Message-ID: <3A8C9CEA.AA16744C@pysmatic.net> Date: Thu, 15 Feb 2001 20:22:18 -0700 From: Neal X-Mailer: Mozilla 4.08 [en] (WinNT; I) MIME-Version: 1.0 To: opendos AT delorie DOT com Subject: Re: CP/M Question References: <01FD6EC775C6D4119CDF0090273F74A4021F61 AT emwatent02 DOT meters DOT com DOT au> <01c501c097c3$87c2c780$34822a40 AT dbcooper> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Reply-To: opendos AT delorie DOT com 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" > To: > 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 ... ? . > > > > 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. > > >