Calling ApleII experts......

From: peter tremewen <ptremewe_at_bigpond.net.au>
Date: Sat Jul 26 19:35:00 2003

Thanks for the tip,

         If I can learn if this was done or not, and how it was done, I'll
build an "adaptor" to make sure I get the signals around the right way, and
everything else in the correct spots. It's not the first time I have heard
of manufacturers of computers doing this.

                The Sinister Dragon.


> > > contents of the Eprom I can burn it from a file and test it if
necasary.
> > You most likely don't need to go through all that trouble. Just take
the
> > ROMs from any other Apple ][ motherboard and pop them into this one.
For
> > minimal system operation you can just transfer ROM F8. For BASIC, you
> > also want ROM-D0, ROM-D8, ROM-E0, ROM-E8 and ROM-F0.
>
> I seem to recall it's necessary to be a bit careful with this - the
original
> Apple II series (II, II+) used ROM ICs that were basically pin-compatible
> with standard EPROMS, but had an inverted enable line or something of the
> sort. Clone manufacturers simply used normal EPROMS. Hence, even if the
> actual contents of a clone EPROM is the same as the original Apple II ROM,
> you can't swap the two and have it work.
Received on Sat Jul 26 2003 - 19:35:00 BST