The program REACTIE from Hans site

[Neil Andretti]

There is a reaction game on Hans site called "reactie" ... It is in a bad shape, the binary is none, it's just a text with .bin ending, and the assembler code has  some obvious flaws...

Maybe you can help me here. I'm stuck.

How the program should work:

When you start it, the HEX display goes blank. After a random time a timer younts up until you push a button on the keypad. Then it should display a comment on how you did.

I've put it in a modern dialect and assembled it, it works until you push the key. The display starts showing garbage. 

 What makes no sense is line 195 "sta $0305" self modifying code? did I miss something? 

In the zip file you find the original and my humble tries...

If you need a nut to crack for this weekend, here it is ;)

Nils 

[Neil Andretti]

I found the original program in one of the KIM Kenner magazines. I corrected the source a bit to make it compilable at very adress, even if you shift one byte... 

It works now.

Have fun!

[Kurt Pieper]

Hi Nils,

Thanks for your work.
The program works for me too.

It's interesting to see how the guys used the KIM-1 

and other 6502 processors, both back then and today.

You can always learn something.

Best regards,
Kurt

[GN Liu]

Hard work for digging!