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6502A and 6502B

Status: Open.

#21 In SingleStepTests/65x02;

· jcollie opened on Sep 4, 2026

Incorrect behaviour of $cb and $db instructions on non-WDC CMOS chips

Status: Open.

#20 In SingleStepTests/65x02;

· BulbulatorMacher opened on Feb 15, 2026

Incorrect memory access for CMOS NOPs $dc and $fc

Status: Open.

#19 In SingleStepTests/65x02;

· BulbulatorMacher opened on Feb 15, 2026

WDC 65C02 cycle count seems incorrect for opcode $5C

Status: Open.

#12 In SingleStepTests/65x02;

· sidneycadot opened on Dec 15, 2024

Traceability of the test results

Status: Open.

#11 In SingleStepTests/65x02;

· sidneycadot opened on Nov 30, 2024

The 6502 tests assume the P register has bits 4 & 5.

Status: Open.

#8 In SingleStepTests/65x02;

· TomHarte opened on Jul 27, 2024

WDC 65C02 STZ issue

Status: Open.

#7 In SingleStepTests/65x02;

· TomHarte opened on Jul 27, 2024

nes6502: LXA ($AB) Constant Adjustment

Status: Open.

#2 In SingleStepTests/65x02;

· L-Spiro opened on Jun 9, 2024