Apple Lisa - Page 60

I
Confidential
Clock
CMOS
COPS
CPU
CVSD
Cycle
Daisy
chain
Decode
DMA
DOS 3.3
D/A
ECC
Event
FIFO
Flip flop
Lisa Hardware Reference Manual
A continuous, regular waveform used to control the
timing of logic decisions.
7-Jul-81
Complementary Metal Oxide Semiconductor. CMOS combines
N-channel and
P-channel MOS transistors to give rather
high speed operation, good noise rejection, low power
consumption, and
large fan-out. Since the non-volatile
parameter memory must not consume much power, it is
implemented with CMOS chips.
Control Oriented Processor System
Central Processing Unit. A Motorola 68000 in the Lisa.
Continuously Variable Slope Delta Modulator. A kind of
analog to digital and ~gital to analog converter.
The interval between two clock pulses.
A daisy chain is a method of connecting several devices
to a single I/O port.
The opposite of a select. The decoder's input address
determines Which of its many outputs will go low.
Direct Memory Access. Normal memory access goes through
the 68000 and its memory manager. A device can, however,
read and write memory locations directly, without any
intervention from the CPU.
Disk Operating System 3.3, used on the Apple II. The
floppy disk controller used by the Lisa is very similar
to that supported by DOS.
Digital to Analog. When a digital signal is used to
control an analog device, the bits in the digital word
must
be converted into analog voltage levels.
Error Correction Code.
A
block of data associated with an exception.
First In First Out~ A queue.
A digital circuit used to store one bit of data.
Page 60