My MBP can probably comfortably emulate 150 x 1 MHz 6502s in real time, but your average 6502-based system is a system, not just a 6502, and the Acorn stuff is

My MBP can probably comfortably emulate 150 x 1 MHz 6502s in real time, but your average 6502-based system is a system, not just a 6502, and the Acorn stuff is no exception. There's a lot more to emulating it than just dealing with the CPU. The Master 128 runs at 2MHz. For each emulated microsecond you need to (broadly speaking) do at least 2 CPU updates, 2 VIA updates, and 16 bitmap bits/1 teletext glyph. 24MHz = 24 cycles per emulated µsec :( - good luck even squeezing the video output into that, let alone the other stuff. Rather you than me! (This also ignores handling the FDC, ADC, and ACIA. The devices accessed via the VIA will also take a bit of time to emulate...)