02-10-2025, 10:32 AM
(01-10-2025, 08:08 PM)zhulien Wrote: can the new microbee run without interrupts? or does it have NMIs?
(01-10-2025, 08:08 PM)zhulien Wrote: can the new microbee run without interrupts? or does it have NMIs?
I should ask... can interrupts be disabled fully.
Interesting question.
NMI is not used at all. Normal INTn is used in some modes, depending on which version of the CP/M boot disk you use, and also when using the normal print functions for the parallel & serial ports.
If using a boot disk / software that scans the keyboard via the CRT controller, no interrupts are required, however, if using the 256TC compatible method, interrupts are used via the PIO to signal that
a new key scan code is available from the keyboard controller logic.
Why do you ask? What is the purpose of having disabled interrupts?