Section 4. Keyboard - IBM 5170 Technical Reference

SECTION 4. KEYBOARD
Contents
Description ...................................... 4-3
Interface ..................................... 4-3
Sequencing Key Code Scanning ................... 4-3
Keyboard Buffer ............................... 4-3
Keys ........................................ 4-3
Functions Performed at Power-On Time ..........•..... 4-4
Power-On Reset ............................... 4-4
Basic Assurance Test ............................ 4-4
Commands from the System .......•••................ 4-5
Reset (Hex FF) ............................. 4-5
Resend (Hex FE) ............................ 4-6
No-Operation (NOP) (Hex FD through F7) ....... 4-6
Set Default (Hex F6) ......................... 4-6
Default Disable (Hex F5) ..................... 4-6
Enable (Hex F4) ............................ 4-6
Set Typematic Rate/Delay (Hex F3) ............ 4-7
No-Operation (NOP) (Hex F2 through EF) ....... 4-8
Echo (Hex EE) ............................. 4-8
Set/Reset Mode Indicators (Hex ED) ............ 4-8
Keyboard Outputs ......•......................... 4-10
Key Scan Codes .............................. 4-10
Command Codes to the System ......••.........•.... 4-12
Resend (Hex FE) ........................... 4-12
ACK (Hex FA) ............................ 4-12
Overrun (Hex 00) .......................... 4-13
Diagnostic Failure (Hex FD) .................. 4-13
~ Break Code Prefix (Hex FO) .................. 4-13
BAT Completion Code (Hex AA) .............. 4-13
ECHO Response (Hex EE) ................... 4-13
Keyboard 4-1