On Jul 09, 1994 Paul Edwards wrote in a message to Rod Speed:

PE> Ah yes, there's my next shortcut.  Being a stickler for
PE> standards, I'm only planning on implementing the documented
PE> ones.  Last night I counted the ones in one of the books
PE> David Begley gave me, and there is 100 MSDOS interrupts, and
PE> probably the equivalent in BIOS.  I will be writing
PE> INTERFACES to the BIOS ones, and REPLACING the MSDOS ones.
PE> I will be implementing them according to what this book says
PE> they are.

Then you will find that many apps won't run. Check out Andrew Schulman's
"Undocumented DOS" book. For example he writes about TSRs -
"The documented facilities are insufficient for writing TSRs that,
once resident, make INT 21h DOS calls. .... it is well known in the PC
programming community that one must use undocumented DOS in order to
properly write the vast majority of TSRs". Companies like Digital
Research spend millions on producing a "compatible DOS" product
and they still have problems with apps that don't function quite as they
should. Do you really think you could do better?

mgm

--- timEd 1.00+




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