Yamaha YM2413

The YM2413 was used in many devices, including: • the FM Sound Unit add-on for the Sega Mark III sold exclusively in Japan, that improved the sound quality of all compatible games. The Japanese model of the Sega Master System came with this add-on built-in; • an arcade board design produced by SNK and Alpha Denshi in the late 1980s for a number of their games, including Time Soldiers, Sky Soldiers, and Gang Wars; • the Atari Games Rampart arcade game; • the Yamaha PSS-170 and PSS-270 keyboards in 1986; • the Yamaha SHS-10 shoulder keyboard in 1987, and the Yamaha PSS-140 and Yamaha SHS-200 in 1988; • the Yamaha PSR-6 keyboard in 1988; • several sound enhancement cartridges for MSX computers. It is also built into select MSX2 and MSX2+ systems, and all MSX Turbo R machines, as part of the MSX-Music standard; and • JTES Japanese teletext receivers. ==Variants and clones==

Several variations and clones of the YM2413 have been made. • Konami VRC7 (Also known as "VRC VII 053982") contains a YM2413 derivative, used on the Family Computer game Lagrange Point, as well as on a few redemption arcade machines. It has 6 FM channels instead of 9, lacks the rhythm channels, and has a different set of built in FM patches from the YM2413. While the chip was also known as the Yamaha DS1001, there are no official sources that have referenced this name, however it is labeled as such by Yamaha as an internal code. • There is an undocumented debug mode that changes several inputs, including the ability to dump the chip's FM patches as well as access to three additional channels, however this requires modification to the pinouts, which allowed access to the debug mode at the cost of disabling the internal mapper. Due to changes made to the YM2413-based core of the VRC7, the percussion/rhythm mode is not available at all, even when it has been reenabled. As a result, YM2413 streams using the rhythm channels will become completely inaudible on the VRC7 audio chips. It is based on the UM3567, using the same pinouts and an enhanced DAC output. As with the U3567 and UM3567 chips, a pin-to-pin adapter is required to use the YM2413 sockets. Like the UM3567, the different DAC output will also require the two pull-down resistors of the audio output pins to be removed from the mainboard. == See also ==