|Antonino Scala, a trained motor mechanic also skilled in electronic, has built these prototypes since 1990. Because of this, at this time his SIDcard is known as the earliest one ever.|
He first started of with a SID 6581, on the Plus/4 this worked without an external psu. For the C16 an external psu was required. The last version used the SID 8580, instead. Base address was $FD40. In the beginning, even switched of the plus/4's 8551 to try if it works without TTLs (it's not 100% clear how this line is meant). Addressing/chipselect just required a 74133 and a 7404.
Several users tested the card, then Mizkunaz-Electronik in Oberotterbach was going to distribute the SID-Card once they tested it.
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