I recently tried programming a 12C509 using P16PRO on a 386/25, with a DT-100 programmer and the results showed some verification errors. Bits programmed as zero when they should have been a one. I tried again on a 486/100 and the problems went away. Both attempts using MS-DOS booted from floppy. I want a Linux based 12C50x programmer. With source. Under $40USD. -- James Cameron (cameron@stl.dec.com) Digital Equipment Corporation (Australia) Pty. Ltd. A.C.N. 000 446 800