Re: MS-DOS 3.30 boot on the CBM-II

Nils Eilers has designed PETSD and PETSD+ that work on IEEE. He's also working on PETSD-DUO that will support both IEC and IEEE. Dave Stephenson sells PETSD+ on his site:
http://www.primrosebank.net/computers/pet/projects/pet_petsd_order.htm



Seve

      From: Michał Pleban <lists@michau.name>
 To: cbm-hackers@musoftware.de 
 Sent: Saturday, November 4, 2017 4:10 PM
 Subject: Re: MS-DOS 3.30 boot on the CBM-II
   
smf wrote:

> I actually think that a pure floppy disk based approach is a more
> compelling idea.
> 
> Just put this disk in and you can run MS-DOS 3.30
> 
> compared to:
> 
> Just open the case, pry out one of these chips and replace it while
> trying not to fry the board with static, then close it all up, put this
> disk in and pray and you can run MS-DOS 3.30.

I don't see why you can't have both ;-)

If you want to pry open the case (which you probably already have to do
to install the 8088 card anyway), you can do it and replace the card's
ROM. If not, no problem - the disk will contain the emulation layer
anyway, and it will be able to function without the ROM. When it detects
you have the ROM, it will use it, otherwise it will install itself into
memory.

Advantage of the ROM version - you don't risk it being overwritten by
any rogue software. Right now it sits at the top of memory and modifies
INT 12 to convince DOS that the computer has a little less RAM. But any
bad-behaving software can ignore INT 12 and overwrite the RAM.

> I'd have thought it would be quicker to keep with a disk based
> development as well, 

Of course, all development is disk-based and will stay that way. I want
to make the code ROMmable by a simple "%define" directive.

> I'm half expecting to see you build an IEEE hard
> drive or netboot eventually.

Is there something like SD2IEC for the IEEE bus? That would be quite
useful here.

Regards,
Michau.


      Message was sent through the cbm-hackers mailing list


   

       Message was sent through the cbm-hackers mailing list