IM2

Hello, Andy!

Once, June 11, 98, Andy Harchenko wrote to Vova Hex,
on the topic: IM2 in TRDOS

AH> Did you build an interrupt vector plate? Without it,
AH> won't work at all.

On a working computer with a clean data bus, it will work without a sign.
And if you do do it, then so that the low and high bytes are equal.
For example, fill the table with address #6060, and at #6060 put JP where it should be.

AH> At the beginning of the IM2 processing procedure, you need to put DI, and at the end EI

When entering maskable or non-maskable interrupts, the processor _itself_ disables
maskable ones. And therefore, there is no need to issue the DI
command at the beginning of the interrupt handling procedure.

Regards, Evgeniy aka EVP-SOFT