>A point in the right direction and a little experimentation. What else would
>one expect for an Apple II hardware card circa 1988? :) Thanks!
Hello. Well, the design may have been circa 1988, but different Zip
cards have different processors, it seems. What is the speed of
your Zip GS? Any Zip GS can be easily sped of by adding a new
65C816 chip rated at 14Mhz (or 20Mhz) from WDC (or CMD) and
a new oscillator to clock the chip, but some Zip GS units come with
processors that can be easily overclocked by just changing the
Wayne Stewart pointed out that he sped up his Zip GS to super
fast speeds by overclocking his 8Mhz CPU. 8Mhz is significant
because WDC now makes two CPUs of the new design, an
8Mhz one and a 14Mhz one. Interesting thing is that the 8Mhz
version can usually be overclocked. The design of the new chip
is very good, much better than the older ones.
To see if you have the good chip, read the printing on the CPU.
If it is WDC65C816PL-xx (where XX is the Mhz) you have the older
design and are unlikely to overclock it much. May be possible to
overclock a Mhz or two, but not like the new design. The new
design is identified with an extra S in the name.
WDC65C816SPL-xx where xx is the Mhz rating (either 8 or 14).
S stands for Sanyo which WDC commisioned to redesign the
If you have a Sanyo chip, go ahead and put in a faster oscillator
to pump up the speed. You could very likely get the full 15Mhz
with the 8Mhz rated chip as long as it is of the new (Sanyo re-)