In a message dated 98-01-07 17:05:26 EST, you write: << I once had a PC/XT overclocked to 25 or so MHz. It caught fire... Basically, I just pulled the chip marked 25 MHz from a dead 386 and put it where the XT's ship was. It took about 10 minutes to start emitting black smoke. This was before I knew they were useful... >> A friend of mine once told me that they used to replace the 1mhz? crystal on Kim-1 boards with an 8mhz crystal. Man, that 6502 was real fast for a while. :-)