Perfect(ish) grayscale in Axe

Here's a skeleton structure that should allow a crystal timer interrupt suitable for grayscale display. For controlling the interrupy delay, I'd recommend simply storing it in a variable and, whenever it's changed, call SetD() with that new value.

I can't guarantee that this works, but I hope it does. It may require the latest version of Axe (1.2.1).


Setup code:
 - make sure the calculator is not an 83+ first with Normal!
----------------------------------------
<initial delay>:SetD()    .recommended: ~180
Asm(3E40D330)
fnInt(Int,)


Teardown code:
----------------------------------------
Asm(AFD330)
LnRegʳ


Interrupt code:
----------------------------------------
Lbl Int
Asm(3E08D3033E02D331DB32D332)
DispGraphʳʳ
.perhaps more code
Return


Routine to set the interrupt delay:
 - input: 8-bit unsigned integer
 - bad stuff will happen if this is too low
 - recommended: enforce range to ~150-255
----------------------------------------
Lbl SetD
Asm(7DD332)
Return