Hello Glen,
 > Generally, the transfer will be suspended....
Ok, i think have an idea how does it work.
 > multitask? Simple... The processor does one task for a few
 > clocks
 > then switches to the next task, it does the next task for a
 > few clocks
 > and switches to the next... and so on....  Task priorities
 So, a pure multitasking OS like OS/2 isn't a real one (?). If all it does
 is switches from a task to another.
 Having 2 CPU in one motherboard is real a multitasking system?
 > Dos itself has a byte used to indicate that it's in use. It's
 > called the "indos flag". This is one byte that is examined by
 When just writing to the console(TSR clock), might this indos flag be 
checked?
 I've read somewhere about INT 21h/0C and above only might check for this
 flag.
 Print at console is INT 21h/09
 What is your thought?
Bye Glen!
---
---------------