Re: Enhanced //e with a 6503??!

[Don Bruder <dakidd@sonic.net>]

In article <1143905384.286995.27780@e56g2000cwe.googlegroups.com>,
 "BLuRry" <brendan.robert@gmail.com> wrote:

> I recently scored an enhanced //e (verified that it can display
> mousetext and DHGR) -- however, it was sent to me with a processor
> manufactured in mexico, labeled as a 6503.  This would NOT be the
> processor I would expect to find in any apple //e.  For that matter, my
> vulcan controller refused to start, crashing to the monitor at address
> $cc20 or so.  Fortunately, I was able to pop in the zip chip from my
> other //e and everything else was working just great afterwards -- so I
> know that the roms are intact and it can pass the onboard diagnostic
> test.
> 
> I read somewhere that the 6503 was a 6502 that could only address 4k of
> memory.  Is this the case?  If so, how the heck would it wind up in an
> enhanced //e manufactured in 1986 and why would it still be in the same
> 40-pin package?
> 
> Also, I noticed that this //e (MB dated 1986) has much fewer chips,
> noticably the row of 16 * 4k ram chips (like my 1982 //e) was replaced
> by 2 * 32k ram chips.   The 80-column card (also 1986) seems to work
> fine, but is like half the size of my older 1981 model extended 80-col
> card.  Is it just a reduced chip count because of bigger ram chips as
> well?
> 
> Any tips greatly appreciated.
> 
> -B
> 

The half-sized 80-column card is typical for "later" machines - 
Basically, 3 chips, on a card *JUST* long enough to fill the slot, and a 
chip-length tall. As for the smaller "on the motherboard" chip-count, 
yes, the larger capacity RAM chips mean there's no need for 8 of them 
when 2 will do the job.

Never even heard of a 6503 chip before. Definitely an odd-sounding 
critter.

-- 
Don Bruder - dakidd@sonic.net - If your "From:" address isn't on my whitelist,
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