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

L
LF (Line Feed) 2-79
Light Pen
Interface 2-63
Mode Control and Status Register 2-57
Register Description 2-56
Line Control Register (LCR) 2-134
Line Feed 2-79
Line Status Register (LSR) 2-137
Lines Used 2-39
Loads 2-39
Logic Diagrams Appendix D
Low Memory Maps
BASIC and DOS Reserved Interrupts (80-3FF) 3-22
BASIC Workspace Variables 3-23
Interrupt Vectors (0-7F) 3-21
Reserved Memory Locations (400-5FF) 3-22
M
Major Component Definitions 2-48
Matrix Printer (IBM 80 CPS) 2-70
Megabyte 2-3
Memory
BIOS Map 3-7
Map (System) 2-25
Module Description 2-114
Module Pin Configuration 2-114
Other Read/Write Usage 3-6
Requirements (Color/Graphics) 2-60
Requirements (IBM Monochrome) 2-41
System Board Switch Settings 2-30
32/64 KB Expansion Option Switch settings 2-31
Memory Expansion Options
Memory Module Description 2-14
Memory Module Pin Configuration 2-114
Operating Characteristics 2-113
Switch Configurable Starting Address 2-115
MEMR (Memory Read Command) 2-11
MEMW (Memory Write Command) 2-11
MFM (Modified Frequency Modulation) 2-110
Mhz (Megahertz) 2-43
Microprocessor 2-3
1-11