Re: Apple //c Questions

[hlevinsn@andromeda.rutgers.edu (Hank Levinson)]

jruschme@hiway1.exit109.com (John Ruschmeyer) writes:

>In article <33297bbd.1480891@167.152.149.11>,
>Edhel Iaur, Esq. <LOSETHECAPITALWORDSedhel@bigfoot.com> wrote:
>>On Mon, 10 Mar 1997 17:02:48 -0700, ddmacang@cats.ucsc.edu (Flying
>>Scot) wrote:
>>
>>>Does anyone know how much RAM the Apple //c could be upgraded with?
>>
>>AFAIK, 128K is standard, and 1MB can be added (If you have the newer
>>//c  models, this is cheap and easy.  If you have one of the older
>>models, you'll need the other kind of memory (which emulates Aux.
>>memory, not the super-cool "slinky" memory), like the MultiRAM C card,
>>or AE's Z-RAM cards.

>Is the Z-RAM the one that also includes a Z-80 processor? 

>I've seen references to a Z-RAM ULTRA, also. How does that differ?

>Thanks... <<<John>>>




There are three varieties of Z-RAM. The first allows memory expansion
to 512K. The second allows 1 Meg, and the third allows 1 Meg with CP/M
capability. All three models have a Z-80 chip on them. The purpose of
that chip on the first two models is to "refresh" D-RAM. It was
easier to use the chip rather than design a whole refresh circuit! But
the first two models do not support CP/M even though they contain the
Z-80 chip.