Re: Apple II+ revisions

[david@uow.edu.au (David Wilson)]

W Stewart <waynes@intergate.bc.ca> writes:
>There were at least 2 other boards made. the first is the memory
>select version. Back when memory prices were high it let you use
>4k chips instead of 16k. The other one is 820-0044-01 which I
>tend to rhink was the second model.

>I think it's unlikely this will get into the FAQs, partly through lack
>of demand and possibly lack of anyone one with knowledge of the
>minor changes.
>Also most are sort of a  collectors item and are lucky to be booted
>once a year.

>"Brian A. Davis" wrote:

>> I have a 820-0044-C board in my Apple ][+ and in my Europlus machines.
>>
>> What are the differences between the A, B, C, & D boards? Is this
>> information in the Apple ][ FAQs?

I have most of this information at home in Jim Sather's Understanding the
Apple II. The A - D boards are (if I remember correctly) the RFI revisions
(ie the motherboard was modified to reduce the RF interference it put out).
All are effectively the same. Prior to the RFI boards there were about 8
versions. These do have some significant differences - Rev 0 has only 4
HIRES colors, Rev 7 can take a standard EPROM in its chargen socket, the
4K/16K select blocks were removed at some point, etc.

If you want I can type in the full details.
--
David Wilson  School of IT & CS, Uni of Wollongong, Australia  david@uow.edu.au