Mail Archives: opendos/2001/02/15/22:15:12
http://cpm.port5.com/
Patrick Moran wrote:
>
> 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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