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Anyone have the manual for this Epson "2KIF" RS-232 (maybe current loop too?) serial interface board? It fits inside my Epson FX-100 wide carriage dot matrix printer as a secondary interface. I need to know what the DIP switches do. So far, I think SW2-1 through 4 are baud rate but the rest are a mystery.

EDIT: Located! See next reply.

#RetroComputing

A green circuit board with lots of through hole IC's and passives.
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This entry was edited (2 weeks ago)

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in reply to paulrickards

gloriouscow
gloriouscow
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peel.dk/Archive/Epson/Epson%20…
in reply to gloriouscow

paulrickards
paulrickards
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@gloriouscow Hey thanks! I found that one too (Y49099103005) but I think it's a different model. My card (Y49020800000) SW1 only four bits while this card SW1 is 8 bits. The baud rate chart does match though. The rest don't seem to behave as that manual indicates.
@gloriouscow
in reply to gloriouscow

paulrickards
paulrickards
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I think@gloriouscow@oldbytes.space I think that's it! Also, I was wrong! The silkscreen for SW1 is ABOVE the 8-bit DIP. The one for SW2 was close to it but it referenced the 4-bit DIP. This will likely solve things. Thanks!!
in reply to paulrickards

gloriouscow
gloriouscow
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in time stuff like this will rot completely off the web...

i wish we could preserve everything

in reply to gloriouscow

gloriouscow
gloriouscow
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cool little card. The NEC D80C35C there on the left does serial to parallel translation
in reply to paulrickards

Richard "mtfnpy" Harman (he/him)
Richard "mtfnpy" Harman (he/him)
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oh man, mention of an Epson FX-100 brings back memories of reading the manual as a kid, and programming BASIC on my PCjr to print things in double strike. I will never forget the sound!
in reply to paulrickards

paulrickards
paulrickards
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Thanks to @gloriouscow for a link to the Epson 2KIF 8145 Y49020800000 RS-232 Serial / Current Loop interface board manual for my Epson FX-100.

Manual was key: it explained the stop bits are automatically determined by baud rate. 9600 baud has 2 stop bits. All others have 1 stop bit. Explains the bizarre behavior! 🙃

The DIPs that worked for me at 9600 8N2:
SW1 10001010
SW2 0101

Wiring (PC->Printer) hardware flow on CTS:
TX -> RX
DTR -> CTS
GND -> GND

oldbytes.space/@gloriouscow/11…

#RetroComputing

gloriouscow

2025-04-27 20:47:22


peel.dk/Archive/Epson/Epson%20…

#retrocomputing @gloriouscow
in reply to paulrickards

voipmeister :verified:
voipmeister :verified:
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This is from another Epson board’s manual that also has 2 dip switches. Might work for you, settings seem plausible. Taken from files.support.epson.com/pdf/c8…
Screenshot from an Epson manual for a serial interface card, describing dip switch settings.
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