need external power supply (stabilized). Use only one resistor. Connects to serial port and programs PIC 16C84
http://www.jdm.homepage.dk/easypic.htm
by David Tait. Connects to parallel port. Circuit diagram, copper layout and programmign software for DOS and Windows
http://www.bobblick.com/techref/projects/picprog/picprog.html
http://www.qsl.net/vu2upx/Projects/extralow.htm
with 12C50x and EEPROM 24Cxx
http://www.geocities.com/mpu51/jdm84/JDM2001_SCH.pdf