Pin Assignments
B.2 Serial Port Connector
The pin assignment of the serial (COM1) port connector is as follows:
No | PIN ASSIGMENT (by: sort) | DESCRIPTION |
1 | DCDA#_T:I | Active low Data Carrier Detect inputs for the serial port. |
2 | SINA_T:I | Receiver serial data input for port 1. |
3 | SOUTA_12:O | Transmit serial data output for port 1. |
4 | DTRA#_6:O | Active low Data Terminal Ready outputs for the serial port. |
5 | GND | Ground |
6 | DSRA#_T:I | Active low Data Set Ready inputs for the serial port. |
7 | RTSA#_6:O | Active low Request to Send Outputs for the serial port. |
8 | CTSA#_T:I | Active low Clear to Send inputs for the serial port. |
9 | RI#_T:I | Active low Ring Indicator inputs for the serial port. |
B.3 Parallel Port Connector
The pin assignment of the parallel/printer (LPT1) port connector is as follows:
| No | PIN ASSIGMENT(by: sort) | Description |
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| 1 | STB#/DS0#_D14/_P14/_D12:O | An active low pulse on this output is used to strobe |
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| the printer data into the printer. |
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| The STROBE output is the complement of Bit 0 of the |
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| printer control register. |
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| Refer to parallel port description for use of this pin in |
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| ECP and EPP mode. |
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| Active low outputs select driver 0 |
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| 2 | PD0/INDEX3#_P14/_S:IO/I | Port data 0 |
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| This active low Schmidt trigger input senses from the |
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| disk drive that the head is positioned over the |
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| beginning of a track as marked by an index hole. |
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| 3 | PD1/TRK0#_P14/_S:IO/I | Port data 1 |
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| This active low Schmidt trigger input senses from the |
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| disk drive that the head is positioned over the |
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| outermost track. |
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| 4 | PD2/WRTPRT#_P14/_S:IO/I | Port data 2 |
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| This active low Schmidt trigger input senses from the |
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| disk drive that a disk is write protected. |
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| Any write command is ignored. |
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| 5 | PD3/RDATA#_P14/_S:IO/I | Port data 3 |
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| Raw serial bit stream from the disk drive, low active. |
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| Each falling edge represents a flux transition of the |
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| encoded data. |
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| 6 | PD4/DSKCHG_P14/_S:IO/I | Port data 4 |
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| This input senses that the driver door is open or that |
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| the diskette has possibly been changed since the last |
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| drive selection. |
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| 7 | PD5_P14:IO | Port data 5 |
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| 8 | PD6/MTR0#_P14/_D12:IO/O | Port data 6 |
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| This active low outputs select motor drives 0. |
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| 9 | PD7_P14:IO | Port data 7 |
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| 10 | ACK#/DS1#_T_D12:I/O | A low active output from the printer indicating that it |
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| has received the data and is ready to accept new |
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| data. |
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| Bit 6 of the printer status register reads the ACK# |
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| Input. |
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| Refer to parallel port description for use of this pin in |
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| ECP and EPP mode. |
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| 11 | BUSY/MRT1#_T/_D12:_I/O | This is a status output from the printer, a high |
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| indicating that the printer is not ready to receive new |
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| data. |
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| FIC A550 Service Manual | ||
