Re: Jeri board and extra things

From: Marko Mäkelä (
Date: 2001-05-02 13:00:32

On Wed, 2 May 2001, Ruud Baltissen wrote:

> If one can reprogram his PC's FLASH-BIOS, it cannot be so difficult to add
> this feature to our new design as well.
> On the other hand I like the suggested idea of loading the KERNAL in SRAM
> but not from EPROM but from disk like an OS. Even a combination should be
> possible.

A flash ROM can be reprogrammed a couple of hundred thousand times. Wiring
it to the system can be as easy as connecting a static RAM chip. The
read/write sequence that enables writing to the flash may depend on the
chip manufacturer.  But you won't need any special voltages or circuitry
for that; only software is involved.  For the 2-megabyte flash Am29LV160D,
the shortest writing sequence is 2 or 3 bus operations per byte.  To avoid
accidental rewriting of the flash, you could of course add a switch to the
-WR line.


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