mdj wrote:
> On Feb 16, 12:20 pm, Steven Hirsch  wrote:
> 
>>> Intersesting... What's the status of this? I've yet to put my board
>>> together, but I do prefer the idea of running it from ProDOS
>> I'm busy trying to piece together what I did to make that work.  It was done
>> as proof-of-concept for the CardZ180 project and never really polished up.
>> Instead of writing to the boot tracks of the disk, the setup
program created a
>> DRIVERS file and a relocated PCPICPM.SYS.  You copy them to a
ProDOS boot disk
>> (using a disk transfer utility to bootstrap yourself) and startup
from there.
>>   The PCPI 6502 BIOS basically runs as a ProDOS SYSTEM program and, once
>> running, can use the filesystem services to better support transfer between
>> CP/M and ProDOS.  I have a utility called pdosxfer that's use to move things
>> back and forth.
> 
> So the CP/M CBIOS is implemented in 6502, and on the Z80 side there's
> a "proxy" CBIOS that delegates this responsiblity back to the Apple II
> host ?

The Z80 BIOS is a bit more than a proxy, but that's essentially correct.

> I'd be interested in being able to use CP/M image files (hosted on a
> ProDOS volume) as the actual "disk", rather than a partition or other
> raw ProDOS device. This is similar to how I still run Apple Pascal -
> using a hacked version of the Pascal Profile Manager that Willi and I
> nutted out a few years back.

I think you'd find that quite slow.  The ALS/DRI 128k CP/M card used that 
approach and file I/O was glacial.  By allocating a contiguous partition you 
can operate at the block level and avoid a lot of overhead.

Steve
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