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- Path: sparky!uunet!wupost!waikato.ac.nz!aukuni.ac.nz!kcbbs!kc
- Newsgroups: comp.os.cpm
- Subject: Re: CP/M operating sys for intel machine
- Message-ID: <43354.2129210810@kcbbs.gen.nz>
- From: Richard_Plinston@kcbbs.gen.nz (Richard Plinston)
- Date: 31 Jul 92 12:02:34 GMT
- References: <ERU.92Jul27171440@tnso04.tele.nokia.fi>
- Organization: Kappa Crucis Unix BBS, Auckland, New Zealand
- Lines: 37
-
- >>> I believe that CP/M-86 evolved into the MS-DOS compatible DR-DOS
-
- CP?M-86 went many ways. CP/M-86 for IBM-PC (pre-XT) was released
- about March 82, it was upgraded mid-83 to support XT with hard
- discs. Early MS-DOS also did not support hard drives. It was
- replaced as a product by Concurrent-CP/M-86 in mid 83. This allowed
- multi-tasking by having 4 'virtual screens' thus 4 tasks could run
- simultaneously.
-
- CCP/M developed to include the ability to run MS-DOS programs as
- Concurrent-PC-DOS (3.2) in Sept 84. This system was also multi-user
- (as well as multi-tasking) allowing terminals to be attached to a
- multi-port card.
-
- It has developed through CDOS, CDOS-386, to now being DR-MultiUser-DOS
- 5.1. DR-MDOS still retains CP/M-86 and MP/M-86 compatability in
- its 'native mode' API.
-
- DR-DOS was originally built from the CDOS source code by removing the
- multi-user, multi-tasking and CP/M-86 compatability parts to produce
- DR-DOS 3.41. I understand that DR-DOS 6.0 and DR-MDOS 5.1 still have
- some common source code.
-
- There were other DR 'replacements' for CP/M-86. DOS+ in the mid-80s
- was a MS-DOS 2.x clone that also ran CP/M-86 programs and had limited
- multi-tasking abilities. It was bundled with Amstrad 1512 and 1640
- machines - though MS-DOS was also included. It also came with the
- ACORN 80188 co-processor for the BBC Master 128/512 (for students of
- the esoteric the BBC Master 128 was a 6502 based 128Kbyte machine,
- the co-pro was just a 80188, 512Kb of memory, couple of ROMs that
- plugged into the 'tube' to give MS-DOS compatability - I still have
- one).
-
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