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[ried]

Here's a unit from former Apple demo software developer Pete Burnight: https://www.applefritter.com/content/yet-another-twiggy-mac

It's going up for Auction at Bonhams later this month: https://www.bonhams.com/auction/29514/preview-lot/5918785/apple-twiggy-macintosh-prototype-used-in-the-development-of-demonstration-software-macintosh-personal-computer-apple-computers-inc-cupertino-ca-1983-with-5-14-inch-twiggy-disk-drive-with-corresponding-slot-in-front-panel/

Unknown whether it's working or not. I understand the Macintosh Twiggy drive has a slightly different pinout vs. Lisa's Twiggy drive. Still, I suspect it could be made to work if the right folks got their hands on it.

[anotherLISAguy]

noticed the keyboard wasn't plugged into the front keyboard location - for a prototype, it seems odd to have the final incarnation of the front completed and route the cable around the back.
Even in this earlier 2020 auction, the molds show the final location so it wasn't an afterthought during the prototype phase.
(interesting to note that there is another Twiggy Mac in waiting with that serial number)

https://www.bonhams.com/auction/26078/lot/71/apple-macintosh-evolution-group-of-3-original-molded-plastic-faceplates-apple-inc-1983-1984/

[ried]

Good eye. I suspect that keyboard cable isn't plugged into anything back there and it's just been routed that way because the photographer didn't want to risk damaging it by plugging / unplugging anything.

Just a guess.

[ried]

It sold, but only achieved the opening bid of $65K + buyer's premium = $83K in total. The market has definitely cooled.

In any case, Pete Burnight kindly sent me a photo of the rear. Here it is:

[anotherLISAguy]

seems the only diff back there is the final location of the printer and modem ports. (with no keyboard port)

[ried]

Thought folks might like to see the Twiggy Mac's prototype mouse. It's an interesting Lisa / Macintosh hybrid design:

https://imgur.com/a/uJhHunT

The only other one that I am aware of was photographed and shared here over at the 68kMLA forums:

https://68kmla.org/bb/index.php?threads/a-bit-of-a-rarity.36020/page-2#post-388814