Hi All,

Recently I said that I had nearly completed the disassembly of the
Xtal Dos CCP (Console Command Processor), the bit that does the
command line procesing, and that I had started on the BDOS portion
and that I hoped to complete this by the Autumn.
Well I'm pleased to say that the BDOS disassembly is nearly finished
too! The reason is that it occured to me to compare Xtal Dos to the
source code for CP/M 2.2. I have a copy of this. It was never
optimised for Z80, merely copied from the 8080 intsruction set which
is a subset of Z80 machine code.
Guess what! The Xtal Dos code is about 85% identical to CP/M 2.2.
Apart from raising an interesting historical question (did Xtal
license CP/M code from Digital Research or did they reverse engineer
it?), it means that it's saved me a huge amount of work. So the
chances are the now the whole thing will be posted sooner than later.
Having said this I have decided to rework some of the CCP disassembly
so that the labels conform more closely to those of CP/M 2.2 - this
should help anyone else who wants to compate the two OS's. Since I did
the CCP entirely from my own head the labels are different at the
moment. So I won't now be releasing the CCP until this is done. The
entire piece of work is going to be in excess of 100 documented pages
with a detailed commentary on every routine, so it's still a
substantial chunk of work to get through, please be patient :)

I apologise for not posting the forumn more frequntly and being slow
to answer any postings, I don't actually have a phone or an internet
connection so I have to venture to civilisation once in awhile to
post. Also my laptop is broken at the moment. Soon I'll be moving
closer to other beings and the joys of modern technology will once
more be available to me - can't wait :)