supercard + hardware details

howdy hackers! :)

inspired by a recent thread on lemon i have added supercard+ emulation to VICE 
and in the process tried to find some documentation on that hardware (so i 
dont have to guess) - with very little success. i figured out that it is 
basically just a 2k ROM sitting at $1000, plus a 8k RAM at $6000 - and 
implementing just that seems to make it work in VICE (grab the latest svn 
version if you want to try). however, i understood that there is/was an 
additional index hole sensor which is atleast supported by one of the 
copyprograms for this card - i would be interested in any information on that 
one, especially where it was connected to :) (that would save me from 
disassembling the IHS-nibbler in order to find out how it works)

it seems that some people have already collected a bunch of related stuff (you 
know who you are) back in 2006 - but unfortunately only the disk images and 
scanned original docs are "around" on the net, no schematics or any other 
details like that :/ (just for curiosity, i'd also like to know what exactly 
the two "clips" coming from the card were used to, somehow i feel like they 
werent really necessary *shrug*)

so if anyone can provide that info, please feel free to throw it into my 
direction :)

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