--- THETechnoid_at_home.com wrote:
> Check your supply and signal voltages and cut traces/reroute power or
> things might be interesting.
>
> Regards,
>
> Jeff
>
> In <002b01c0c860$162ae760$9cc762d8_at_idcomm.com>, on 04/19/01
> at 02:32 AM, "Richard Erlacher" <edick_at_idcomm.com> said:
>
> >> If you're not trying to build an exact replica, but just something that
> >> will work, you could use a more modern SRAM, like a 6264 (8K*8)...
In the case of the 1802, that's not an issue. The "original" SRAM for
the Elf is a pair of 1822s - CMOS, single supply voltage (unlike early
EPROMS (1702) and DRAMS (4116 and earlier). Due to the fact that most
hobbyist 1802 designs had some TTL (like the cool TIL311 displays in
the original P-E article and on the Quest Elf), they were run with a
regulated +5VDC supply. A 2016 or 6264 or similar SRAM will work just
fine as is; add a latch for the upper address bits to use it all.
-ethan
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Received on Thu Apr 19 2001 - 08:37:22 BST