On Mar 2, 9:19 pm, Derek Morton <[email protected]> wrote:
> Or... Use a flash ROM and copy it... Hmmmmmm... What an
> interesting idea... It would require some sort of adapter for the
> flashing... Probably something which would plug into the PDS
> slot... A small application to perform the copying / programming.
The utilities for the various emulators which will make a ROM image
text file when the application is run on the target machine work just
fine. There's no need for any kind of funny adapter.
Once one has the ROM image text file, it can be used by a [E]EPROM
programmer to program flash chips. The remaining issue is that you
have one monolithic file and typically the ROM image is interlaced
across four or more chips (32 bit wide data bus, 8 bit wide flash
chips). However, the software for many programmers can be set to
span the image file across multiple chips. So again, no special
equipment needed, except a chip programmer, which would be needed any
way.
I confirmed the first paragraph by physically removing the ROM chips
from a IIci and reading their contents. Then I downloaded a complete
ROM image from a IIci using one of the software utilities and split
the image up using a chip programmer. The split images from the chip
programmer exactly matched the contents I had read directly from the
ROM chips.
Jeff Walther
Jeff Walther
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