Tandy 102 Service Manual page 6

FIGURE
DESCRIPTION
NUMBER
NUM
PAGE
BER
.................................. C-6 Pin Configuration of 81 C55 .................................................................. C-7
C-7 Internal Register of 81 C55 ..................................................................................................... C-9
C-8 Programming the Command/Status Register ...................................................................... C-10
C-9 Reading the C/S Register ....................................................................................................... C-11
C-10 Bit Assignments to the Timer Counter .................................................................................. C-11
C-11 Functional Block Diagram ...................................................................................................... C-13
C-12 Pin Configuration of 6402 ....................................................................................................... C-13
C-,13 Receiver Timing ..................................................................................................................... C-16
C-14 Transmitter Operation ............................................................................................................ C-17
C-15 Start Bit Detection Timing ...................................................................................................... C-18
C-16 Construction of LCD Panel .................................................................................................... C-19
C-17 Operation Theory of LCD Panel ............................................................................................. C-20
List of Tables
TABLE
NUMBER
DESCRIPTION
NUM
PAGE
BER
4-1 I/O MAP ................................................................................................................................... 4-5
4-2 Port Address of PIO ................................................................................................................ 4-5
4-3 System Bus Pin Assignments ................................................................................................ 4-11
B-1 System Bus Connector Pin Assignments ............................................................................. B-2
B-2 RS-233C Connector Pin Assignments .................................................................................. B-3
B-3 Printer Connector Pin Assignments ...................................................................................... B-4
C-1 Interrupt Priority, Restart Address and Sensitivity ............................................................... C-4
C-2 80C85A Machine Cycle Chart ............................................................................................... C-6
C-3 80C85A Machine State Chart ................................................................................................ C-6
C-4 I/O Address of 81 C55 ............................................................................................................. C-9
C-5 Port Control Assignment ........................................................................................................ C-10
C-6 Control Word Format .............................................................................................................. C-15
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