How to: Convert a 6800 to a 6502

xcelite

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So I decided to convert my 6800 jumperless pod in to a 6502 and here is how i did it.

Processor board
Step 1: Change the cpu to a 6502A processor
Step 2: Reprogram the eprom with 6502 code (I got mine from a fellow klov'r)
If you decide to use the code with dual 6800 and 6502 in it you must take pin 19 and put it to +5v instead of ground.
Step 3: Remove u12 you dont need it even if you convert it back to a 6800 its not required
step 4: cut the traces that ive circled for you in white. Be careful not to cut to deep, The fluke pods are 3 layer boards the vcc and gnd connections are in the middle
Step 5: Remove R7 (part of the self test circuit)
Step 6: Install the jumpers were you see them i am working on a step by step but you still need a visual of the spot on the trace to cut. be carefull
Note: When connecting the self test make sure pin 39 on the test socket does not make connection i do this buy adding a 40 pin socket with pin 39 cut off of it then remove it when connected to the board im testing

Top side cuts
img2692s.jpg


Bottom cuts and jumpers
img2694ea.jpg


Top side jumpers
img2691j.jpg



I/o board
Simple take about five minuites to do
Step 1: cut the one trace that i circled
Step 2: Install the jumper
Step 3: One jumper you can't see is form pin 1 to pin 20 on u3 or u5
Cut trace
img2688p.jpg


jumper
img2689g.jpg



I am working of a pin for pin instructions. I do have my copy of the schematics but its all chicken scratch and would take a doctor to read it.
 
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no only if you could convert it to a 6809 :p

wonder if you could do a Nintendo's CPU :p
 
Perfect. I've been holding off on doing mine because it had no jumpers. Plus I already have a working 6502 so didn't have a need yet.
 
Enjoy im sure this will come in handy. If possible i need someone to do a high res scan of the 6502/6800 pod labels for me.
 
Update: Its has'nt seem to be a problem so far but there is a pull up resistor that is off the sync line thats missing. A 1k will do fine just attach it across Pin 11 of u6 to 5v
 
Excellent work, great pics. Thanks for sharing. Now if only you had posted this before I shelled out the cash for an actual 6502 pod. :p
 
just wondering if you have found any hiccups since you did this or does everything work OK?
I need a 6502 pod and have a 6800.

I think I'd like to convert mine but wanted to see if you've had any other issues first.

thanks
brian
 
If you're lucky enough you might just have the version that has all the solder jumper locations on the board to convert it. ;)

Open it up and see!
 
I assume if its a jumper able one the jumpers would be on the top or bottom board?

I took it apart and didn't see and on the top or back of the board stack. I didn't sepearte the two boards though to see if there are any jumpers in the middle section.

-brian
 
Ive only worked on one 6502 board since i did this mod. I hav'nt found a glitch yet. I cant say that there isnt one, but if there is i havent found it. Do this at your own risk.
 
Great !

I have a 6502 pod that's not working and a 6800 pod that self-tests fine.

Both have a different layout than this one and what I guess are the jumpers on the edge of the board, all indicated with Wx and white wire bridges.

So, I assume I am very lucky.....

Now is it as simple as replacing the 6800 with a 6502 and changing the Wx jumpers to match that of the 6502 pod ?

All the ICs on the board are identical and even the EPROM has the same version and parts nr. on it.
 
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Not yet to be honest. I have a spare 6502..................somewhere....

Did swap the 6532 with the one from the working 6800 without improvement.

Something else: the manual actually simply lists the correct jumper settings for both 6502 and 6800 setting.

However, on my 6800 pod, at W13 and W14 instead of jumpers there are 55 Ohms SMD resistors....any special reason for this ?
 
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