Hi Bush and Al Gore,

I'm totally confused about your discussion.
What's the "EA command" ?
Mean you the EA bit ?
There is no influence of it to the current interrupt handler.

Its often asked, why no further interrupt was executed after a software reset "LJMP 0000h".
The reason was always, the CPU is still thinking to be already inside an interrupt.
And the solution is always to execute a RETI 2 times. If no interrupt in progress, it acts similiar the RET instruction, otherwise it resets the internal interrupt logic.

So, if you want to return from a high level interrupt to main without return to the low level interrupt, you must always do RETI 2 times instead of only 1. Otherwise in future all low level interrupts disabled.

This must be true, because a lot of questions about this on this forum. And they all only solved in the described manner.


Peter