-> MSGID: 1:3634/12{at}fidonet 4e4a94d6
-> REPLY: 1:120/281{at}fidonet 364f1a20
-> PID: FDEDIT/w+ 1.b7.2 BM00017
-> CHRS: IBMPC 2
-> CODEPAGE: 437
-> TZUTC: -0500
-> TID: FastEcho 1.46.1 7617
->  CA> If there are PC OS that can 'stop' ASM programs from toggling
->  CA> PIAs - which ones are these?
-> 
-> OS/2 is the first one that comes to mind...
-> 
->  CA> If the ASM is allowed to
->  CA> execute how (other than in hardware) can the OS intercept the
->  CA> execution of ML instruction code?  Interrupt tables can be
->  CA> re-written from within ASM?  Interesting!
-> 
-> the OS checks what each program is doing before allowing it to do it... WRT
-> interrupt tables being written in ASM, that's where we started with these
-> things oh so many years ago... i used to do things of similar nature with the
-> peeks and pokes of BASIC but that was before i discovered ASM and PASCAL OB-)
-> 
This is because each ASM program is executing in a virtual machine
so the PIA it thinks it is toggling is not the PIA at all, just a
memory location - is this what you mean?

Charles Angelich
angelich{at}hotmail.co
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