Re: Failure speeding up ZipGS - advice wanted

["Michael J. Mahon" <mjmahon@aol.com>]

mmmann wrote:
> Hi Rich et al.. I appreciate the input.
>
> The oscillators I purchased are from JDR and look exactly like the old one. 
> They're the large oscillators with 4 pins. The FAQ mentions an OSC50.0 
> oscillator from JDR that got the author up to 10Mhz. I purchased an OSC40.0 
> and an OSC48.0 (they don't carry OSC50.0 any more) so it seems that I have 
> pretty much the same parts as that author.

The processor clock frequency is the oscillator frequency divided
by 4.  A 50MHz oscillator corresponds to a 12.5MHz processor clock.

> But the ILSI part number generator (mentioned in the original post) still 
> bothers me. When you use it it says that an HCOF-1 is a 1.8v part. Maybe the 
> part # generator doesn't work right?
>
> For the sake of completeness, here's the lettering on the old and the new 
> oscillators:
>
> ORIGINAL PART:    ILSI    HCOF-1    32.000Mhz    2292
>
> NEW 40Mhz ONE:    RASCO PLUS SE    40.000 MHZ    9016    SP98
>
> NEW 48Mhz ONE:    TOYOCOM    TC0-711THC    48.000Mhz    9137    JAPAN

FWIW, the labelling of the oscillator is not very important--there
are lots of manufacturers and all the 5v oscillators are essentially
interchangeable.  For example, all three oscillators mentioned above
are from different manufacturers.

Just make sure that you have a 5v oscillator and get it in the socket
properly.

Oscillators are very reliable unless subjected to severe overvoltages
or lots of G force.

-michael

Music synthesis for 8-bit Apple II's!
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