18 Apr
2001
18 Apr
'01
11:04 a.m.
--- Demon02554(a)aol.com wrote:
ok...i got my CDP-1802s so that i can build the COSMAC
Elf...
now i just need the RAM that the schematics have....i believe that it is 2
256x4 RAM chips...if anyone has these or can let me know where i can find
them could you please let me know
I've seen places with the 1822s for sale in the past couple of years. It's
not the same, but B.G. Micro has 2102s for <$1 each (the web page from their
online catalog is at http://www.bgmicro.com/pdf/page5.pdf)
You could always use a more modern 2016 or 6264 or such and just tie the
upper address lines to 0. You can scavenge those from old Ethernet cards
and the like. The speed requirements of the 1802 are not harsh. I think
you can get away with 450ns RAM on a 1Mhz design.
-ethan
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