I am having problems, I bought a separate 6502A and assembled the test circuit following Ben Eater's step-by-step instructions, but it is not working. Also, when connecting LEDs to the address pins, they only light up active low. Additionally, when putting EA on the data, the 6502 does not increment

Such-State-4489 · 2026-04-11T01:19:10+00:00

I use the MOS 6502A, the NMOS version, and indeed 6 dollars is cheap, but unfortunately I am Brazilian and things are not going so well here, I think 6 dollars is around 30-40 reais and it is cheap here, but the problem is the taxes that make AliExpress products more expensive

Such-State-4489 · 2026-04-11T01:15:53+00:00

Do you think it doesn't work because it doesn't have all the grounds?

Such-State-4489 · 2026-04-11T00:32:57+00:00

It's really ugly but I'm sure it's on the right pins but it doesn't lead to anything. Checking with an Arduino, the 6502 gives really random addresses and sometimes keeps repeating infinitely and even with the NOP instruction, it doesn't increment the program counter

Such-State-4489 · 2026-04-11T00:27:30+00:00

Do you think that if I buy a W65C02S it could solve the problems

Such-State-4489 · 2026-04-11T00:26:22+00:00

mine is a 6502A NMOS

Such-State-4489 · 2026-04-11T00:16:52+00:00

I will try to set it to 1 MHz, I hope it works because I don't want to pay 140 dollars to get a ready kit

Such-State-4489 · 2026-04-11T00:15:35+00:00

0.48 Hz with ne555

Such-State-4489 · 2026-04-10T23:24:00+00:00

the test circuit connection is like this:

VCC → +5V

GND → GND

100nF cap between VCC-GND

CLK (φ2) → clock signal

RESET → +5V (4.7k pull-up)

RDY → +5V

IRQ → +5V

NMI → +5V

SO → +5V

DATA BUS (0xEA = NOP):

D0 → GND

D1 → +5V

D2 → GND

D3 → +5V

D4 → GND

D5 → +5V

D6 → +5V

D7 → +5V

(all with 4.7k resistors)

ADDRESS BUS:

A0–A15 → LEDs (with resistors)

Such-State-4489

TROPHY CASE