Martin Nilsson wrote:
.........
> 1. In DOS, run DEBUG and give the following command:
>
>    o 37a 4
>
.........
> 2. Use an ammeter to measure the current between GND (any pin 18-25)
> and pins 1, 14, 16, and 17, respectively.
>
> 3. For a 4.7k pullup, this current should be about 1mA (=5V/4.7kOhm).


Martin:

Be carfull, most DMMs when measuring current have a voltage drop
(burden) that causes them to understate the current.  You can check
this by manually increasing the range to the Amps range, or use a
shunt resistor and measure the voltage drop before and after it is
installed.

Have Fun,
Brooke