Unlike the [[Commodore 64]] and [[Atari 8-bit]] computers, the MSX standard mandates the same Z80 CPU clock speed (3.579545 MHz, exactly the NTSC color subcarrier frequency) for both PAL and NTSC machines.
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However, PAL and NTSC still have to be taken into consideration when developing a game, as there is less time to do updates at 60 Hz than it does at 50 Hz. :* In games made for 60 Hz, the CPU sits idle for 20% of the time when running at 50Hz. Conversely, games which are * Games made for 50 Hz and which utilise the full CPU can not run properly at 60 Hz.
This is why when developing a game, it’s best to make it targeted for 60 Hz. Then it will be much easier to get it to work at both frequencies.