Interrupts: Difference between revisions
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Revision as of 17:30, 18 August 2017
Default Interrupt Handler
The default interrupt handler is at address $0038 in ROM and is automatically called by the Z80 in Interrupt Mode 1.
It:
- updates the system variable frame counter;
- scans the keyboard and updates the keyboard state system variables.
The default interrupt handler preserves all registers and has no external requirements.