83Plus:Ports:2F

This port only exists as a distinct port on the TI-83 Plus Silver Edition, the TI-84 Plus, and the TI-84 Plus Silver Edition. On the standard TI-83 Plus, it acts as a shadow of port 07.

Synopsis

Port Number: 2Fh

Function: LCD Wait Delay

After every write to the LCD bit 1 of port 2 resets for a certain amount of time. This port controls that amount time.

Read Values

• This port reads the last vaule written to it.

Write Values

• Bits 0 and 1 control the amount time, the following values tell by how much.
  • 0 = ~3.5 microseconds
  • 1 = ~8 microseconds
  • 2 = ~10.5 microseconds
  • 3 = ~15 microseconds

• Bits 2-7: The function of these bits are unknown.

Comments

NOTE: The timings above are ROUGHLY estimated.

This value really shouldn't be changed. TI-OS depends on this being set high enough to function for the LCD delay.

Also the 83+SE has this port set to 4A as defualt, the 84+(SE) has this port set to 4B as defualt.

Credits and Contributions

• James Montelongo