Timmerman "Shrapnnel-Knobben" mod

[Peter McConnel]

what would be the effect of using a different voltage zener in this
mod??also which wattage zener is recommended?

Jorgen Karlsson Wrote: "Cut the signal pin, replace it with a 470ohm
resistor, on the motherboard side of the resistor solder the 4.7v zener
diode to the ground pin. The circle around the diode (if any) should be
towards the resistor."

thanks,

Peter McConnel
'87 5kcstq 193k