Looking for a Depraz mouse.

I know the unit well, I have one. It's the original mouse for my Whitechapel MG1. Of course I want to keep it with that system. Mine is the normal 'computer grey' colour, I am told they came in other colours too. The red ones, with the black switch buttons are said to look like ladybirds (ladybugs across the Pnnd?) Checking the technical manual for that machine, which includes the Depraz application notes, it appears there were 2 versions. The D83/P mouse has a normal quatrature output on a DE9 (yes, they got it right!) connector, pinout being : 1 +5V 2 Y2 3 Y1 4 X2 5 X1 6 Ground 7 Middle button 8 Right button 9 Left button The D83/H mouse has a 5V level serial interace (not at all RS232 compatible, and not an asynchronous interface at all). Basically the 7 signals for the mouse go into a 4021 shift register, the interface being the clock, load and output pins of that chift register. The pinout, again a DE9, seems to be 1 Clock 2 Load 3 Out 4 Ground 5 +5V Do you need exactly this mouse (e.g. as an object in your collection in its owen right), or are you repairing a machine that uses it? In the latter case, just about any TTL-level quadrature mouse will work. Incidentally, if you have the mouse and it doesn't work, I do have schematics (not that it's hard to trace them out!). -tony