Compaq Portable 386 Compaq Portable 386 Personal Computer Maintenance and Serv - Page 149
Table 9-2. Jumpers E3, E4, E8, and E9 - Select Serial Communications, E7, Pins 1 and 2
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E7, Pins 1 and 2 Select primary interrupt (IRQ7) (default) E7, Pins 2 and 3 Select alternate interrupt (IRQ5) Table 9-2. Jumpers E3, E4, E8, and E9 - Select Serial Communications Interface Options Jumper Setting Function E3, Pins 2 and 3 Select serial interface as COM1 (3FX, IRQ4), and modem E4, Pins 1 and 2 or second serial interface as COM2 (2FX, IRQ3) (default) E8, Pins 1 and 2 E8, Pins 3 and 4 E9, Pins 1 and 3 E9, Pins 2 and 4 E3, Pins 2 and 3 Select serial interface as COM2 (2FX, IRQ3) and modem or E4, Pins 1 and 2 second serial interface as COM1 (3FX, IRQ4). E8, Pins 1 and 3 E8, Pins 2 and 4 E9, Pins 1 and 2 E9, Pins 2 and 4 E3, Pins 2 and 3 Select serial interface as COM1 (3FX, IRQ4), disable E4, Pins 1 and 1 internal COM2. E8, Pins 1 and 3 E8, Pins 3 and 4 E9, Pins 1 and 3 E9, Pins 2 and 4 E3, Pins 1 and 2 Select serial interface as COM2 (2FX, IRQ3), disable E4, Pins 2 and 3 internal COM1. E8, Pins 1 and 2 E8, Pins 3 and 4 E9, Pins 1 and 2 E9, Pins 3 and 4 E3, Pins 2 and 3 Select modem or second serial interface as COM1 (3FX, E4, Pins 2 and 3 IRQ4), disable internal COM2. E8, Pins 1 and 3 E8, Pins 2 and 4 E9, Pins 1 and 2 E9, Pins 3 and 4 E3, Pins 1 and 2 Select modem or second serial interface as COM2 (2FX, E4, Pins 2 and 3 IRQ3), disable internal COM1. E8, Pins 1 and 3 E8, Pins 2 and 4 E9, Pins l and 3 E9, Pins 3 and 4 E3, Pins 1 and 2 Disable both internal serial ports. E4, Pins 1 and 2 E8, Pins 1 and 2 E8, Pins 3 and 4 E9, Pins 1 and 3 E9, Pins 2 and 4