The F-51 has Three boards: the digital and analog electronics board, And the front panel board. The first board was the processing unit. And the first chip was yamaha YMW830-V, Processor and tone generator in a single chip.
•Yamaha YMW830-V: Processor and tone generator (IC101)
•Winbond 25Q16JVS1M: 16Mbit Serial flash memory (IC102)
•74VHC273: 8-bit latch for display data (IC301)
The YMW830-V is also known as “SWLL” and is a Yamaha proprietary system on a chip (SOC). The F-51 has separate amplifiers for the speaker (IC701) and headphone output (IC601):
•TI TLV74333PDBVR: 3.3V regulator (IC001)
•TI TPS63060DSCR: Switching regulator (IC004)
•TI 12V eFuse: 12V eFuse/power switch (IC006)
The F-51 must choose and switch between +12V adapter power and battery power. That’s the role of the eFuse/power switch component
The YMW830-V has many of the specs that I’ve come to know about Yamaha’s entry-level CPUs. The external crystal resonates at 16.9344MHz. The YMW830-V internal clock is 33.8688MHz and generates a 67.7376MHz master clock. If these numbers look odd to you, simply note that they are even multiples of 44,100Hz, the basic sample rate:
67.7376MHz = 44,100Hz * 1,536
In Video I said YMV380-V By Mistake It Is YMW830-V.