User manual

3-38 Chapter 3: Software Installation - Windows NT
Echo User's Manual, ver. 0.00
Figure 16: Windows NT: switch settings
When ON
,
p
ort 1 is COM1
(
3F8 hex
)
When ON, port 2 is COM2 (2F8 hex)
Reserved - must be OFF
Base address sets:
Port 1 = address 280 hex
Port 2 = address 288 hex
Status port address
When OFF, status port is disabled
IRQ channel(s)
All ports will interrupt 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
2. Choose an IRQ for your Echo. It is possible to have the even
ports on one IRQ and the odd ports on a different IRQ, but
we recommend having all ports on one IRQ. Good choices of
IRQ's are 5, 10, 11, 12 and 15. The two serial ports that
come with your system usually use IRQ 4, 3 and LPT1 is
usually IRQ 7. Please refer to the Table showing typical IRQ
usage in Chapter 2: Hardware Installation. For our
example we will choose IRQ 10. Figure 17 shows the
example IRQ setting. Please refer to Figures 2, or 3 in
Chapter 1: Introduction for the location of the jumper block
J1.