Bringing up a CPM

From: Dwight Elvey <elvey_at_hal.com>
Date: Thu May 27 16:25:02 1999

allisonp_at_world.std.com wrote:
> > I guess the issue is that the additional space is the BIOS and
> > since I'll be replacing this with my own BIOS, and I write efficient
> > code, I don't have to worry about it until I run out of space?
> > Dwight
> >
> ???HUH??? Figure this if your running a SSSD 8" to be compatable with
> media out there the system has two tracks to use for the CCP, BDOS and
> bios. Thats 52 sectors!
>
> The first sector DOES NOT HAVE TO BE THE BOOT.

Hi
 It does on my system unless I toggle in a loader or have
EPROMs to do it. I'd like to not have any EPROMs if I don't
need it. The controller automatically loads track 0 sector 1.
I start executing at address zero and it boot loads the
CPM system. The boot loader then jumps to the start of
the CPM and it over writes info at address zero with what
it requires there. As far as I know, I am following the examples
for a non-MDS800 type system and following exactly what is
shown on 6-14/6-15 of the CPM manual that I got from the
unofficial site. The mapping shows that the first sector
is a cold start loader and the CPM ( CCP ) part doesn't start until
the second sector.
 It would seem that there was additional BOIS info loaded that
didn't fit into the 51 sectors. It sounds like I can ignore
this because I'll be replacing it anyway.
 Let me say, no EPROM's, boots from disk.
Dwight
Received on Thu May 27 1999 - 16:25:02 BST