DM32 Progs - John's Vademecum

Try to learn something about everything, and everything about somethingThomas Huxley “Darwin's bulldog” (1824-1895)

Trace: • 6502 based homebrew computer • Calculator Hardware • DM42 Info • Goals : 6502

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====== DM32 Progs ======

** Description **

===== Return Loss & SWR from Complex Impedance =====

Input Rs and Xs to calculate |z|, |ρ|, VSWR and R.Loss

=== Complex numbers in DM32 ===

The DM32/HP31Sii handles complex numbers by treating stack-X as //Real//, stack-Y and //Imaginary// for one complex number, and stack-Z as //Real// and stack-T as //Imaginary// for a second complex number. 

This means the normal 4 level stack can hold 2 complex numbers. This is similar to the HP41 Advantage Pack's method.

To store a complex number in a register actually requires two to be used - one for Real part and one for Imaginary part. This is similar to the HP15C/DM15L.

Then various "Complex" functions are access by <key>SHIFT</key><key>CMPLX</key><key>Function</key> for example to add

Z<sub>1</sub> = (10 + j20) and Z<sub>2</sub> = (30 - j25) = Z<sub>3</sub>

<code>
20 ENTER 10 ENTER
25 CHS ENTER 30
SHIFT CMPLX +
</code>

The display will show

<code>
20.0000
10.0000
-5.0000
40.0000
</code>


X has the real part of Z<sub>3</sub> (40) and Y has the imaginary part of Z<sub>3</sub> (-5)

Z<sub>3</sub> = 40 - j 5


===== Section Two =====


--- //John Pumford-Green 19/07/23 06:08//


===== Further Information =====


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