Re: Newbee Questions

[David Wilson <mcs6502@gmail.com>]

On Jan 14, 10:37 pm, Eric Rucker <bhtoo...@gmail.com> wrote:
> On Jan 14, 1:10 am, David Wilson <mcs6...@gmail.com> wrote:
> > The IIc ROM revisions were FF (original), 00 (3.5DISK), 03 (MEMEXP),
> > 04 (MEMEXP bugfix) and 05 (IIc+) so if you have a ROM00 you do have
> > UniDisk 3.5 support.
>
> Hrm, I forget where I got the "revision 0" nomenclature... I thought
> it was the Apple II History, but it doesn't seem to use it. Maybe it
> used to in the past or something. (Under that nomenclature, 0 is
> original, 1 is the modem bugfix, 2 is the UniDisk, 3 is memexp, 4 is
> the memexp bugfix, and 5 is the +.)

That is one too many revisions. The modem fix was a hardware change to
the original IIc motherboard. There are 4 motherboards, most of which
can use two ROM revisions.

Original m/b with slow serial port - ROM FF or ROM 00
Original m/b with fixed serial port - ROM FF or ROM 00 (xtal osc
replaces 74LS161)
Memory Expandable m/b - ROM 03 or ROM 04
IIc+ - ROM 05

I have actually put a ROM 04 in my original m/b - it works fine but
without the socket on the m/b I cannot use an Apple IIc memory card.

> Anyway, mine has ROM FF.

Can you burn an EPROM? You can upgrade to a ROM 00 if you want.