Great news! The Ultimate Expansion Board for the V4 Stand Alone has been tested and approved by Apollo Computer, and the design has gone GOLD! Production is underway. The board will be sold through Apollo Computer either as the board (ready for install into your own mini-ITX or ITX case), or pre-installed in a the glass-topped silver mini-ITX case​ (the "Predator Kit" option). Stay tuned for updates as we near release!


Quetzal presents a new video showing the configurability of the V4 Ultimate Expansion Board from the Amiga operating-system side, on the new final prototype PCB!


Quetzal and Eule are proud to officially introduce the Ultimate V4 Expansion Board! This is mini-ITX formfactor PCB that holds the Amiga-compatible Apollo V4 computer, and provides a host of extra functionality and I/O.

Please register interest by sending an email to v4expansion@gmail.com. Thanks to everyone who has registered to date. We will be in touch in due course.

The first prototype PCB is completed, and key functionality is demonstrated in the video below. 


A video showing the MIDI capabilities of the V4 Ultimate Expansion Board are shown in the below video (recorded earlier in development).

Key functions of the V4 Ultimate Expansion Board include the following:

Audio related:

  • 16-bit high-quality analogue audio output, with separate ultralow-noise LDO power regulator. 112 dB SNR, and -93 dB THD. Playback both PAULA AND ARNE audio at high quality!

  • Pass-through of analogue audio out to case 3.5 mm audio jack using the standard case HD AUDIO/AC97 connector.

  • MIDI in/out (serial.device; using beat-buddy format connector due to space constraints).

Serial related:

  • Buffered serial UART in/out for FTDI cable (serial.device), 3V3 and 5V input tolerant.

  • RS232 in/out (RX/TX lines) (serial.device).

Power control:

  • Integration with standard ITX front-panel case buttons and LEDs.

  • Full hardware cold reset from a single press of the case power/reset button.

  • Full startup/shutdown from the ITX case power button (power removed from V4). Soft glowing LED when the V4 is powered down.

  • LED output selectable for single-led system (combined POWER and IDE access) or dual-led system (separate POWER and IDE access).

  • 12V input from a wide range of inputs: a barrel jack connector (external), ATX PSU connector (internal), or PC peripheral connector ('Molex') (internal).

  • Separate 5V lines for powering the Apollo V4, and peripherals (e.g., USB).

  • Provision of SAFE +5V and +12V passthrough for powering external components like drives/CD-ROMs for the V4.

  • Smart power meter for voltage and current measurement of the 12V supply, and two 5V lines.


  • Passthrough for legacy DB9 mice and joysticks. USB keyboard port from the V4 is accessible directly from the rear panel of the Ultimate Expansion Board.

  • USB mouse accessible via USB header on the board, for connection to case or expander USB ports. Both USB2 and USB3 headers are provided to ensure maximum case compatibility. 

  • Second USB gamepad port provided on the internal USB header, for both V4 and V4+ systems (i.e., it provides the second gamepad port for original V4 board owners).


  • Mini-ITX form factor, for install into any Mini-ITX compatible case.

  • A 3-pin fan header for powering 12V fans.

  • Internal mounting of USB blaster with mini-USB socket on the rear ITX panel, for easy FPGA programming. No more opening of the case to plug in the USB blaster!

  • Internal programming header for on-board microprocessor (3V3 FTDI)

  • Multi-colour LED back-lit V4 logo

  • 1.8" 160x128 pixel colour LCD, with communication directly from the Apollo V4!

  • On-board temperature sensor for system monitoring.

As the board is in development, these functions are subject to change as development progresses.

Naturally, people are enquiring about the price of the board. At this stage, we are targeting a break-even with production of 100 units, to cover development and manufacture costs. As this is a premium board with high-end components, we are expecting the board cost to be not less than 300 Euro. We can confirm pricing once the board is completed and the PCB production costs finalised.

We have also had enquiries for people wanting pre-assembled systems. We are currently sourcing suitable cases to provide these systems which will be 'V4 drop in ready', out of the box.


They've arrived! The Ultimate Expansion Board PCB's are now with us, and are undergoing final testing and assembly. Please see the video below for footage of the first commercial board :)