IBM 5150 PC Technical Reference (6025005, August, 1981) (PDF)

Asynchronous Communications Adapter
Block Diagram 2-124
Current Loop Interface 2-127
Input/Output Decode 2-125
Input/Output Signals 2-133
Input Signals 2-129
Interface Description 2-126
Interface Specifications 2-147
Interrupt 2-126
Interrupt Enable Register 2-141
Interrupt Identification Register 2-139
INS 8250 Accessible Registers 2-134
INS 8250 Functional Pin Description 2-129
INS 8250 Line Control Register 2-134
INS 8250 Programmable Baud Rate Generator 2-135
Line Status Register 2-137
Logic Diagram D-48
Modem Control Register 2-142
Modem Status Register 2-143
Modes of Operation 2-125
Output Signals 2-132
Programming Considerations 2-133
Receiver Buffer Register 2-144
Reset Functions 2-133
Selecting the Interface Format 2-146
Transmitter Holding Register 2-145
B
BASIC (Beginner's all-purpose symbolic instruction code)
80 Interpreter 1-1
Reserved Interrupts 3-23
Screen Editor Special Functions 3-19
Workspace Variables 3-23
Baud (See ,INS 8250 Programmable Baud Rate Generator) 2-132
Baud Out (BAUDOUT) 2-132
BEL (Bell) 2-82
Bell (BEL) 2-82
Berg Pin Connectors 2-63
BIOS
(Basic Input Output System) 3-2
Cassette Logic 3-8
Memory Map 3-7
Interrupt Vector Listing 3-3
Parameter Passing 3-2
1-2