Re: Problem with IIc!

[nathan@visi.com (Nathan Mates)]

In article <50q3f6$566@news.emi.com>, Edhel Iaur <drsmooth@relex.com> wrote:
>>Tony Cianfaglione (tony@ccn.cs.dal.ca) wrote:
>>:    I have a IIc (version 255) that has several ' and @ marks blinking on 
>>: the screen upon boot up and loading into Basic.System.  Using MouseDesk 
>>: or Apple II Desktop just gives me a messed up screen and the mouse 
>>: movements leave 'droppings' (like an echo-trail) everywhere it is moved on 
>>: the screen.

>>:    Looking inside, the 65C02 looks burnt (browned) as if the computer had 
>>: never been turned off.

>Maybe you could buy the //e enhancement kit, and replace only the
>65C02 chip? (I THINK it's socketed...)

    The processor in most to all Apple IIs has been socketed. (Except
for laptops and game consoles, I'd be surprised if a system didn't
have it socketed. Workstations, PC, Apple IIs, etc that I've opened up
were all socketed.) This allowed drop-in replacements for the 6502
and 65C02, such as that in the enhancement kit, ZipChip, etc.

   You could probably find a new 65C02 for <$5; no need to purchase
the enhancement kit. Most //es actually had 2Mhz 6502/65C02s-- the
extra processor speed allowed it to send memory requests out to the
bus a little faster (might have been needed), but the system is still
locked down to the 1Mhz clock signal. Running a chip slower than its
rated speed is usually just fine.

Nathan Mates

--
<*> Nathan Mates http://www.visi.com/~nathan/      <*>
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