Re: REU Rom Socket?

From: Richard Atkinson (
Date: 2000-01-11 19:00:57

On Tue, 11 Jan 2000, Randy Winchester wrote:

> >What are these for?  was RAMDOS been implemented in ROM on some units?  any
> >binary images exist and info about the jumper configuration and memory map?
> RAMDOS was implemented in ROM on all of my 1750 REUs and about 2500 others
> that I know of.  I included RAMDOS (along with the patch to address 2MB) in
> KeyDOS ROM.  As far as the memory map, it's set up as a function ROM with
> the same addresses as a C128 internal function ROM (documented in the C128
> Programmer's Reference Guide), only in Bank 8 instead of Bank 4.  One of
> the big tricks with KeyDOS was to have the ROM check and remember its bank
> location, so the same ROM could be used either as an internal function ROM
> or externally in an REU.

I noticed that ROM socket too - but I haven't ever heard of REUs that used
it. Are you saying that they once shipped with RAMDOS ROMs as standard
from the factory? If so we really ought to have an image on funet! :)

What does the ROM socket look like to a C64? A LO or HI ROM?


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