83Plus:Ports:8B

This port only exists on the the TI-84 Plus and the TI-84 Plus Silver Edition. On the standard TI-83 Plus, it acts as a shadow of port 0B. On the TI-83 Plus Silver Edition, this port has no effect.

Synopsis

Port Number: 8Bh

Function: USB Events Mask

This port is a mask for what errors port 86 will report.

Set the corresponding bits here to receive notifications via port 86.

Values

• Bit 0: Possibly set if the bus has been suspended (no activity for some length of time.)
• Bit 1: Unknown; probably related to HNP and/or SRP.
• Bit 2: Set if a bus reset has occurred (both D+ and D? pulled low for some length of time.)
• Bit 3: Unknown.
• Bit 4: Possibly set if a device has been connected (D+, or maybe D?, pulled high for some length of time.)
• Bit 5: This usually indicates that something was unplugged.
• Bit 6: Unknown; probably related to HNP.
• Bit 7: Calculator cannot provide sufficient power. Usually caused by low batteries, although, some devices cause this every time.