"Ctrl-c" (or "Ctrl-Break") in PC-DOS and MS-DOS interrupts and stops the
currently running program. In Windows software development it can also
be used to interrupt a running program at a predefined point for
debugging. Probably archaic though.
Chuck Norcutt
Piers Hemy wrote:
> At least one CP/M command also survived into MS/DOS.
>
> I recall a late 1980s misbehaving Toshiba plasma-screen laptop PC (high-end,
> it had an 80486 chip!) which seemed not to recognise that files had been
> copied between its A and B floppy drives (only one physical drive, swapping
> floppy disks in and out) - though another laptop would show them in the
> directory listing of the same floppies.
>
> Could it be that the hardware disk-change sensing switch was faulty? Because
> CP/M didn't have such a thing, you had to tell CP/M when you changed floppy
> disks, "Ctrl-c - change disk".
>
> To my amazement, the command still worked in MS-DOS, forcing the PC to
> re-read the directory. That was a very confusing moment, I can tell you.
>
> Piers
>
> -----Original Message-----
> From: Chuck Norcutt [mailto:chucknorcutt@xxxxxxxxxxxxxxxx]
> Sent: 19 December 2008 13:32
> To: Olympus Camera Discussion
> Subject: Re: [OM] While on the subject of computer safety and back-ups
>
> CP/M existed before IBM PC/DOS which existed before MS/DOS although the
> latter two are essentially the same. CP/M was also available for the IBM PC
> on the day of announcement but the cost was $250 vs about $60 for PC/DOS.
> Not hard to guess which one survived.
>
> Chuck Norcutt
>
> Chris Barker wrote:
>> It was CP/M, Frank; I had to search for it on the Web. It was a
>> command-line system with commands similar to MSDOS.
>>
>> Chris
>>
>> On 19 Dec 2008, at 10:28, Frank van Lindert wrote:
>>
>>> Dr DOS? Concurrent DOS? QDOS (Quick and Dirty DOS? 86-DOS?
>>>
>>> BTWQ, it might interest you that one of the first disk operating
>>> systems was mad by... Apple. At least according to this link
>>> http://members.fortunecity.com/pcmuseum/dos.htm , FWIW.
>>>
>>> Frank van Lindert
>>> Utrecht NL.
>>>
>>>
>>>
>>> Fri, 19 Dec 2008 09:46:47 +0000, Chris Barker <ftog@xxxxxxxxxxxxxx>
>>> wrote:
>>>
>>>> Winchester drives! It was a machine with a 20Mb Winchester on which
>>>> I learned about personal computing. It was connected (in 1986/7) to
>>>> a computer running an OS whose name now escapes me: a DOS but not PC
>>>> DOS or MSDOS.
> --
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