RS232 voltage level converter box
ard at p850ug1.demon.co.uk
Sun Nov 16 16:10:00 CST 2008
> It looks like a converter box that takes TTL level serial signals and
> converts to RS232 levels, kind of like the MAXIM single chip solution
> except that it is using 1488 and 1489 chips.
OK, such things did exist.
> The problem is that it came with a PCjr, but it doesn't physically plug
> into a PCjr. The onboard serial port is only 16 pins, while the
> rectangular connector here is 20 pins. It physically doesn't work.
And the PCjr serial port is at RS232 levels anyway. The PCjr seiral cable
is just a cahle, no intenral componnets (I have the PCjr TechRef with
If it was used wit ha PCjr, then I would guess that the PCjr was
connected to the RS232 side of this coverter, and some other device,
using a TTL level serial port, was connected to the 20 pin header.
I can't think fo anything offhand that would have such a port. It might
have been something very specialised (say to control or program some
measuring instrument or something).
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