IBM Personal System/2 65 SX User Manual

Device
Type
Features
Microprocessor
-—-
80386SX"*
24-bit
address
and
16-bit
data
interface
System
Timers
1
Channel
0
—
System
timer
Channel
2
—
Tone
generation
for
speaker
Channel
3
— Watchdog
timer
ROM
Subsystem
_
128KB
(KB
=
1024
bytes)
RAM
Subsystem
_
1
to
8MB
(MB
=
1,048,576
bytes)
Expandable
on
the
channel
CMOS
RAM
_
64-byte
CMOS
RAM
with
Subsystem
real-time
clock/calendar
2KB
CMOS
RAM
extension
Battery
backup
Video
Subsystem
1
Auxiliary
connector
on
the
channel!
Analog
output
256KB
video
memory
Audio
Subsystem
1
Driven
by:
- System-timer
channel
2
- The
‘audio
sum
node’
signal
DMA
Controller
1
Eight
independent
DMA
channets
Single
or
burst
transfers
and
read
verification
Interrupt
Controller
1
16
levels
of
system
interrupts
Interrupts
are
level-sensitive
Keyboard/Auxiliary
1
Keyboard
connector
Device
Controiter
Auxiliary-device
connector
Password
security
Diskette-Drive
1
Supports:
Controller
-
1.44MB
formatted-diskette
density
- 720KB
formatted-diskette
density
Serial
Controlier
2
RS-232C
interface
Paraile! Controller
Micro Channel
Math Coprocessor
Socket
Programmable as serial port 1 or 2
FIFO mode* and character mode
Programmable as parallel port 1, 2, or 3
Supports bidirectional input and output
Eight
channel
connectors
for
Type
3
adpaters:
~ Seven 16-bit connectors
- One 16-bit connector with an
auxiliary-video extension
Supports
80387SX""
math-coprocessor
option
Same
clock
speed
as
the
system
microprocessor
*
The
Model
65
SX
supports
FIFO
through
ABIOS
calls
only.
Figure
1-1.
System-Board
Devices
and
Features
Additional
memory
can
be
added
in
any
available
Micro
Channel
connector;
however,
the
total
amount
of
memory
installed
must
not
exceed
the
16MB
addressing
limit.
*
80386SX
and
80387SX
are
trademarks
of
the
Intel
Corporation.
1-4
Model
65
System
Overview
—
October
1990

IBM Personal System/2 65 SX Specifications

General

Brand	IBM
Model	Personal System/2 65 SX
Category	Desktop
Language	English