I think I have to disagree with you on that, I'll post some pictures of them all side by side as soon as my other board arrives, but I've looked up a lot of pictures of these machines and the 7300 is the only one with the 24pin connector in any of the ph
if you have an unmolested 7200, 7500, or 7600 and you pop it open I'm very confident your going to find the 22 pin 90 degree connector and only the 24pin straight on on a 7300. Not that google is proof, but if you google 7300 and look at the photos they all have that straight 24pin connector vs the other style.
this 7500 board is a 24pin connector
Your statements are inconsistent. If your '7500' has a 24 pin connector, then clearly the 7300 is not the only one with a 24 pin connector.
So, how did there come to exist what looks like a 7500 board with a 24 pin power connector? One possibility is that it is a 7600 logic board.
I have some small uncertainty regarding the 7600 and it's power supply connector, but if you have what looks like a 7500 board and it has half of the video chips on-board (as opposed to 8500 with all or 7300 with none) and a 24 pin power connector, then I'm fairly certain that's a 7600.
There was no other difference between the 7500 and 7600. They didn't change the ROM. They didn't change the chipset. They didn't change expansion connectors.
The only thing that changed between the 7500 and the 7600 was the power supply connector.
Then on the 7300 they eliminated the video In (out? can never remember which the 7500/7600 had) and the ROM changed to the same as the original 8600/9600.
The 7300, and both versions of the 8600 and the 9600 all use the 24 pin connector.