What exactly are the voltages? They need to be between 5.0-5.2VDC and 12.0-12.3VDC ish.
As long as they are EZ Trak DX machines, the motherboards and hard drives will be compatible. At most, you will have to re-install the software and select the proper machine (2/3 axis, style pendant, etc) it will at least get you in the right direction.
The OEM for the older Bridgeport CNCs (EZ Trak, EZ Path, Explorer, etc) is EMI out of Pennsylvania. We are a distributor for them. Here are the part numbers and prices for what you mentioned.
Hard drive 11591326 #165.00 (if you order this without the software, it will come empty with no OS installed.)
Software for EZ Trak 001331 $149.00 (This comes with 2 copies of the software. If you order this with a DOM, itll be installed on the DOM)
Motherboard (if your motherboard is integrated into the backplane) 002545 $784.00
Motherboard (if your unit has a passive backplane already) 002544 $670.00
To keep the warranty active on the motherboard, also order the filter 000272 for $46.00.
Most of the time, people just buy auto filters to put on the back of the control cabinet. Do not do this, it does not allow proper air flow through the filter to cool the cabinet. Those filters arent designed for a 12v or 110V fan, but an engine. This can cause huge huge issues.
Jon
H&W Machine Repair