16 Nov
2008
16 Nov
'08
12:30 p.m.
I came across something strange that I need some help with. Pictures
are here:
http://www.brutman.com/2008_1117_140718_RS232_conv_back.jpg
http://www.brutman.com/2008_1117_140718_RS232_conv_top.jpg
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.
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.
Does anybody know another machine or card that might have used the 20
pin header for a serial port? I'm almost thinking that I'm missing
another piece (a card internal to the machine) that the header goes to.
Regards,
Mike
