ncoplin_at_orbeng.com
Date: 2002-08-22 09:27:40
Hi all,
-----Original Message-----
> ST> selected. If the CS is not generated on write, the R/W logic is
> Ah, major gotcha. Yep, doesn't work, back to the drawing board :)
>anyway, why not generate the CS on our own? We can CS when we get a
I've used a 74138 to decode 8k chunks allow writing to external RAM at
$8000. During "writes" both the internal and external RAM get written to
though! The external RAM's CS needs to be ORed with the ROM-select to ensure
it then responds as a "ROM". A switch (mechanical or electronic) can be used
to disable writes.
- Nick
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