From: Ethan Dicks <ethan_dicks_at_yahoo.com>
>> 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)
Look for 2101 or 5101 (moto called them 145101) they are all the same.
>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.
At 2mhz clock it wants 500ns or so rams, at 1mhz you can use 1uS
(1000ns!)
parts easily.
If the writer cant find any let me know... I have some.
Allison
Received on Wed Apr 18 2001 - 18:16:05 BST