Various useful functions from the PPC ROM

Similar to other Solvers (e.g. the Advantage Pac DM41X 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 (as it it's filled with x and use x<>y to pull a fresh copy of x as needed * Put a “step size” in y and a “start value” in x (e.g. -3) * 0 ENTER -3 * run SV ==== example ==== 2x^2 + 3x -4 = 0 Prog “AA” <code> LBL AA ENTER ENTER ENTER x^2 2 * x<>y 3 * + 4 - RTN </code> === for the first root === * 0 ENTER 1 * XEQALPHA SV ALPHA and the answer comes….. 0.850781059 === for the second root === * 0 ENTER -3 * XEQALPHA SV ALPHA and the answer comes….. -2.50781060''

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