IBM AT 5170 Technical Reference page 18

Display Switch ................................ 1-41
Variable Capacitor ............................ 1-41
Keyboard Controller ........................... 1-42
Keyboard Controller Initialization .............. 1-42
Receiving Data from the Keyboard ............. 1-43
Scan Code Translation ....................... 1-43
Sending Data to the Keyboard ................. 1-48
Inhibit ................................... 1-48
Keyboard Controller System Interface .......... 1-48
Status Register ............................. 1-49
Status-Register Bit Definition ................. 1-49
Output Buffer ............................. 1-50
Input Buffer ............................... 1-51
Commands (I/O Address Hex 64) ............. 1-51
I/O Ports ................................. 1-54
Real-Time Clock/CMOS RAM Information ........ 1-56
Real-Time Clock Information ................. 1-57
CMOS RAM Configuration Information ......... 1-59
1/
0 Operations ............................. 1-68
Specifications •.......•.•........•....•........•. 1-69
System Unit .................................. 1-69
Size ..................................... 1-69
Weight ................................... 1-69
Power Cables .............................. 1-69
Environment .............................. 1-69
Heat Output ............................... 1-70
Noise Level ............................... 1-70
Electrical ................................. 1- 70
Connectors .................................. 1-71
Logic Diagrams - Type 1 ........................ 1-7 6
Logic Diagrams - Type 2 ........................ 1-98
1-2
System Board