8 Aug
2006
8 Aug
'06
4:38 p.m.
Don wrote:
Alternate registers are useful for interrupt handlers
-- *if*
you ensure that they can't be nested. You can cheat and
use AF in one IRQ and the other pairs (EXX) in another IRQ
(of course, assuming you only need AF in the one and don't
need A or F in the other! :> )
Well one use could be a dedicated controler --
IO ports,
ROM,CPU and OSC. The alternate set would provide the ram.