Sinclair ZX80 / ZX81 / Z88 Forums

I came to: poke 22079,0; Poke 22080,0 causes the ship to continually drop bombs, i can not find where is the reference to directions and shot.

Hello. I'm analyzing Scramble 81 game code to convert it to ZX-Pand interface support. But I do not know if it's over me. The game runs from address 22411. I found one procedure referring to the keyboard at address 1981 (drop bomb). I can not find a reference to the directions and shot. Does this ga...

There are basically 2 types of input routine. 'typing' - one key code is read at a time using the ROM routines. 'gaming' - direct reading of the keyboard rows using the IN instruction. You need to load the target game into an emulator and identify where the movement code is located. This is the har...

Thanks for the reply.
Sorry for the question:
How can an example keyboard read procedure look like? I would like to know where to start ...

Hello.
After more than 25 years, I began to re-engage with the ZX-81. I also bought ZX-Pand recently. It is good that there are so many enthusiasts of this equipment. To the top of the question: Which ports do ZX81 read the keyboard? I want to try to modify the game to work with ZX-Pand joystick.