TW>> Teh First edition of DOS 3 only recognized 20 Meg Hard Drives. In those   
    TW>> days the 40 Meg Segate was popular and was divided into two 20 Meg   
    TW>> drives. Compaq with theri DOS 3.1 was factory modifies to recognice thye   
    TW>> 40 as one drive. I liked that as my First DOS computer, a Home Built XT   
    TW>> clone used a 30 Meg drive.   
      
    AZ> Not entirely accurate - early versions of DOS (PC DOS, MS   
    AZ> DOS, etc) through 3.2 allowed drive partitions up 32 MB...   
    AZ> so that 40 MB Seagate could have been partitioned into a 32   
    AZ> MB partition and an 8 MB one.   
      
    I do recall we had a PC at work that had Dos 3.x and we had to   
    upgrade the Dos so we could run a larger hard drive. That was   
    long ago and I don't recall the details.   
      
    AZ> It would be interesting to get a list of all the   
    AZ> limitations of RAM, hard drive, file size (etc) built into   
    AZ> various versions of DOS, Windows, Mac OS, etc. (Yes, even   
    AZ> the Mac - while it never had things like the 640 kb DOS   
    AZ> memory limitation - has had limitations).   
      
    One of the things I disliked about the PC was, it used the upper   
    memory for operating system Rom functions. The Z80 family put   
    the Rom at the low end of memory. So if the Z80 had been   
    expanded to 16 bits, which I believe it was later, it would not   
    have had a 640K limit. With the 8080 etc they had to jump around   
    that limit for expanded memory. Which is why it needed all the   
    extended/expanded memory nonsense.   
      
    ...   
      
      
      
   BOB KLAHN bob.klahn@sev.org   http://home.toltbbs.com/bobklahn   
      
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