Adress $DC0E, enligt Mapping C64:
Bit 5. Bit 5 is used to control just what it is Timer A is counting.
If this bit is set to 1, it counts the microprocessor machine cycles
(which occur at the rate of 1,022,730 cycles per second). If the bit
is set to 0, the timer counts pulses on the CNT line, which is
connected to pin 4 of the User Port.
Enligt https://www.c64-wiki.com/wiki/CIA:
Bit 5: 0 = Timer counts system cycles, 1 = Timer counts positive slope at CNT-pin
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