And what is the second most likely thing to do with a new 4-bit CPU that has a 4-LED OUTPUT? Larson scanner of course!
This is basically the program: 
OUT b0001 
OUT b0010 
OUT b0100 
OUT b1000 
OUT b0100 
OUT b0010 
JP 0
But I've added in some dummy ADD A, 0 instructions as a kind of NOP inbetween to compensate for the JP requiring a clock cycle too.
Full details here: <a href="https://emalliab.wordpress.com/2025/09/28/td4-4-bit-diy-cpu-part-2/" target="_blank" rel="noopener noreferrer">https://emalliab.wordpress.com/2025/09/28/td4-4-bit-diy-cpu-part-2/</a>
Kevin

And what is the second most likely thing to do with a new 4-bit CPU that has a 4-LED OUTPUT? Larson scanner of course! This is basically the program: OUT b0001 OUT b0010 OUT b0100 OUT b1000 OUT b0100 OUT b0010 JP 0 But I've added in some dummy ADD A, 0 instructions as a kind of NOP inbetween to compensate for the JP requiring a clock cycle too. Full details here: https://emalliab.wordpress.com/2025/09/28/td4-4-bit-diy-cpu-part-2/ Kevin

And what is the second most likely thing to do with a new 4-bit CPU that has a 4-LED OUTPUT? Larson scanner of course!
This is basically the program: 
OUT b0001 
OUT b0010 
OUT b0100 
OUT b1000 
OUT b0100 
OUT b0010 
JP 0
But I've added in some dummy ADD A, 0 instructions as a kind of NOP inbetween to compensate for the JP requiring a clock cycle too.
Full details here: <a href="https://emalliab.wordpress.com/2025/09/28/td4-4-bit-diy-cpu-part-2/" rel="noopener noreferrer">https://emalliab.wordpress.com/2025/09/28/td4-4-bit-diy-cpu-part-2/</a>
Kevin

TD4 4-bit CPU "Larson Scanner"

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TD4 4-bit CPU "Larson Scanner"

TD4 4-bit CPU "Larson Scanner"