ballytablewiz
Well-known member
Radar Scope PCB, with a catch : It's been converted to play DKJR!?!
So we all know that Radar Scope's were famously converted into Donkey Kong's. And some also know that DK and DKJR share the same VIDEO PCB, and much of the same TTL logic. So obviously some crafty operator BITD had a Donkey Kong that he wanted to play DKJR on, and he made some modifications to this PCB to make that happen...
I got the board as a sort of basket case, missing interboard connect cables, missing CPU, and boards separated in a pile. It was labeled as a DKJR, which I found odd. I also noticed some curious work had been done, namely that a couple of the EPROMs on the CPU board had others stacked on top of them, soldered into sockets on top of the existing chips. And some legs of a few ICs have been desoldered, lifted, and tracer re-routed into new circuits. I was scared. Upon closer inspection, the modifications appear professional and have been done very carefully, not damaging the board or chips involved. So I loaded it up with a fresh new CPU, slapped some interboard cables on it, and fired it up. It friggin' WORKS! It plays Donkey Kong Jr!?!
Now, the audio isn't playing music, only a couple simple sounds for walking and jumping. I don't know if this conversion was meant to play music (is DK/RS hardware even capable of playing DKJR sounds and music, since JR used some different audio hardware?), or if something is awry. I also don't care.
This PCB could be de-converted back into a Donkey Kong (which it WAS at one time, because some of the EPROM labels can be seen to show TKG's), or you can take it all the way back to a Radar Scope. The EPROMs on the VIDEO PCB have Radar Scope (TRS) labels on them, I assume they have been erased and reburned into JR code, but there they are. An average tech could take on this deconversion - I could easily do it - but again, I just don't care. I have no desire to own or play a Radar Scope, and I'm not investing in a PROM set and reburning the EPROMs to make it into a board I don't care about. I did my share just finding, reconstituting, and getting it back to living status
My testing has proven that we have a working CPU, VIDEO, and CLK boards, the SOU board's health cannot be determined in it's current form. The original pots are in place on the (unmodified) CLK board, one of them is missing the plastic knob, but works with a screwdriver. The other (V-Pos) pot is super touchy, could probably use a replacement.
This board is sold AS-IS, I will not help you with it nor accept it back in return.
*SOLD*
.
So we all know that Radar Scope's were famously converted into Donkey Kong's. And some also know that DK and DKJR share the same VIDEO PCB, and much of the same TTL logic. So obviously some crafty operator BITD had a Donkey Kong that he wanted to play DKJR on, and he made some modifications to this PCB to make that happen...
I got the board as a sort of basket case, missing interboard connect cables, missing CPU, and boards separated in a pile. It was labeled as a DKJR, which I found odd. I also noticed some curious work had been done, namely that a couple of the EPROMs on the CPU board had others stacked on top of them, soldered into sockets on top of the existing chips. And some legs of a few ICs have been desoldered, lifted, and tracer re-routed into new circuits. I was scared. Upon closer inspection, the modifications appear professional and have been done very carefully, not damaging the board or chips involved. So I loaded it up with a fresh new CPU, slapped some interboard cables on it, and fired it up. It friggin' WORKS! It plays Donkey Kong Jr!?!
Now, the audio isn't playing music, only a couple simple sounds for walking and jumping. I don't know if this conversion was meant to play music (is DK/RS hardware even capable of playing DKJR sounds and music, since JR used some different audio hardware?), or if something is awry. I also don't care.
This PCB could be de-converted back into a Donkey Kong (which it WAS at one time, because some of the EPROM labels can be seen to show TKG's), or you can take it all the way back to a Radar Scope. The EPROMs on the VIDEO PCB have Radar Scope (TRS) labels on them, I assume they have been erased and reburned into JR code, but there they are. An average tech could take on this deconversion - I could easily do it - but again, I just don't care. I have no desire to own or play a Radar Scope, and I'm not investing in a PROM set and reburning the EPROMs to make it into a board I don't care about. I did my share just finding, reconstituting, and getting it back to living status
My testing has proven that we have a working CPU, VIDEO, and CLK boards, the SOU board's health cannot be determined in it's current form. The original pots are in place on the (unmodified) CLK board, one of them is missing the plastic knob, but works with a screwdriver. The other (V-Pos) pot is super touchy, could probably use a replacement.
This board is sold AS-IS, I will not help you with it nor accept it back in return.
*SOLD*
.
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