Re: More fun with Freed Z80

[AppleCPM <a2@wilserv.com>]

Hi!

On Feb 21, 2:11 pm, Steven wrote:
> It's all simple economics.  I'm sure Alex would be glad to put up kits or
> assembled boards at 20Mhz, but they're going to be more expensive.
> FWIW, the upgrade is quite simple.  I just updated mine this morning (20Mhz.
> crystal, 2x22pf chip capacitors and a faster Z80).  Went quick and smooth and
> runs like the wind!
> The combination of the 20Mhz. Z80 card and my 12Mhz. ZipGSX equipped IIGS
> should be quite responsive when I get that up and running.
> FYI:  For those planning to upgrade memory to 512k, there is something odd
> going on with the ramdisk that causes BDOS errors while writing.  Alex is
> looking at it with a logic analyzer and I've been poring over the source code.
>   It's almost certainly a bug in the PCPI driver code, not the hardware.
> Since the original Applicard could not be expanded past 256k of banked memory,
> I'm betting that some code path in there was never exercised and has always
> been faulty.

    Arrrrrrggghhh!!!  My FedEx package with a 512K RAM chip, a 20 MHz
Z80 CPU and a 20 MHz crystal is, according to tracking data, now in
Barrington, NJ.  That's no more than 10 miles from here.  BUT, it
won't be delivered until Monday.  ARRRRGGGHHH...

Willi