Then you've got the S-100 bus systems of the mid-late 70's where nearly every single one of them was modified to some extent or another just due to the fact that it was something that needed to be done to get any kind of functionality out of it. Both my homebuilt S-100 machine and my SWTPc 6809 were added to over the years. Sometimes 'hot rodding' was just the nature of the beast and an everyday part of being a computer hobbyist at the time. I don't feel that period modifications are any less valid a configuration than a fresh factory machine and sometimes even more desirable because of how unique they can be. Jeff