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Have you looked at https://hackaday.io/project/8473-msx-protocard? Based on all the information already provided, you may be able to expand the project and do a lot more with it. Check it out! Keep us posted. Twitter: @msxall


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The mysterious "T" is CPU clock tick, as mentioned above, and it figures as a "non-dividable time quantum" on this computer. When you need to do something with perfect timing (e.g. audio generation), you had to compute how much ticks your routine takes (each instruction takes a known amount of T). It is very painful, but because ZX Spectrum has no HW timers, ...


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