Timing and games

There are several ways by which the videogame can time the production of notes. The following is not exhaustive.

Use Timer A

• Castlevania Bloodlines
• The Punisher
• Shadow Run

Use Timer B

• Ghouls'n Ghosts

User both timers

• Thunder Force II
• Thunder Force III
• Thunder Force IV

Use internal timer based on Z80 clock

• Streets of Rage
• Revenge of Shinobi
• Sonic
• 3 Ninjas kick back
• Dune

Depend on BUSY signal length

These games use an internal timer but are sensitive to the busy signal of YM2610 and show different music speed on Megadrive 1 and Megadrive 2