15
CHAPTER 3: Configuration
Table 3-3. Port to connector
Port #
Connector Location
Address
Example (Base=2E0)
1
1
Base+0
2E0-2E7
2
2
Base+8
2E8-2EF
3
3
Base+16
2F0-2F7
4
4
Base+24
2F8-2FF
3.2 Jumper Selections
For ease of configuration, the headers are grouped by port. Port 1 headers have a
“J1” prefix, Port 2 headers have the “J2” prefix, etc. For example, the header that
controls the Port 1 IRQ selection is J1B, the header that controls the Port 2 IRQ
selection is J2B. The silk-screen also provides information for configuring the
Adapter without the use of the manual. This is particularly useful in field re-
configuration.
3.3 IRQ Selection
Headers J1B through J4B select the interrupt request for each serial port. If COM1:
is selected, the corresponding jumper must be on the IRQ4 setting. If COM2: is
selected, the corresponding jumper must be on IRQ3. (This only applies to the
traditional DOS COM port assignments; in Windows
®
COM1: can use I/O address
300 and IRQ15 if it is available).
Figure 3-2. Headers J1B-J4B, IRQ selection.
3 4 5 6 7 9 10 11 12 15
