Re: CP/M & Contiki (from The Internet-enabled Contiki Desktop OS)

[steve@dosius.zzn.com (Dosius)]

Yves McDonald <""yves.mcdonald\"@NO SPAM sympatico.ca> wrote in message news:<Bb2da.242$K37.53468@news20.bellglobal.com>...
> Dosius wrote:
> > Yves McDonald <""yves.mcdonald\"@NO SPAM sympatico.ca> wrote in message news:<JUrca.8479$VT.947854@news20.bellglobal.com>...
>  
> >>I studied how the Z80 softcard works many years ago and I think the 6502 
> >>was halted while the Z80 was working.  The Apple' 6502 would 'wake up' 
> >>to perform I/O and for short periods of time to refresh its  registers 
> >>which were built like dynamic RAM (needs refresh or it loses addresses 
> >>for program counter and stack pointer!)  In short, it was one processor 
> >>at a time, plus they shared the same RAM.
> > 
> > 
> > Yes.  I tried to emulate one of these.
> > 
> > 
> >>The memory map for the Z80 was all mixed up compared to the 6502 map to 
> >>re-create the memory map of a CP/M system.
> > 
> > 
> > Really freaky. ;)  It was like 0000H->$1000, B000H->$D000,
> > E000H->$C000, F000H->$0000 or something like that.
> > 
> > 
> >>CP/M wasn't offering much service: serial and disk I/O (through BDOS) 
> >>and a return-to-OS system call.  Since CP/M offers I/O, I guess it 
> >>wouldn't be too difficult to make Contiki use them.
> >>
>  
> >>Bringing CP/M to the Internet age: what a mad concept!   Just like 
> >>riding a donkey on the freeway :).
> >>
> > 
> > Hey, I'd like to do some CP/M-86 hacking...I'm working on some
> > cross-compile hacks with Turbo C++ 1.01.  Ideas?  :D
> 
> Unfortunately not :(.  I programmed for CP/M with K&R C then switched to 
>   various versions of Microsoft/ANSI C to do system programming under 
> MS-DOS, and so on with Windows, etc.

Well, it's ANSI C (not K&R), just without the library...

> 
> Do you have an Apple 2 and a PC Transporter?  That would be a nice 
> target platform!
> 

I wish ;) I do have a //e though.

> The idea of bringing Apple/CPM to the Internet keeps spinning in my 
> head.  I think I'll try it, basically as an exercise in OS and network 
> programming.  How about adding file support and a bare-bone FTP client? 
>   The Z80 has a nice architecture and so did CPM, with clean system call 
> interface bouns.  There's a 80 column display support too which is quite 
> convenient for a text-based interface.  I have to do an evaluation of 
> the whole idea.

:)

I'd like to combine the Z80 and a 3MB RAM Works.

-uso.