Jumper settings for EV-170/EV-170A

Serial port 1 switch settings, SW1

COM Switch 1 Switch 2 Switch 3 Switch 4
1 ON OFF OFF OFF
2 OFF ON OFF OFF
3 OFF OFF ON OFF
4 OFF OFF OFF ON
Disabled OFF OFF OFF OFF

Serial port 2 switch settings, SW1

COM Switch 5 Switch 6 Switch 7 Switch 8
1 ON OFF OFF OFF
2 OFF ON OFF OFF
3 OFF OFF ON OFF
4 OFF OFF OFF ON
Disabled OFF OFF OFF OFF

The COM I/O port addresses are fixed:

COM Port I/O address
1 3F8
2 2F8
3 3E8
4 2E8

IRQ selection (SERCHINT jumper block: 4 columns, three rows)

An example is: R2C4 - R3C4 means Row 2 Column 4 connected to Row 3 Column 4

IRQ Serial port 1 Serial port 2
2 R2C4 - R3C4 R1C4 - R2C4
3 R2C1 - R3C1 R1C1 - R2C1
4 R2C2 - R3C2 R1C2 - R2C2
5 R2C3 - R3C3 R1C3 - R2C3

To disable IRQs, do no install any jumpers

Parallel port I/O mode

The PIO mode jumper should be set to the leftmost two for printer mode, and the rightmost two for general I/O mode.

LPT assignment (LPTSEL, 2 columns, 3 rows)

LPT Port address LPTSEL setting
1 3BC R3C1 - R3C2
2 378 R1C1 - R1C2
3 278 R2C1 - R2C2
Disabled - No connections

LPT interrupts (PTRINT)

IRQ5 is the leftmost two pins connected, IRQ7 is the rightmost two.

Real Time Clock (CLKINT)

IRQ CLKINT setting
2 R1C1 - R2C1
5 R1C2 - R2C2
7 R1C3 - R2C3
Disabled No connections
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