Re: Microsoft Premium Softcard //e doesn't fit in my Apple //e!

[jhn.clnc@googlemail.com]

On Monday, February 25, 2013 1:39:10 AM UTC, Alex Freed wrote:
> On 2/24/2013 2:47 PM, Steven Hirsch wrote:
> 
> >
> 
> > I think "Z80B" is pertinent to the first generation (1980s) parts only.
> 
> > That Z84 part number is the one I have in my board.
> 
> >
> 
> 
> 
> The original Z80 was rated 2.5 MHz. Z80A - 4 MHz and Z80B - 6 MHz.
> 
> Then it was second, third, etc. sourced by quite a few companies rated 
> 
> for different speeds. The most advanced parts are Z84C00xx, where "C" 
> 
> means that they are CMOS and xx indicates the speed.
> 
> 
> 
> Using a 20 MHz CPU with a real PCPI board won't do much good as the DRAM 
> 
> only works fast enough for a 6 MHz clock. My version uses pretty fast 
> 
> (55 ns) static RAM that is happy to run at 20 MHz clock all day.
> 
> 
> 
> I didn't see 20 raised hands but ordered a few more PCBs. The interested 
> 
> parties will get a kit with a PCB and all the parts including programmed 
> 
> CPLD and PROM.
> 
> 
> 
> -Alex.

I would like one too, if there are any left. What's the paypal account?

-Justin.