@Roolandoo@SaffronCR There is no Server! The entire emulator is ONE html file that runs completely on the client machine. The only server funcionality is the "session lobby" for the NetPlay! feature, for people to "meet" and enter the session.
@mori0091 Yes, you have to use waits. WebMSX does not emulate the VDP access timing precisely, which OpenMSX tries to. The specs are very short on this, but the need exists.