Placing 2716's EPROMS in to replace your factory ROMs.
(c) Ken Deel/OtherWorlds Unlimited

Look at the bottom of the schematic for your CPU board. Something like this from the MPU-1 board should show.
At the 2716 column, it says "Cut & Strap 1" atop the column. This "1" is important. I am going to refer to these numbers as the "EPROM setup number".

So in this instance we will be looking for "1's" in the circuit schematic to know where to jump/Strap and where to cut.

2716's are easy to come by and Marco Specialties carries them "Used" which from my experience is as good as new.

Below showing the MPU-1 board (Sharp Shooter and Super Nova to name two that use an MPU-1);
Print a separate copy of the schematic, locate the traces with the corresponding number and circle them.
This will help them to be easy to find when your ready to work. How to read what your seeing:
The red circle to the left shows that this trace handles rom setups 1, 2 & 3,
while the one circled to the right is a mod only for EPROM setup 1.
The "x" means the trace is supposed to be "cut" for those EPROM setup numbers.

In some case like I did you can make a table to help you go through this painstaking process smoother a bit.

That is to map it out with words, watch what pins and what parts the circuit traces too. This will make it easier for the next part:

Actually trying to find your way around the board itself.

The places where you cut are actually marked... not the way we would prefer, but it is better than nothing.
(shown below)
Use the marked spots to jump and cut your PC board. So if you see a cut where it shouldn't be you will need to jump it here.
And of course jump across the cut when needed.

Start out marking the board underneath where ALL jump/cut markers are shown. maybe circle it with a
red market, to make it easy to find. You have to find ALL shown in the schematic. Or else!

NOTE: It is not the scope of this document to tell you how to work on a PC board, or teach basic electronics.
I'll just say to use a 15w low wattage soldering iron, a small gauge wire maybe necessary to "jump" the cut circuit,
sometimes trying to create solder bridge to connect it will not work all that well and start to damage the PC board.
An Exacto(tm)  knife is what I used to cut the trace. Although the one shown below was already there.

What I used as a jumper wire was a stranded wire piece from some 14 gauge wire.
Tinned it first with solder. (coated with solder) then connected it.
The wire needs to be small so it deson't take too much heat to solder in place and doesn't lift the board traces too easy,
whcih is common when a more bulky wire is used on the fragile pc foils..

What makes this hard is that as you see NONE of these marked traces are marked with an identifier, so it will take some time to trace and find what.
Sometime soon I may have a complete step by step, but not until I go back to work on my Super Nova which is going to get some 2716's.

Soon...