Re: Alternative Methods of Copying Apple II+ ROMs

["Bryan Villados" <news003@macgeek.org>]

Well, the logic board arrived. Plugged it in and it powered up properly!!!
=^-^=  Thanks guys for verifying the EUROPLUS information.

Here's a scan of the EUROPLUS logic board. It's under 600K, and it's large
enough and clear enough to read everything. Things I found interesting are
the following sections:

http://www.macgeek.org/temp/a2europlus_front.jpg

C2 - between ICs 74LS153 and 74S195 but below them. There's a 6-pin
connector. Anyone know what that's for?

Keyboard ROM - Note that the ROM is actually an EEPROM with a label
covering. Was there a time when Apple shipped these boards with EEPROMs? Or,
is this something done by a pervious owner?

K14 - There seems to be two sets of 4-pin connectors. I know one of them is
for video out to a RF modulator. What's the other connector for?


--- Bryan

"Eric Smith" <eric-no-spam-for-me@brouhaha.com> wrote in message
qhr869jpyn.fsf@ruckus.brouhaha.com">news:qhr869jpyn.fsf@ruckus.brouhaha.com...
> "Bryan Villados" <news003@macgeek.org> writes:
> > Sorry if I'm being a nuicance about this... A previous thread on the
> > EUROPLUS is confusing me, which is why I started this thread. Quadrajet
> > wrote the following awhile back:
> >
> > "One thing different I recall about the Europlus was a few pad jumpers
on
> > the motherboard to change some timing from 60 Hz to 50 Hz AC power
systems."
>
> That is incorrect.  The output of the power supply is +/-5V and +/-12V
> *DC*.  Aside from the power supply, nothing in the Apple cares what the
> line frequency is.
>
> The jumpers and bowties on the logic board control the video frame rate,
> so that depends on which video standard you want to use, not the AC
> frequency.  For instance, I'm in the US where we have 60 Hz power, but
> I own some computers that produce PAL video at a 50 Hz frame rate, and
> I have a Tektronix studio video monitor that will display PAL.  So all
> of this is powered from 60 Hz but using 50 Hz video.