The 7600 and 8600 use a different power supply from the 7500/8500, IIRC.
The 8500 and 8600 include a couple of extra chips for the video capture or maybe that was video export. The 7500 and 7600 do either import or export, I can't remember which. The 8500 and 8600 do both import and export.
The 7500 and 7600 motherboard have the positions on the circuit board for the extra chips which the 8500 and 8600 actually have on board, so they're the same raw boards, simply populated differently.
The 7300 and the 8600 have a slightly updated ROM, $77D.34F2 instead of $77D.28F2. The 7600 also has the 28f2 ROM. On the boards, the four 28F2 ROM chips are labeled 341S0169 through 341S0172. The 34F2 ROMs are labeled 341S0280 through 341S0283.
The 8600 enhanced and 9600 enhanced (Kansas/Mach V machines) have yet another ROM, the $77D.34F5, which is labeled 341S0380 through 341S0383.
The switch from 8500 and 9500 to 8600 and 9600 moved virtually the same motherboards (updated power connector and ROM) into a nicer case. The update to 8600 and 9600 Enhanced kept the nice case and added the later ROM and ability to use the Mach V CPU cards. Also, the 9600 Enhanced lacks the on-board L2 cache found on the 9500 and 9600 boards, but the positions for the chips are still there, but unpopulated.
The 7300 also did away with the video import/export ability altogether.
Jeff Walther
The 8500 and 8600 include a couple of extra chips for the video capture or maybe that was video export. The 7500 and 7600 do either import or export, I can't remember which. The 8500 and 8600 do both import and export.
The 7500 and 7600 motherboard have the positions on the circuit board for the extra chips which the 8500 and 8600 actually have on board, so they're the same raw boards, simply populated differently.
The 7300 and the 8600 have a slightly updated ROM, $77D.34F2 instead of $77D.28F2. The 7600 also has the 28f2 ROM. On the boards, the four 28F2 ROM chips are labeled 341S0169 through 341S0172. The 34F2 ROMs are labeled 341S0280 through 341S0283.
The 8600 enhanced and 9600 enhanced (Kansas/Mach V machines) have yet another ROM, the $77D.34F5, which is labeled 341S0380 through 341S0383.
The switch from 8500 and 9500 to 8600 and 9600 moved virtually the same motherboards (updated power connector and ROM) into a nicer case. The update to 8600 and 9600 Enhanced kept the nice case and added the later ROM and ability to use the Mach V CPU cards. Also, the 9600 Enhanced lacks the on-board L2 cache found on the 9500 and 9600 boards, but the positions for the chips are still there, but unpopulated.
The 7300 also did away with the video import/export ability altogether.
Jeff Walther