This is a purpose-built diagnostic tester designed to verify the functionality of Motorola and Hitachi 6309E / 6809E 8-bit microprocessors.

It performs a series of automated checks to confirm CPU integrity, address/data line operation, stack behaviour, and I/O functionality.

This is a CPU Tester I designed to test retro 6309E and 6809E CPU's from Hitachi ad Motorola. 

Note: This will not work with the 6309/6809 versions as it requires different hardware. 
See this listing for my 6309/6809 Tester https://www.ebay.co.uk/itm/257152138835



Features

  • Selectable Clock Speeds: 100 kHz, 1 MHz, or 2 MHz operation
  • Automatic CPU Identification: Detects and indicates whether a 6309E or 6809E CPU is installed
  • Bus Integrity Tests: Verifies all address and data lines for stuck or shorted conditions
  • RAM Verification: Performs read/write tests across multiple memory locations
  • Stack Integrity Tests: Exercises push and pull operations across all CPU registers to verify proper stack behaviour
  • I/O Function Test: Drives eight LEDs in a “Knight Rider” sweep pattern to confirm control line activity
  • Visual Status Indicators: Dedicated LEDs report CPU type, RAM test results, stack test results, and I/O activity

While this tester does not perform exhaustive opcode-level testing, it validates sufficient CPU functionality to distinguish between a working and a defective device.

Included:

  • 1 × 6309 / 6809 CPU Tester PCB (fully assembled and tested)
    Note: The 6309/6809 CPU itself is not included in this sale.


Operation:
  1. Insert the CPU into the ZIF socket, ensuring correct orientation (Pin 1 at top left).
  2. Connect a Mini USB Type B cable (not supplied) from a PC or regulated 5 V USB power source.
  3. Press the RESET button to initiate the test sequence.
Test Sequence Overview:
  • CPU detection routine identifies the installed processor type and illuminates the corresponding indicator LED.

  • RAM verification runs; if a RAM error is detected, LEDs D0–D3 will be lit.

  • Stack tests are performed; failures are indicated by LEDs D4–D7.

  • I/O test executes, driving LEDs in a continuous “Knight Rider” pattern to confirm correct output timing.

A demonstration video showing test output for a verified working CPU is available in the listing.


Item will be shipped with Royal Mail Tracked 48.



Please contact me if you have any queries and I will be only too happy to answer them.

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