Sun 1 Keyboard

[top-posting and no-trimming damage repaired manually -Mouse] That's not it, then; the keyboards in question use plugs substantially narrower than RJ45 (or more correctly 8P8C, since it's not RJ45 unless you're putting POTS phone service on the middle pair). I think they were 4P4C, but might have been 6P6C - or more likely 6P4C. I'll assume your "RJ45" was just a (very loose) term for "modular plug/jack of unspecified size", for purposes of this email. For use on a stock RS232 serial port? No. You didn't specify that the adapter be completely passive, but it doesn't matter, because I don't think a serial port can drive enough power to run a Sun keyboard, so at a minimum you would need an external power supply. Also, the adapter would have to have some electroncis in it. Sun keyboards of the sort I'm discussing here use RS232 data rates, character size, and framing, but they use TTL voltage levels, not RS232 voltage levels. You need some electronics. What I find msot convenient is a MAX232 or equivalent and two inverters (and an external 5V supply). A completely passive 4P4C (or 6P4C, whichever it is) to DB25 adapter will not get the voltage levels right. Even if you tie signal ground to 2.5V, the voltage swing isn't enough; IIRC RS232 specifies at least 3V either way from ground. (I _think_ the direction of the swing is backwards, too, but I'd have to check that.) When I wrote... ...I was talking about an adapter to not a serial port such as is typically put on a DB-25, but to a DA-15 port dedicated to the keyboard and mouse. In the machine, it was connected to an ordinary UART port, but without the level shifting circuitry serial ports generally have to map between logic voltage levels and RS232 voltage levels. /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTML mouse at rodents-montreal.org / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B