![]() Nintendo made five revisions of the Power Board circuit, which are labeled FMD-POWER-01 to FMD-POWER-05. It also carries all of the data and control signals from the RAM Adapter connector on the back of the unit to the Mitsumi drive mechanism. As the name implies, this circuit board supplies power to the drive mechanism either from batteries or the AC adapter, it contains an electronically switched 2-way power supply which redirects power from any of these two sources to the drive motor at the RAM Adapter’s request. The well-known Drive Controller Chip (either FD7201 or FD3206) resides in the drive mechanism on the right. The Famicom Disk System unit consists of two main parts: The custom Mitsumi 3″ Quick Disk drive mechanism on the right, and a Printed Circuit Board on the left which we will call the Power Board from now on. This little-known fact has caused many frustrations among Famicom enthusiasts who own a FDS with a 7201 drive chip, built an FDSLoadr cable and then wonder why they can’t get the disk writing part to work, when everything seems correct.įirst off, let’s take a look inside the Famicom Disk System drvie (HVC-022): Inside the Famicom Disk System drive What is not widely known, even inside Famicom collector and technical circles is that there is another copy protection measure inside Famicom Disk System units besides the drive controller chip. The FD3206 is an improved version of the 7201 which forbids you from rewriting the entire Disk Card. ![]() The FD7201 is the first release which doesn’t contain any copy protection feature whatsoever. It is a well known fact that Nintendo made two revisions of the drive controller chip inside the Famicom Disk System 3″ drive.
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