Microsoft open sources GWBASIC

geneb geneb at
Thu May 28 14:37:36 CDT 2020

On Thu, 28 May 2020, Liam Proven via cctalk wrote:

> On Thu, 28 May 2020 at 21:11, geneb <geneb at> wrote:
>> CP/M was huge in the US, especially among the S-100 system users.  It was
>> a pretty narrow window though - from probably 1978-1982.  Kaypro had a
>> good portion of the market as well, but like pretty much all the other
>> manufacturers of CP/M machines, the IBM PC compatible juggernaut beat them
>> cold before they fully understood the fight.  I'm not aware of any CP/M
>> machine manufacturer that was able to successfully transition to the PC
>> compatible market.  Some (like Kaypro) tried with offerings like the
>> Kaypro 16 and Kaypro 2000, but I suspect at that point it was too little,
>> too late.  They simply couldn't compete with the uber cheap hardware
>> coming in from overseas.
> The $64K question is, of course, how big that market was.
For businesses, I expect it was pretty large.  CP/M was never really aimed 
at home users.  There were also things like TurboDOS and MP/M-II that were 
basically multi-user CP/M systems.  Two or more Z-80 SBCs in an S-100 bus 
with serial terminals.  They shared disk (hard & floppy) resources.


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