Ibm s-100 system?

Chuck Guzis cclist at
Sat Apr 23 19:37:44 CDT 2016

On 04/23/2016 05:09 PM, Fred Cisin wrote:

> After Microsoft upgraded PC-DOS from 1.00 to 1.10, they then
> provided computer OEMs with a similar product numbered 1.25 OEMs were
> expected to make their own personalized and customized IO.SYS, 
> MODE.COM (could also do stuff such as switching between 
> internal/external monitor, etc.), etc. OEMs did not even need to call
> it "MS-DOS"  (Zenith Z-DOS)

I have a recollection that Bill had a problem with licensing terms for
DOS--something about a minimum license fee for OEMs.  They cooked up a
way to take a copy of PC DOS 1.1 and replace the IBMBIO.SYS component
and get the thing to work on a 85/88 system.


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