Difference between revisions of "83:Ports:Mirrors"

Latest revision as of 03:14, 30 March 2005

General

When addressing the ports of the 83, only bits 0, 1, 2 and 4 make a difference, so every port has at least 15 mirrors by altering bits 3, 5, 6 or 7 (e. g. LCD status is available at port 38 as well). These variations are not listed below. All addresses are hexadecimal.

Input ports

• Link and pager: 00, 04
• Keyboard status: 01, 05
• Pager: 02, 06, 16
• Interrupt status: 03, 07, 17
• LCD status: 10, 12
• LCD data: 11, 13
• Battery and link status: 14
• Unknown: 15

Output ports

• Link and pager: 00
• Keyboard mask: 01
• Pager: 02
• Interrupt mask: 03
• Timer frequency: 04
• LCD command: 10, 12
• LCD data: 11, 13