Foreword

This printed circuit board (PCB) implements the MOS 6510/8500 CPU adapter circuit for Commodore computers that use a MOS 7501/8501 CPU, designed by Andrew Challis. Please consider supporting Andrew's work and purchasing from him if possible; his eBay listings and website are listed below.

• https://www.ebay.co.uk/sch/hackjunkcom/m.html
• https://hackjunk.com/2017/06/23/commodore-16-plus-4-8501-to-6510-cpu-conversion

The PCB has been designed to be as small as possible (for through-hole component use) and also exposes/breaks-out the A14 and A15 CPU address lines. These two address lines are often connected to 64KB Commodore 16 memory expansion projects.

If you are unfamiliar with how this adapter works or its limitations, please review Andrew Challis' website linked above.

Overview

This product listing is for one (1) fully assembled CPU adapter module. The 6510/8500 CPU is NOT included. The optional modified kernal EPROM is NOT included. The socket for the 6510 is of the machined/precision variety, as are the round male header pins (for insertion to the main board). I have verified that these round pins will install into both the single-wipe and double-wipe socket; the factory-installed socket is likely of single-wipe variety.

The provided photos depict the fully assembled module, a bare PCB, and an example of a fully assembled module with 6510 CPU inside of a Commodore 16 computer. All solder joints have been inspected for tidiness and cleaned of excessive flux, and the module was tested by ensuring proper continuity between all male and female pins.

Installation Notes

Each of the computers in the Commodore-264 series (16, Plus/4, 116) has different clearance between the system board and the bottom of the keyboard, so please evaluate your situation carefully prior to purchase. I have only verified this adapter to install to the factory CPU socket of a Commodore 16, with a 6510 CPU installed in the socket of the adapter PCB. In this configuration, the RF shield makes contact with the top of the 6510 CPU. It should install into a Plus/4 or 116 by removing the factory installed CPU socket on the system board (noted on Andrew Challis' web site above). The module overhead is approximately 10mm, measured from the top of 6510 the socket to the male pin-header mating surface (black plastic above pins).