 Acer File Extensions |
Epson 8148 (Type A, 8KB)
The 8148 serial interface is an optional interface for incorporation into the Epson range of printers, and is designed for printing data out from a computer equipped with a serial interface. Data entry is made via an internal 8-K bytes RAM buffer, which is operated by a 4Kbytes ROM program. X-ON/X-OFF protocol can be used.
| Switch No. | Function | On | Off |
|---|---|---|---|
| SW1-1 | Word length selection | 7 bits | 8 bits |
| SW1-2 | Parity check | Enable | Disable |
| SW1-3 | Parity Selection | Even | Odd |
| SW1-4 | Flag Selection | Negative | Positive |
| SW1-5 | Bit rate selection | See table 1 | |
| SW1-6 | Bit rate selection | See table 1 | |
| SW1-7 | Bit rate selection | See table 1 | |
| SW1-8 | Bit rate selection | See table 1 | |
| Switch | Function |
|---|---|
| SW2-1 | OFF: 8-bit word length |
| SW2-3 | Flag reset timing - See table 2 |
| SW2-4 | Flag reset timing - See table 2 |
| SW2-5 | ON: Self-test - Enable |
| SW2-5 | OFF: Self-test - Disable |
| SW2-6 | ON: Self-test mode - Line monitor |
| SW2-6 | OFF: Self-test mode - Loopback |
| Jumper | Function |
|---|---|
| J1 | ON: Pull up TTY-TXD to +12V via 470-ohm resistor. (See Note 1) |
| J2 | ON: Connect TTY-TXD Return to signal ground. (See Note 1) |
| J3 | ON: Connect TTY-TXD Return to signal ground. (See Note 1) |
| J4 | ON: Pull up TTY-TXD to +12V via 470-ohm resistor. (See Note 1) |
| J5 | ON: Pull up DSR to +12V |
| J6 | ON: Pull up DCD to +12V |
| J7A | ON: 8k-byte RAM is used (See Note 2) |
| J7B | ON: 2k-byte RAM is use (See Note 2) |
| J8B | ON: Send X-ON/X-OFF signal |
| J8A | ON: Do not send X-ON/X-OFF signal |
| J9A | Not used (Always OFF) |
| J9B | ON: mPD7810 is used as CPU (See Note 3) |
| JX | ON: X-ON/X-OFF control is used for handshaking in Current Loop mode (See Note 4) |
| JF | ON: Flag control is used for handshaking in Current Loop mode (See Note 4) |
| JCL | ON: Receive data in Current Loop mode (See Note 5) |
| JRS | ON: Receive Data in RS-232C mode (See Note 5) |
Notes:
1. If the host computer is not equipped with the power supply for the Current Loop interface, these jumpers must be connected to perform communication via the Current Loop interface.
2. Either J7A or J7B jumper must be connected. Since the interface board is factory-set to use the 2K-byte RAM, J7B is connected by a printed pattern. Cut this pattern and connect J7A if the 8K-byte RAM is to be used.
3. Either J9A or J9B jumper must be connected. Note that the mPD7811 includes internal masked ROM, while the mPD7810 is operated by an external ROM.
4. JX and JF Jumpers cannot be connected at the same time.
5. JRS and JCL jumpers cannot be connected at the same time.
Table 1
| Baud Rate | SW1-5 | SW1-6 | SW1-7 | SW1-8 |
|---|---|---|---|---|
| 75 | ON | ON | ON | ON |
| 110 | ON | ON | ON | OFF |
| 135 | ON | ON | OFF | ON |
| 150 | ON | ON | OFF | OFF |
| 200 | ON | OFF | ON | ON |
| 300 | ON | OFF | ON | OFF |
| 600 | ON | OFF | OFF | ON |
| 1,200 | ON | OFF | OFF | OFF |
| 1,800 | OFF | ON | ON | ON |
| 2,400 | OFF | ON | ON | OFF |
| 4,800 | OFF | ON | OFF | ON |
| 9,600 | OFF | ON | OFF | OFF |
| 19,200 | OFF | OFF | ON | ON |
Table 2
| Flag Reset (bytes) | SW2-3 | SW2-4 |
|---|---|---|
| 152 | OFF | OFF |
| 288 | OFF | ON |
| 560 | ON | OFF |
| 1,936 | ON | ON |