3-10
Chapter 3: Software Installation - Multiuser DOS
Echo
User's Manual, ver. 0.00
Figure 4:
Multiuser DOS: switch settings
Reserved - must be OFF
Base address sets:
Port 1 = address 280 hex
Port 2 = address 288 hex
Status port address
Status port is enabled (2C0 hex)
IRQ channel(s)
IRQ line for all ports is on channel A
SW1
Port 3 = address 290 hex
Port 4 = address 298 hex
Port 5 = address 2A0 hex
Port 6 = address 2A8 hex
Port 7 = address 2B0 hex
Port 8 = address 2B8 hex
Figure 5:
Multiuser DOS: IRQ settings
A
B
3
4
5
7
10
11
12
15
IRQ
J1
Note:
All Echo ports are interrupting on channel A, IRQ 10.
