This thread related to
Probably this simple way to create the DC-DC converter.Since no NE555 as step-up converter.
Cause the HVPP/Parallel programmer only need HV(11.5-12.5 VDC) and required small current only.
As replacement for MC34063 for AT89X programmer with "USB"(only 5 VDC from USB for power supply).
Above picture is NE555 DC up converter.
Micro-CAP didn't had MCU simulation,So I used on NE-555 and Signal sources to replaced the MCU.
Did someone also already made this DC up converter ? Any info will be appreciated.