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

[John <zzzjoki@yahoo.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)?