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. --Chuck