6502 tester features advanced CPU testing compared to simple NOP testers executing NOP instruction in an endless loop cycle.

Selectable clock frequency 1MHz, 2MHz, 4MHz and 8MHz with DIP switch. Supported CPUs are NMOS 6502, CMOS W65C02 (selectable by switch) and rare 6502C "Sally" CPU used in ATARI computers and some arcade games (6502 switch position). Identifying "Sally" is simple by pressing the HALT button, program execution stops immediately. The HALT button press doesn't influence function when testing standard 6502 NMOS/CMOS CPUs.

External EEPROM contains test software exercising address lines A0-A15 and showing running light on port P0-P7. All LEDs A0-A15 must be active during the test (lighting or flashing) to prove address bus functionality.

Tester is powered by USB, Mini USB cable isn't provided.