P'N'P CHip.......HaHa,.....This schematic dates to a time before PNP was anything other than a type of transistor. When you programmed this puppy you were free to go right to the hardware. Goodness knows we got to run those programs under the likes of PCDOS 1.0 and MSDOS 2.1. Both very wonderful environments that could boot off floppy in 18 seconds!!! my god that was fast compared to reading in 8K basic off a 950 inch spool of mylar tape!

Michael Karas