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Ken Lill, the owner of this PCB, wrote:

These are photos of the Bally add-under bare PCB.  This was given to me back
in 1982-ish by John Perkins, when he gave me the Blue Ram rights.  I also
received, but have since lost, all of the EPROMS and schematics to build it
(I had all of the EPROMS for that board, the schematic and most of the other
parts).

It doesn't have an edge connector on it like the Bally, but it does have 50
pin header positions for a cable similar to the one used in the Lil' WHITE
RAM.  There is a large rectangular hole in the PCB for a large Capacitor like
the one on the motherboard on the Bally.  It also has headers for the Floppy
drive and keyboard cables.


For an overview of the "Add-Under" read this article called "Michigan Bally
Users' Group gets a Look at Zgrass-32 'Add-Under' for the Arcade!"" by George
Moses and Brett Bilbrey   This was originally published in the Arcadian
newsletter (ARCADIAN, 3, no. 6 (April 15, 1981): 64-64.).

Bally Add-Under PCB - Part Number Bally Add-Under PCB - Part Number
Bally Add-Under PCB - PCB Side 1 Bally Add-Under PCB - PCB Side 1
Bally Add-Under PCB - PCB Side 2 Bally Add-Under PCB - PCB Side 2
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