Eprom Emulation

[andy quaas]

I think this would work!  I have an 8052 Board that i built quite some
time ago.  Its got 8K or ram and 16K eeprom.  Would you want to use an
embedded processor?  It seems to me that would work the best.  And it
doesn't have to be hard, either.

My board actually has the 8052AH-BASIC chip, which has onboard basic. 
It works really well!  And not expensive, either.  All parts can be had
for prolly less than $50.  Except for the eeproms, depending on how
large they are.  But SRAM would be a much faster update..  But i we
only update one byte ata time, eeprom would be fine, too.

Andy


> Use several CMOS SPDT switches on each SRAM to the
> data/address bus (common
> to SRAM, NC to data bus for emulator, NO to EPROM
> socket) and use an
> inverter between the toggle lines of the SRAM1 and
> SRAM2 switches... when
> one is on the PCM bus the other is on the EMULATOR
> bus and vice-versa...
> all lines switch simultaneously, so there should be
> no problems when you
> switch programs...
> 
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>            David Cooley N5XMT           Internet:
> N5XMT at bellsouth.net
>      Packet: N5XMT at KQ4LO.#INT.NC.USA.NA   T.A.P.R.
> Member #7068
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