Recent content by mattc

I've done up a schematic of the 834-7739-02, and put in the modifications required to jumper it to a 837-7429-01. All IC naming, and layout matches the 834-7739-02, and all red text is the associated value for 837-7429-01. Please note though, this does not make it 1-1 compatible with a...

Yeah, I saw your slipstream conversion. Awesome job on it as well. I totally agree with you, I can't figure out the logic/reason for why the two rom boards have two separate pins to enable the CPUP chips, when the chips are the same capacity. I was doubting that this would do it as well...

It was killing me to know if this would do it, so I did the conversion myself...... and it worked! I believe my jumper settings in the above table are wonky (my reverses aren't correct after jumper 13 (the CPU and SND bank)). You can see what jumpers I used in my attached pictures. I'll come...

Further more to all of this. I confirmed that the PAL is hooked up identically between both boards, then I confirmed that the connector CNJ does not do anything with decrypted ROMS. So then in the process of elimination I moved on to the 74F139N. This is where things got a bit more...

Here's all the jumper settings in a table I did up today, and their respective JEDEC vs Non JEDEC settings. Seems like you know what to look for, pins 2 and 24 swapping. I got my spiderman board already decrypted, so my board is a blend of JEDEC and non JEDEC settings, which probably really...

I've validated that the new jumpers will have no impact on a Spiderman Conversion (they all set certain pins to vcc, that were previously vcc anyways). So we look to be in luck here. The hookup of the 74F139N has been changed (and minimized due to lack of CPUP2 and CPUP3 on the newer boards)...

oh nice, you did slipstream on a 834-7739-0x? Also, OBJ and SLC roms should be fine, it's more the SND and CPU ones that might be a bit trickier.

You could probably down convert (spiderman to rad mobile) fine, but going up is more difficult. There are two (and potentially one more) big things you will have to do to convert up (834-7739-0x -> 837-7429-0x) - Jumper values don't match for the same jumper (even though you find the associated...