DM41X PPC ROM

Various useful functions from the PPC ROM

• PPC Manual from here : https://literature.hpcalc.org/items/1330

Similar to other Solvers (e.g. the Advantage Pac Solve) but with some minor differences to be aware of.

• Put the Global Label (name) of the program (in this example it's LBL AA) containing the expression to be solved in register 6
  • ALPHAAAALPHA
  • XEQALPHAASTOALPHA06
• The program with the expression to be solved must be written as though unknown x is on the x-stack only
  • other solvers “fill the stack” with x
  • here you need to manipulate the stack to get x as needed. It's easiest is to just ENTER ENTER ENTER and then treat the stack the same as other solvers (i.e. as if it's filled with x and you use x<>y to pull a fresh copy of x as needed in the expression).
• Put a “step size” in y and a “start value” in x (e.g. -3)
  • 0 ENTER -3
• run SV

2x^2 + 3x -4 = 0

Prog “AA”

LBL AA
ENTER
ENTER
ENTER
x^2
2
*
x<>y
3
*
+
4
-
RTN

• 0 ENTER 1
• XEQALPHA SV ALPHA

and the answer comes…..

0.850781059

• 0 ENTER -3
• XEQALPHA SV ALPHA

and the answer comes…..

-2.350781060

— John Pumford-Green 24/01/26 10:29 GMT