Difference between revisions of "83:Ports:04"
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| − | [[Category:83:Ports:By_Address|04 - Timer Interrupt Frequency]] [[Category: | + | [[Category:83:Ports:By_Address|04 - Timer Interrupt Frequency]] [[Category:83:Ports:By_Name|Timer Interrupt Frequency]] |
== Synopsis == | == Synopsis == | ||
'''Port Number:''' 04h | '''Port Number:''' 04h | ||
Revision as of 16:31, 1 April 2005
Synopsis
Port Number: 04h
Function: Timer Interrupt Frequency
This port controls the frequency of the hardware timer.
Read Values
This is a mirror of the link port.
Write Values
- Bit 0: Unknown. The calculator crashes when set. Maybe it has more or less the same behaviour as bit 0 of 83Plus:Ports:04.
- Bits 1 and 2 control the hardware timer frequency. Setting both 0 sets the timer to the fastest speed, and both 1 is the slowest speed. The normal speed is with both bits 1.
- Bit 3: Unused? Always 0.
- Bit 4: Unused? Always 1.
- Bit 5-7: Unknown, but definitely used.
