Introduction

This is a companion board to my EPROM Emulator NG (see my other shared projects). With a few solder bridge jumpers, you can configure this PCB is to perform one of the following functions:

• use my emulator or a 28 pin EPROM memory like the 2764-27512 in place of 2364 ROM commonly used in Commodore 64 or VIC-20

• use my emulator to emulate 24 pin memory like the 2716 or 2732 (the emulator can do it with the default 28 pin adapter, but power has to be provided externally, this PCB solves the issue).

Since the minimum order is 5 PCBs you can create yourself a set of useful adapters.

How to assemble.

1. Configure the PCB for either 2364 support or 2716/32 support

In this example, I soldered all the bridges on the left-hand side to configure the board to support 2716/2732 memory.

2. (optional) If you are using the PCB as a 2364 to 2764 adapter you can solder the pull-up resistors for line A13-A15

note: if you are using the adapter with my emulator those pull-ups are not required as the emulator has those built-in.

3. Solder the 2x 12 pin headers.

To help with the soldering process, I insert the headers into a breadboard before soldering:

Pay extra attention as you insert the pins into the PCB, the 2x 12pin headers should be on the left set of holes!

4. Trim the right-hand-side header after soldering to create space for the 28 pin socket

5. Solder the 28pin socket

6. Your new adapter is ready to use.