Re: A86: interrupts


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Re: A86: interrupts




> The shadow register (when in the interrupt) have the preserved regs in
> them.  If you exchange the registers in the user interrupt, you'll screw
> up the registers used where the int was called.  I was looking at the
> rom just now; it's beyond me why the registers have to be pushed and
> popped -- at the very most only hl register should be.

Now that I think of it, the demo program didn't push and pop when it
used the interrupt.  I think we've been needlessly slowing our calcs
down: 63 T-states 200 times a second.


References: