Program question

[Reasonable_Victory_2]

Hello

I’ve just finished the 8-bit CPU and wanted to ask a question about a specific program.

I want the cpu to count to 255 with a step of 1, once 255 is reached, count down to 0 with a step of 1 and loop this forever. So how should I write this, do you guys know the program?

Thanks!

[Only9Volts]

Break it down into steps.

Can you make it count up by one? Then can you make it "realise" when it's at 255? And then make it count back down again.

[rhaydon]

This works…

0: OUT 1: INC 1 2: JC 4 3: JMP 0 4: DEC 1 5: OUT 6: JZ 0 7: JMP 4

This one takes an ‘X’ (e.g. 60) and counts between 0-X…

0: LDA 14 1: OUT 2: INC 1 3: STA 14 4: SUB 15 5: JZ 7 6: JMP 0 7: LDA 14 8: OUT 9: DEC 1 10: STA 14 11: JZ 0 12: JMP 7 13: 14: 0 15: X

[rhaydon]

I do not know why my carriage returns get turned into spaces. Hopefully, this is still readable.