IBM did all the hardware design, some of it based on which Intel parts
IBM considered reliable. IBM had prior design experience using the 8085
and 8-bit support chips. Intel's 16-bit support chips were brand new
and an unknown reliability risk. That's the primary reason the 8088 was
used instead of the 8086. Microsoft did PC-DOS (based on Seattle
Computer's 86-DOS and a lot of help from IBM in fixing it). MS-DOS came
later along with the PC clones.
Chuck Norcutt (who was there)
On 4/9/2016 11:44 AM, Larry Griffin via olympus wrote:
I'm not sure if it was IBM that devised the memory map or Microsoft. The
memory map divides 1 meg into sections the first that we know as
motherboard/system memory 640k. The additional 384k was divided up on
the 8bit BUS.
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