Hello Myke.

> I'm in the midst of redesigning it to use transistors instead of the
> Opto-Isolator as this will allow easier building of it and allow more
> robust programming of EPROM parts.

  I'm not surprised.  What was the purpose of the opto-isolator in the
first place?  Why did it need high-voltage isolation?

>  The design will require a P-Channel MOSFET.

  Hmmm.  Why a FET?  Why not a transistor?  What specs?

  Perhaps you could point me to your YAP web page for elucidation?
--
  Cheers,
        Paul B.