Re: Copying ROMS ?

I have verified that I can read and write other 27c64s and I also
tried swapping ROMS however there is another small glitch.

Apparently the HX-20 runs the programs out of RAM. I guess it loads
from PROM and runs from RAM. I removed all of the BASIC ROMs and
performed a hard reset and when it comes back, it's still running
BASIC, without the BASIC ROMs even installed. Wierd!

I have looked through the manuals to try and find a way to force a
reload but no go (so far). I might try removing the internal
batteries and see what happens.

The manual also mentions that one can use 27C64s in the HX-20. There
may also be one other thing that is causing the problem. I am trying
to read the ROMS using family/pin codes for other ROMS. I don't find
that part number and have tried a number of other 8K ROM fam/pin
codes and none give me anything but blank loads.

Perhaps that is part of the problem?

Mike

>
> Verify that you can read another 2764 (incase you have reader
> problems).
>
> Can you swap the 2764 for the Masked ROMs & work without changing
> jumpers/settings/wiring?
>
> I see there are a few HX-20 collectors on the net, they may be more
> informed.
>
> Kev
>
> >
> > I think I understand what you are saying. I'm sure they are Masked
> > ROMS or at least that would make sense. They are a 4 chip chipset
> > with numbers: EPSON BASIC1R0 M64020AA to M65023AA.
> >
> > The thing is however, that in identical machines, the other EPROMS
> > are 27C64 so the pinout would seem to have to be the same or the
> > EPROMS would not work right in the other identical machines, would
> > they?
>
>
>
>
Received on Fri Jun 21 13:26:24 2002