< Don't forget the S-100 bus was really invented at MITS on the Altair. The mits version of it was not the most compatable version and by 79 it was the most incompatable version. It was a poorly conceived bus and badly organized. The fact that systems worked using it was a result of other vendors efforts to clean it up. Even MITS had to toss in the towel and do an 8800B. The signals on the 100 pin connector are identical to the intellec8I. Allison