7521Plus / N N/B MAINTENANCE
8.11 SIO PORT TEST ERROR
An error occurs when a mouse or other I/O device is installed.
SH19 |
| COM1RTS# |
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| COM1TXD |
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U27 |
| COM1DTR# |
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SUPER I/O |
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PC97338VJG |
| COM1DSR# |
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| COM1CTS# |
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| COM1RI# |
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| COM1DCD# |
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| COM1RXD |
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+3V
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ISA_IRQ4 |
| SH18 |
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| U31 |
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| W83626F |
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SH19
U1
ADM3311
R1
100K
Q1
D/RTS#
D/TXD
D/DTR#
D/DSR#
D/CTS#
D/RI#
D/DCD#
D/RXD
PIN DEFINITION OF SIO PORT:
J507
LOOPBACK CONNECTOR
FOR SIO TEST
PIN 1,4,6 | SHORT |
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PIN 2,3 | SHORT |
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PIN 7,8,9 | SHORT |
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SH6 | RS232_OFF# |
U24 |
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SIS630S |
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PIN 1: | DCD…… | DATA CARRIER DETECT | PIN 6: | DSR….. | DATA SET READY |
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PIN 2: | RD…….. | RECEIVED DATA | PIN 7: | RTS….. | REQUEST TO SEND |
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PIN 3: | TD…….. | TRANSMIT | PIN 8: | CTS….. | CLEAR TO SEND |
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PIN 4: | DTR…… | DATA TERMINAL READY | PIN9: | RI…….. | RING INDICATOR |
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PIN 5: | SG…….. | SIGNAL GROUND |
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128
