Re: Apple IIc upgrade

[spector@vax2.concordia.ca (Mitchell Spector)]

In article <454295518.4702893@snac.mv.com>, teadams@snac.mv.com writes...
> 
>There were at least 2 different Apple IIc's built by Apple. The earlier ones

	Actually there were four different Apple IIc CPUs released between
1984 and 1987, though in terms major changes to the motherboard, two would
be correct (original IIc and Memory Expandable IIc, other two revision that
fell inbetween merely had new firmware or minor circuity fixes). A fifth
model was released in 1988 but with many new changes; the Apple IIc Plus.

>below a certain serial number, (unknown at this point) needed a crystal
>upgrade to allow for proper telecommunication work at speeds over 2400 bps.

	Apple IIc CPUs manufactured before November/December 1984 were
affected. In most cases CPUs could not handle data above 300-1200 baud 
through their serial ports due to a timing problem. A 74LS161 chip at
location C7 on the motherboard identifies that you have "bad" ports.

>This was a free upgrade offered by Bpple BUT with a time frame. That time
>frame ran out back in the 1980's if memory serves me. 

	The free upgrade (a complete motherboard swap, which in later years
was also done for ROM upgrades) expired May 3, 1995. In fact I believe all
Apple IIc upgrades were discontinued on this date.

>Since the Apple IIc hasn't been built for many years, I am not surprised that
>nobody at apple knows about it now.

	I don't feel that's an excuse, more a case of ignorance and negelect
on the part of Apple Computer. I've called Apple Canada's main headquarters 
and _not one_ person even knew what an "Apple II" computer was! Eventually they
looked it up in a book and found instructions that persons requesting Apple II
information should be forwarded to Quality Computers for support. Unfortunately
these days QC may turn out to be yet another dead end. :/

>Tim Adams
>                  A service for the membership of
>               Southern New Hampshire Apple Core
>                         Manchester User Group

Mitchell Spector
spector@vax2.concordia.ca