Re: Identifying ][+ motherboards

[mike@willegal.net]

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