For sale is an Apple XC68040FE33M 66/33 MHZ CPU processor module daughter card (820-0559-A) for the Japanese-only PowerBook 550c. Processor model runs a full 68040 with FPU. Although I haven't confirmed this, this would likely allow one to upgrade a PowerBook 540c to a full 68040, bringing it to 550c level performance.

Fast and careful shipping from Tokyo, Japan. Please be aware of customs import fees in your country, however this falls within the duty free allowance for the US and no import duties are due. Also be aware of possible customs delays, particularly in the E.U.

Keep in mind that this is vintage equipment for vintage computers. Very specific knowledge of its era is required. Please carefully check your use situation and software/hardware compatibility. In other words, I’m not your tech support (but am helpful!), nor am I responsible if something breaks during installation.

I ship within 24 hours most of the time, but when shipping falls late on a Saturday in Japan, shipping will not be until Monday.