2 ms·
The "poke56333,127" is disabling the background keyboard reading IRQ by disabling the "IRQ on timer out" function of the CIA 1 used to trigger it. This is need
by tenebrisalietum 7y ago
The "poke56333,127" is disabling the background keyboard reading IRQ by disabling the "IRQ on timer out" function of the CIA 1 used to trigger it.
This is needed because the "poke 1" that follows maps in the 4K character ROM over the I/O devices at D000-DFFF; if you don't do this the system would freeze.