This application is a 4 to 20mA converter sensing via a 120R resistor and reading
the ADC and displaying the result on the MDM-1.

In this application the Vref+ is the supply voltage (+2.5V) from a TL431 and Vref-
is 0V. The scaling is based on y = mx + c the  straight line graph equation where m is
the gradient and c is the value where it crosses the y-axis (intercept).  m and c have
been calculated and equate to 0.16352x - 72.132c.  x is the ADC reading between 0 and
1023.  The result is multiplied by 10.  The display provides a decimal point to show
tenths of a degree centigrade.

The delay routines delay.c and delay.h are taken from the Hi-Tech samples.

The checksum of the code is 7CCD.

