IBM 770 manual System Overview, 2 Part 2 of 2. System Board Devices and Features

Device

Type

Features

Interrupt

controller

1

15

levels

of

system

interrupts

Keyboard/auxiliary

(interrupts

are

edge-triggered)

1

Internal

keyboard

device controller

TrackPoint

Auxiliary

device connector

Diskette

drive

Password

security

2

Supports:

controller

Ÿ

3.5-in.

diskette

(1.44

MB)

Ÿ

3.5-in.

diskette

(1.2

MB)

Ÿ

3.5-in.

diskette

(720

KB)

Serial controller

2

EIA-232-E

interface

(16550

compatible)

port

Programmable

as

serial

port

1,

2,

3,

or 4

Parallel

controller

One

9-pin,

D-sub

connector

1

Programmable

as

parallel

port

1,

2,

or

3

port

IEEE P1284-A compatible

Supports bidirectional input and output

Enhanced Parallel Port (EPP) compatible

Expansion

bus

Extended

Capabilities

Port

(ECP)

compatible

–

Supports

externally

attached

devices:

adapter (PCI-bus)

Ÿ

SelectaDock

docking

system

Ÿ

Port replicator

PCMCIA**

slots

–

Conforms

to

the

standards

for:

Ÿ

CardBus

Ÿ

Two

Type

I

or

II

PC

cards

ŸOne Type III PC card

Modem subsystem		–	Is	driven	by:
			Ÿ	MDSP 3780i
			Ÿ	SRAM 32 Kb by 40 bits
			Ÿ	Crystal Audio
			Ÿ	Voice band CODEC for modem
			Ÿ	Internal DAA
			Ÿ	Internal	omnidirectional	microphone
Infrared	subsystem	–	Supports:
			Ÿ ThinkPad IR/SIR/D-ASK (500 KHz) IR
Universal	serial bus	–	Supports:
(USB)			Ÿ	USB input and output		devices

Figure 1-2 (Part 2 of 2). System Board Devices and Features

1-4 System Overview