Re: Apple //c++ experiments...

["William Garber" <willy46pa@garberstreet.com>]

"John" <zzzjoki@yahoo.com> wrote in message 1186900255.701363.179420@q3g2000prf.googlegroups.com">news:1186900255.701363.179420@q3g2000prf.googlegroups.com...
: On Aug 11, 4:37 pm, "Michael J. Mahon" <mjma...@aol.com> wrote:
: > I recently acquired a //c+ (Yay!), so I decided to try replacing the
: > 16MHz accelerator oscilator with a 32MHz oscillator to bump the speed
: > from 4MHz to 8MHz (making it a "//c++"  ;-).
: >
: > I was concerned that simply replacing the oscillator might shorten
: > the "slowdown" times for slow slots and the speaker and joystick,
: > which could pose a problem.
: >
: > The answer is that the slowdown times are timed by counting down
: > the 1MHz Apple bus clock, not the accelerator clock, so they are
: > unaffected by oscillator frequency--a very convenient result.
: >
: > Also, the Zip Chip Utilities, and in particular the ZIP.SYSTEM program
: > that runs before any other system program on the boot volume, configures
: > the IIc+ just as it would for any slotted Apple II.  Of course, it is
: > necessary to leave slots 5 and 6 slow for disk access to work, and in
: > the IIc+ it does not appear to be possible to set the joystick to
: > "fast" (but the speaker can be set to fast).
: >
: > In short, just replacing the 16MHz oscillator with a 32MHz oscillator
: > converts a IIc+ into a "IIc++", and the Zip utilities can be used to
: > configure the actual speed, or even to default the accelerator to "off".
: >
: > BTW, I understand that some IIc+ machines will not run with a 32MHz
: > oscillator.  I have several 32MHz oscillators, and found that one type
: > would not work, while another (RXD 1100) did, so maybe the problem
: > some have reported is an oscillator problem, not a IIc+ problem...
: >
: > I tried a 39.750MHz oscillator, and it didn't work--but it was of the
: > same type that did not work at 32MHz, so I don't think that proves
: > anything.  I was hoping it would work, so that I could run at 32MHz
: > with some assurance of some "headroom" for reliability...
: >
: > -michael
: >
: > NadaNet file server for Apple II computers!
: > Home page:  http://members.aol.com/MJMahon/
: >
: > "The wastebasket is our most important design
: > tool--and it's seriously underused."
:
: I just got one of these last week. Can one add a HD somehow, too?
:
: I didn't get any utilities or any disks. Are these online
: (zip control I guess, if I understand your post)?

These utilities are now available on my website under
the 'DSK Images' folder, called "ZIP CHIP II.dsk".

ENJOY!!!

Or, you can use this handy link.  :o))))))

http://www.garberstreet.com/Apple2/DSK%20Images/ZIP%20CHIP%20II.dsk

William Garber
Email Address - willy46pa@garberstreet.com
Alt. Email - willy46pa@comcast.net
Web address - http://www.garberstreet.com