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Accodata serial switch
RS232 serial port
Manufactured by: Accodata

Type: Serial port/printer switch
Interface: RS232
This device was used to switch 4 terminals to 2 printers. Any terminal may be connected to any printer. It has some buffering capabilities and automatic terminal selection.
It's built around MCS-48 compatible microcontroller (NEC D8749H unit).

 ROM dump


Power supply: 9V DC, + in the middle (2).