> If the new one chip msx comes out you can connect the hardware tru usb maby
> that wil work also on usb from a pc ro ?????
In an emulator, it is possible to freeze the MSX until whatever acts like a
cartridge responds. On a real MSX, there are strict timings and I don't think
USB can make those deadlines.
By the way, even disregarding latency and only looking at bandwidth, I think
USB 1.0 is not fast enough. When executing code from a cartridge (running a
game ROM), there will be a merory read about once in 7 cycles (rough
estimate). At 3.5 MHz that is 500 kilobyte per second. USB 1.0 has a
bandwidth of 2 megabit per second (correct me if I'm wrong), which is 250
kilobyte per second. This is disgarding any overhead of the USB protocol and
disregarding the fact that the address being fetched should also be
communicated, so the actual number will be even lower.
USB 2.0 is said to be a lot faster, but this higher speed can only be
delivered under certain conditions. I think USB 2.0 will have enough
bandwidth to act as an MSX cartridge, although you might need a dedicated
cable with no other devices attached. However, I guess the latency will still
be too large to allow this solution to work on a real MSX.
Bye,
Maarten
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