Re: Identifying ][+ motherboards

[mike@willegal.net]

On Oct 9, 9:58 pm, Nels Bruckner <ne...@comcast.net> wrote:
> On Oct 9, 5:34 pm, m...@willegal.net wrote:
>
>
>
> > On Oct 9, 5:39 pm, Nels Bruckner <ne...@comcast.net> wrote:
>
> > >      Here's a subject that I'm sure many of you have been over (and
> > > over) - How do I identify the age of an Apple ][+ motherboard?
>
> > >      I just picked up a complete ][+ and the motherboard in it appears
> > > to be older than the 4 other ][/+ motherboards that I have on hand.
> > > I'll post more specific details tonight after I take a closer look,
> > > but the details that struck me when I popped the top today at lunch
> > > were:
>
> > >      1978 copyright silkscreen above 6502, rather than 1979.
> > >      Extra RAM configuration jumper blocks or DIP sockets (empyt) to
> > > the left of each row of RAM.
> > >      No part number visible on the left-middle (i.e. no 820-0044-x, or
> > > similar, that I could see)
> > >      There is no sticker on the bottom of the baseplate. :(
> > >      Keystwitch / separate encoder style keyboard.
>
> > >      From my limited knowledge, I'm guessing this make it an
> > > 820-0001-06 or earlier.
>
> > >      --Nels
>
> > There are two basic versions.  RFI and earlier.  If you have memory
> > select jumper blocks on your board, you have one of  earlier
> > versions.  These blocks are usually labeled 16K, though apple made 4K
> > systems, too. There are several sub- versions of the earlier version.
> > I think that all except rev 0 have the rev number on the silk screen
> > underneath the 6502 chip. Pop off the chip and you should see the rev
> > number.   I have on my web site, what I think is a pretty good
> > description of the functional difference from rev 0 to later boards.
>
> >http://www.willegal.net/appleii/appleii-recreation.htm
>
> > Regards,
> > Mike Willegal
>
> > Regards,
> > Mike Willegal- Hide quoted text -
>
> > - Show quoted text -
>
>      I was all set to pull the CPU and look, when I noticed "REV 04"
> on the motherboard right in front of the slots (i.e. where Silicon Sam
> said it would be).  Niffty.  Definitely the oldest ][ that I have.
>
>      --Nels

Hmm I never noticed that before.   I checked both a rev 3 and a rev 4
that I have. Only the rev 4 has the rev number etched on the copper
layer at the bottom of the slots.

Regards,
Mike Willegal