How do the following values relate to actual emulated speed of a system being emulated:

cycles=X
cycleup=y
cycledown=z
x, y, z, = any numeric value

Possibilties:
1. A specific cycle number setting determine system speed being emulated. For example, x = 500, y=100, z=20. Then system would then run at the Speed of an 8088 (XT) @4.77Mhz. Or x=3000, y=1000, x=200. Then system would then run at the speed of an 286 (AT) @ 12Mhz.

2. x,y,z value always represents a fraction of actual speed of host system. For example x=7000. On a PIII 900MHz, the system becomes a 386 33Mhz. On a P4 2GHz, the system becomes a 486 66MHz.

3. Something else?

Additionally, is there a specific Ratio amoung the three values of X, Y, Z. Should Y and/or Z always be a specific precentage of X?

In regards to scenario 1. If it is true, does anyone have a table for the specific values of x,y,z to properly match the following systems: Tandy 1000TX, 286 ranging between 16-20MHz, 486 @ 66MHz, Orginal Pentium @ 100MHz.

In regards to scenario 2. If it is true, does anyone know or have a conversion (or close to) for values X,Y,Z that would properly emulate a Tandy 1000TX, 286 ranging between 16-20MHz, 486 @ 66MHz, Original Pentium @ 100MHz, on a P4 2.8Ghz system?

Thanks In Advance For Any and All Responses,
Trebor