Re: // c (peek)?

[dempson@swell.actrix.gen.nz (David Empson)]

In article <1993Nov27.125534.4911@pro-novapple.clark.net> lee@pro-novapple.clark.net (Lee Raesly) writes:
> We have a new member in our User Group that was just given an Apple //c.
>  
> How can he tell if it is the original //c (that needs the motherboard
> upgrade, or a later one that will work with the Unidisk? 

The upgrade to use the UniDisk is a ROM change, not a motherboard
change.  You need a motherboard upgrade to use Apple's IIc memory
expansion card - the later IIc models have a slot and software to
support an expansion card.  There is an Applied Engineering RAM card
which works in the older IIc. 

The other upgrade you may need is to correct problems with the serial
ports at relatively high communications speeds.  Some IIcs have
problems with some modems when communicating at 1200 bps or faster.
Fixing this requires a motherboard modification and a few extra components.

> Is there a Peek(nn) that he can do from Basic to tell?

Yes.  From BASIC, type PRINT PEEK(64447).  The number you get will be:

255   Original IIc, no UniDisk 3.5 support
0     IIc with UniDisk 3.5 ROM
3     IIc with memory expansion card support
4     IIc with bug-fixed version of memory expansion card support
5     IIc+

The UniDisk 3.5 support ROM may be available from your Apple dealer.

Failing that, you can buy it from Alltech Electronics.  A simple
modification to the motherboard is required to use the ROM.
-- 
David Empson                                                               
dempson@swell.actrix.gen.nz                                                
Snail mail: P.O. Box 27-103, Wellington, New Zealand