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List of Abbreviations
A
Ampere
ISR
Read Inservice Register
ALE
Address Latch Enable
KB
Kilobyte
APC
Advanced Personal
LED
Light Emitting Diode
Computer
LSB
Least Significant Bit
APU
Arithmetic Processing Unit
LSI
Large-Scale Integration
AT
Abnormal Termination
MB
Megabyte
BBM
Battery-Backed Memory
MFM
Modified Frequency
CMOS
Complementary Metal
Modulation
Oxide Semiconductor
MHz
Megahertz
CPU
Central Processing Unit
MOS
Metal Oxide
CRT
Cathode Ray Tube
Semicond uctor
CS
Code Segment
ms
Millisecond
DCH
Device Control
MSB
Most Significant Bit
DIP
Dual In-line Package
ns
Nanosecond
DMA
Direct Memory Access
NT
Normal Termination
DMC
Direct Memory Access
OCW
Operational Command
Cycle
Word
OS
Data Segment
ODA
Output Device Adapter
EPROM Erasable Programmable
PAL
Programmable Array
Read-Only Memory
Logic
ES
Extra Segment
PCB
Printed Circuit Board
FDC
Flexible Disk Drive
POF
Power Off Control
Controller
RAM
Random Access Memory
FDD
Flexible Disk Drive
ROM
Read-Only Memory
FIFO
First-In First-Out
rpm
Revolutions Per Minute
FM
Frequency Modulation
SS
Stack Segment
GDC
Graphic Display Controller
SW
Switch
HEX
Hexadecimal
TTL
Transistor/Transistor
Hz
Hertz
Logic
IC
Integrated Circuit,
USART Universal Synchronous/
Interrupt Code, Invalid
Asynchronous Receiver/
Command
Transmitter
ICW
Initialization Command
V
Volt
Word
VFO
Variable Frequency
I/O
Input/Output
Oscillator
IP
Instruction Pointer
W
Watt
IRR
Read Interrupt Register
JlS
Microsecond
xiv
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