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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.FunctionOnOff
SW1-1Word length selection7 bits8 bits
SW1-2Parity checkEnableDisable
SW1-3Parity SelectionEvenOdd
SW1-4Flag SelectionNegativePositive
SW1-5Bit rate selectionSee table 1
SW1-6Bit rate selectionSee table 1
SW1-7Bit rate selectionSee table 1
SW1-8Bit rate selectionSee table 1


SwitchFunction
SW2-1OFF: 8-bit word length
SW2-3Flag reset timing - See table 2
SW2-4Flag reset timing - See table 2
SW2-5ON: Self-test - Enable
SW2-5OFF: Self-test - Disable
SW2-6ON: Self-test mode - Line monitor
SW2-6OFF: Self-test mode - Loopback


JumperFunction
J1ON: Pull up TTY-TXD to +12V via 470-ohm resistor. (See Note 1)
J2ON: Connect TTY-TXD Return to signal ground. (See Note 1)
J3ON: Connect TTY-TXD Return to signal ground. (See Note 1)
J4ON: Pull up TTY-TXD to +12V via 470-ohm resistor. (See Note 1)
J5ON: Pull up DSR to +12V
J6ON: Pull up DCD to +12V
J7AON: 8k-byte RAM is used (See Note 2)
J7BON: 2k-byte RAM is use (See Note 2)
J8BON: Send X-ON/X-OFF signal
J8AON: Do not send X-ON/X-OFF signal
J9ANot used (Always OFF)
J9BON: mPD7810 is used as CPU (See Note 3)
JXON: X-ON/X-OFF control is used for handshaking in Current Loop mode (See Note 4)
JFON: Flag control is used for handshaking in Current Loop mode (See Note 4)
JCLON: Receive data in Current Loop mode (See Note 5)
JRSON: 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 RateSW1-5SW1-6SW1-7SW1-8
75ONONONON
110ONONONOFF
135ONONOFFON
150ONONOFFOFF
200ONOFFONON
300ONOFFONOFF
600ONOFFOFFON
1,200ONOFFOFFOFF
1,800OFFONONON
2,400OFFONONOFF
4,800OFFONOFFON
9,600OFFONOFFOFF
19,200OFFOFFONON

Table 2

Flag Reset (bytes)SW2-3SW2-4
152OFFOFF
288OFFON
560ONOFF
1,936ONON