Re: Q: APPLE // PLUS

[david@wraith.cc.uow.edu.au (David E A Wilson)]

dempson@atlantis.actrix.gen.nz (David Empson) writes:
>The major differences between the IIc+ and earlier IIc:

>- the IIc+ has a built-in 3.5" drive (400k/800k, compatible with the
>Apple 3.5 Drive) instead of a 5.25" drive.  You can connect another
>external 3.5" drive and/or two 5.25" drives.

According to Apple //c Tech Note #8 the internal drive cannot use 400k disks:

:Apple IIc
:#8:    Single-Sided 3.5" Media and the Apple IIc Plus
: 
:Written by:    Llew Roberts                                          May 1989
: 
:This Technical Note describes a media limitation on the internal drive of
:the Apple IIc Plus.
:_____________________________________________________________________________
: 
:With the exception of the internal drive on the Apple IIc Plus, single-sided
:3.5" disks are supported on all Apple 3.5" drives, including external disk
:drives connected to an Apple IIc Plus.  The IIc Plus internal disk drive
:assumes that all disks have an 800K capacity, so it returns valid reads on
:blocks which occur on the formatted side and I/O errors on blocks which occur
:on the unformatted side.  A disk may appear to work when the disk-reading
:algorithm has read blocks only from the formatted side.

>- the IIc+ has a built-in accelerator, which runs the processor at 4
>MHz.  In effect, this is identical to a 4 MHz ZIP CHIP being built
>into the machine.

It uses it's own firmware routines to enable/disable/configure the accelerator
so may not be Zip Chip compatible at the hardware level.

>- the mains supply is built into the computer instead of requiring a
>separate "brick".  The main disadvantage of this is that you cannot
>power the IIc+ from an external DC supply such as a car battery.

The other disadvantage (for Aust/NZ users at least) is that it was a 110v
supply only.
-- 
David Wilson	Dept CompSci Uni Wollongong Australia	david@cs.uow.edu.au