29
SYMPTOM | POSSIBLE REMEDY |
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I am not sure how to | • In general, IRQ4 belongs to COM1. |
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set the IRQs. | IRQ3 belongs to COM2. COM3 and |
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| COM4 can be set to |
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| driven device on COM1 or 2 (e.g., a |
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| mouse). |
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| • The IRQ settings in your software must |
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| match the settings in Windows 95 |
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| Device Manager. |
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No response when | • Verify that the external device is |
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working at speeds | capable of those speeds. |
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exceeding 115Kbps. | • Make sure the board is set to high- |
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| speed mode with the J12 jumper. |
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The board will not | • Check the Windows 98/95 Device |
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work in | Manager and make sure the port is set |
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mode. | for |
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| Adapter” in Device Manager. These |
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| settings must not conflict with any |
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| other hardware. |
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Diagnostic programs | • The diagnostics program used must be |
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such as Checkit | capable of testing 650 UARTS. Most |
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report failures on | diagnostics programs can test only 450 |
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serial ports or wrong | and 550 UARTs. |
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UART speed. |
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