[vcf-midatlantic] Making a PCjr Serial Port Adapter for a Serial Mouse

[Dan FitzGerald]

I'm cross-posting this here from the VCF Forums, because its been two 
days and I am still absolutely stuck on this.

I have a working Microsoft serial mouse that I have successfully tested 
on my 5155. I have a PCjr. I made a DB-9 adapter for the RS-232 serial 
port on the PCjr. I plug my mouse in, and the Microsoft Mouse driver 
recognizes it, mouse test software indicates that it can register left 
and right button presses, but I can't get the cursor to move!

Is there some sort of secret that I don't know about? I've checked my 
connections with the multimeter, all are good. I'm using a DB-9 male 
adapter on one end and a 2x4 berg connector on the other end. This is 
the pinout I am using:

PCjr RS232 pinout (direction: you are staring at the back of the PCjr):

          1     2     3     4     5     6     7     8
      A (XXX) (DTR) (RTS) (TxD) (DCD) (DSR) (CTS) (RxD)
      B (GND) (XXX) (XXX) (XXX) (XXX) (XXX) (XXX) (XXX)


This is the pinout of the male DB-9 plug (direction: you are staring at 
the plug):

        1         2         3         4         5
      (DCD)     (RxD)     (TxD)     (DTR)     (GND)

           (DSR)     (RTS)     (CTS)     (RI )
             6         7         8         9

Note: Pin 9 is not wired, as RI is not used on a PCjr's RS-232 port.

And as far as I can tell, this is what is supposed to be the pinout of a 
Microsoft Serial Mouse (Female DB-9, direction: you are staring at the 
plug):

        5         4         3         2         1
      (GND)     (   )     (TxD)     (RxD)     (   )

           (   )     (   )     (RTS)     (   )
             9         8         7         6

-- 
Regards,
Dan FitzGerald
They/Them or She/Her
Classical Computing Laboratory at IBM-Poughkeepsie
http://www.vm.ibm.com/devpages/dfitzger