RS232 voltage level converter box

[steve stutman]

Michael B. Brutman wrote:
>
> 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
>
Might be TTL/232 converter for a HAM rig, specifically Kenwood TS-930 or 
'940.