On my website there are finally pictures from some prototypes:
Philips VG-8240
Philips NMS 8260
Philips VG-8230 prototype
Philips slotexpander
Philips Single drive
http://www.msx.bas-ditta.info/images/prototypes.htm
To see the webiste: www.bas-ditta.info
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It all has a very DIY feeling to it, doesn't it?