Good morning and [hopefully!] quick question,

I have been working on making some routines in hexadecimal assembly on-calc to speed up some BASIC programs, thus far been executing the ASM programs as is typical. My question is, is there any way to exchange actual information? Do the variables A through Z (and θ) all have memory addresses which an assembly program could possibly access?

I would imagine they would need to have a fixed address, if so, what would that address be?

a simplistic pseudo-code; 1 is passed into variable A, where the assembly program loads it into HL, increments HL, and puts HL back into A. A is then displayed (hopefully a two) from the basic program


Code:


Is such a thing possible? If so how is this done?

Thanks,
Blackhawk

Yes.
No.

I'm not going to indulge the "hexadecimal" thing, because I've written many a rant against directly coding in hexadecimal instead of just writing assembly programs that are more readable and easier to maintain, so I'll show you how to do this in proper assembly:
Code:
So, let's go through this:
1) ld hl,VarX \ rst 20h copies up to 9 bytes to Op1. Those 9 bytes are the identifier for variable X.
2) rst 10h is equivalent to calling FindSym, which looks for that variable in the calculator's memory. ret c returns if the carry flag is set, which indicates that the variable wasn't found. If it existed, then the carry flag is reset (ie, nc).
3) ex de,hl \ rst 20h copies the 9 bytes of the variable's value from its memory location into Op1
4) bcall(_ConvOp1) converts the 9-byte floating-point number in Op1 into a 16-bit value in de. This is much easier to manipulate in your ASM programs.

Nevermind, I figured it out through Ans

Code:



Code:


These together output "2"