I originally aquired a control panel to run the Spy Hunter Arcade ROM with MAME on a PC... After some repair, it works great.
My current MAME Setup running Spy Hunter ROM
Condition as received
After I repaired the control panel, I added a USB interface board.
The goal is to also develop a CoCo connection for this control panel. Basic idea is to use both Joystick Inputs for the game:
(2) Analog Inputs - Steering and Speed from one joystick
(6) Digital Inputs: Both joystick buttons + (4) high and low hardwired postions on the other joystick pots.
See 'Arcade Control Panel' page for details.
This is a picture of the USB interface board I used, which can be found at U-HID.com