DOS 4x extended the lifespan of DOS 3.3 to the introduction of DOS 5.  

> -----Original Message-----
> From: Chuck Lewis [mailto:clewis@iquest.net]
> Sent: Friday, November 12, 1999 3:54 AM
> To: MIDRANGE-L@midrange.com
> Subject: Re: Bill Gate$.
> 
> 
> You are right Eric, that is where the split happened. I 
> remember CLEARLY - DOS 4.0
> being a NIGHTMARE and 4.1 being MUCH more stable. Depending 
> on whether a PC had
> MS-DOS or PC-DOS you could use the FULL SCREEN editor or get 
> stuck with EDLIN...
> 
> And as far as "where the ORIGINAL DOS came from, it is a CP/M "port" !
> 
> Chuck
> 
> 
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