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

Response Requirements, Interrupt and DMA 2-39
Reverse Video
Modes of Operation 2-40
Color Graphics Monitor Adapter 2-45
RF Modulator
Auxiliary Video Connector PI-4 Pin Berg Strip 2-63
Color Graphics Monitor Adapter 2-45
Interface 2-63
Ring Indicator 2-127
ROM
Character Generator 2-48
Color Graphics Mode 2-52
Color Graphics Monitor Adapter 2-46
Diagram 2-13
Hardware Overview 1-1
Keyboard 2-14
Memory Expansion Options 2-113
System Board 2-3, 2-4
System Board Component Diagram 2-13
System Memory Map 2-27
ROM and System Usage 3-1
ROM BIOS
BIOS Cassette Logic 3-8
BIOS Memory Map 3-8
Cassette Read 3-9
Cassette Write 3-9
Data Record Architecture 3-10
Description 3-2
Error Recovery 3-10
Interrupt 15 3-8
Interrupt ICH Timer Tick 3-5
Interrupt IDH Video Parameters 3-5
Interrupt IEH Diskette Parameters 3-5
Interrupt IFH Graphics Character Extensions 3-6
Interrupt Vector Listing 3-3
Other Read/Write Memory Usage 3-7
ROM BIOS Listing Appendix A
ROS (Read Only Storage) (See ROM)
ROM, Request for Master 2-92
RS232-C (See Asynchronous Communications Adapter)
RTS (Ready to Send) 2-123
R/W (Read/Write)
Symbol Description 2-95
2-123
1-17