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Provides an up-front evaluation of performance versus objectices via README.MD.

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@ -57,6 +57,11 @@ A corollary of emulating the continuous nature CRT, not merely performing end-of
## Accurate Emulation
Cycle-accurate emulation for the supported target machines is fairly trite now; this emulator seeks to follow that well-trodden path. All emulation logic is written in C++ for explicit control over costs but, where a conflict arises, the presumption is towards clarity and simplicity of code. This emulator is willing to spend the processing resources available on modern hardware.
Cycle-accurate emulation for the supported target machines is fairly trite; this emulator seeks to follow that precedent. All emulation logic is written in C++ for explicit control over costs but, where a conflict arises, the presumption is towards clarity and simplicity of code. This emulator is willing to spend the processing resources available on modern hardware.
Which are polite ways of saying that it's generally slower than the standard bearers for each supported platform but that if it's comfortably within the processing ability of a semi-modern computer then that's not considered problematic.
Self-ratings:
* the Electron, Oric and Vic-20 are pretty much perfect;
* the ZX80 and ZX81 are very strong;
* the Amstrad CPC has known accuracy deficiencies in its 8272 and 6845;
* the Atari 2600 has some known accuracy deficiencies in its TIA;
* the C-1540(/1) is locked in reading mode and doesn't yet support writing.