Mail Archives: opendos/2001/02/15/21:54:05
As I recall, it was CP/M 2.2 (the last of the CP/M-80 8bit) was called
CP/M 2.2 56K. Yjay would mean that after CM/P is loaded, you have 56K to
work with. I would asume that included the CCP being loaded. It has been
a very long time since I worked with CP/M-80 and that was on my
PPLE ][ with a Z-80 card installed. Of course if your computer had less
than 64K then the memory available would be poportional. CP/M occupied
8K. I don't know if any CCPs were any larger. There were other related
OSes put out by DRI, such as MP/M which was a multiuser CP/M and some
others including DOS Plus which was basically CP/M-86 version 3.3 and
was the fore runner to DRDOS.
If you would like a copy of DOS Plus and your email can handle
attachments, I can send you a copy of it. I sent someone else on this
list a copy of it a few days ago. I had to disable my IDE hard drive in
CMOS to get it to load.
It may be able to read hard disks, but it would almost have to be either
FAT 12 (i.e. up to about 16MB) or the older 3.21 or earlier FDISKed
drive. Prior to DOS 3.3 (I should say MSDOS 3.3 and not one of the
various OEM versions that had larger drive capability like WYSE DOS
3.21) that had a maximum size of 32MB and one sector per cluster. I am
not certain if it can, but it seemed to try and read my IDE and that is
why it would not boot.
You may be able to create a partition like this with DRDOS using the /X
and specifing a cluster size of 512 bytes. I have not tried this, but
there are the partition codes there for using <32MB. This one probably
defaults to 512 byte sectors. You want the primary partition that is not
BIG DOS. I can run that from a DOS window here on NT and find which one
to use. That figures, I can't do it from NT. You could also select a FAT
12 partition. I didn't want to repartition my IDE to play with it After
I get that 4GB UW SCSI drive, I'll remove this IDE drive and install an
old Seagate ST-157A 40MB drive and disable it until working with these
old DOSes. DOS Plus will only read DOS 160K, 180K, 320K, 360K and CP/M
160K, 320K floppies.
The zipped file contains a program named FDCOPY. Use this to copy the
image to a 3-1/2" floppy and it will make it a Low density 5-1/4" floppy
as far as DOS plus or anything else that looks at it sees. You do not
even have to change your CMOS setting because DOS Plus does not even see
it. You can then format LD diskettes for either CP/M or DOS. You should
be able to run CP/M-86 programs with it. If you happen to have a 5-1/4"
drive, you can install that and read the CP/M floppies directly.
If you want to run CP/M-80 programs on the IBM, you will need to get a
CP/M-80 emulator I have a couple of them, but don't recall their names.
Some of the links on the DRDOS Web sites should lead you to CP/M sites
and one of them should lean you to one of these emulators. I'd bet that
Simtel has one and/or Oakland University. that URL is something like
www.oak.edu I don't recall it's exact URL, but that is close. I have it
on my Linux backed up stuff. You can do a search for DOS and find it.
They have one of the biggest collections I've seen anywhere.
Pat
----- Original Message -----
From: "da Silva, Joe" <Joe DOT daSilva AT emailmetering DOT com>
To: <opendos AT delorie DOT com>
Sent: Thursday, February 15, 2001 6:43 PM
Subject: CP/M Question
> I hope a question about DR-DOS' predecessor is not too
> "out of place" here ... ? <g>.
>
> Anyway, I have read information about CP/M 1.4 and
> 2.2 (or was that 2.0?) that said the command processor
> (CCP) occupies 2K of memory ...
>
> Now, my question is this : Were there any versions of
> CP/M (or CP/M clones), in which the command processor
> (CCP) was larger than 2K?
>
> BTW, the recent question about "total memory" is what
> has reminded me to ask about this, because, as far as
> I can tell, the only way to work out how much memory is
> available/free on a CP/M system, is to subtract the CCP
> size from the BDOS starting address ...
>
> Joe.
>
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