2-6
Chapter 2: Hardware Installation
Echo
User's Manual, ver. 0.00
Many other devices such as the keyboard and disk drives also
require an IRQ.
Table 3
shows some typical IRQ assignments.
Table 3:
Typical IRQ assignments
IRQ
Device
0 Timer
output
1 Keyboard
2 Reserved
3
COM2, COM4, SDLC
4
COM1, COM3, SDLC
5 Unassigned
(typically)
6 Floppy
disk
controller
7 LPT1
8 Real-time
clock
9 Reserved
10 Unassigned
(typically)
11 Unassigned
(typically)
12 Unassigned
(typically)
13 Co-processor
14
Primary fixed disk controller
15
Secondary fixed disk controller
In most cases the default IRQ setting for your Echo adapter is
satisfactory. If an IRQ conflict exists between the Echo adapter
and another expansion device, you must choose another IRQ. To
select an IRQ simply install the jumper across the corresponding
pins for that IRQ on J1.
