM with the RCA Cosmac Elf, but
even then it was a pretty small amount of RAM.
I don't know what's available these days, but there was a whole wave of
CMOS RAM that had the same basic pinouts as standard ROM. Or when this
sort of question came up even some years back, someone suggested cache
RAM off an older motherboard, it was something like 24pin package but
a narrow DIP.
Michael
