Twiggy 128K prototype, again.

[Gorgonops]

Looking at the 5.25" Floppy slot as an additional convection cooling outlet, the box itself as an air dam and producing a chimney effect...

1: Both the top and the bottom of the Twiggy drive are nearly completely impassible. The bottom is a solid casting and a full-size circuit board covers the top. There's very little room for air to circulate through the drive mechanism, so if your theory is that the box is designed to chimney hot air from the motherboard to the front of the system *through the drive* it's not going to be very effective at that. Further, only a fool would intentionally design a computer to draw air through the floppy drive. I've been inside plenty of cases where that happens unintentionally and said machines inevitably suffer badly from having their floppy drives clogged with dust.

2: I'm confused by your "chimney effect past the AB" statement, since... how would that box do anything to facilitate that?

When asked a question about whether his cigars represented, according to his own theories, some sort of oral/sexual fixation Sigmund Freud is famously reputed to have replied: "Sometimes a cigar is just a cigar.". Sometimes a box is just a box. Drive needed shielding, drive got shielding.

 

[jsarchibald]

Surely there are pictures of these prototypes in archives of the corporations that used them to develop software? I honestly can't believe that these companies wouldn't have taken the machines apart and taken some photos of them due to the revolutionary aspect of them. Someone somewhere would have more photos of these things back in the day that we could compare this one to. I still think that Andy Hertzfeld would be able to tell you if this one is legit or not, and answer a lot of the questions we are all asking.

 

[Trash80toHP_Mini]

Looking at the 5.25" Floppy slot as an additional convection cooling outlet, the box itself as an air dam and producing a chimney effect...

1: Both the top and the bottom of the Twiggy drive are nearly completely impassible. The bottom is a solid casting and a full-size circuit board covers the top. There's very little room for air to circulate through the drive mechanism, so if your theory is that the box is designed to chimney hot air from the motherboard to the front of the system *through the drive* it's not going to be very effective at that.

Nope, no system air, it's just the tiny bit of cooling air that would slip up and around the Frame/PCB that would carry the negligible amount of waste heat produced by the TwiggyDrive out the 5.25" slot.

2: I'm confused by your "chimney effect past the AB" statement, since... how would that box do anything to facilitate that?

Think of the box is an open bottom diving bell, trapping the waste head from the Twiggy in the (albeit miniscule) sea of air vented through the underchin intake vents of the ProtoMac case. The Box all but abuts the right side of the case and frame, so no cooling air to speak of takes that route. The 'diving bell" acts as an air dam, such that the front vent intake's air stays down in the MoBo cellar picking up the MoBo's heat output and traveling back and to the left side of the case underneath the warmer air inside the Twiggy enclosure. Only these two routes remain for the cooler air to travel as it picks up waste heat and expands up and to the left, past the AB where it picks up more heat from the AB components in the (4" tall ?) space between the "diving bell box" and the component side of the AB's PCB. The other path for convection would be straight back underneath the "air dam/diving bell" and up the backside of the "diving bell" where it would cool the yoke assembly of the CRT.

It ain't enough, but if that's what the "packaging" mechanical engineers chose to do on purpose, it was pretty slick. My local lil' bro does blade server packaging for TekElec, he likes playing with fluid dynamics and heat sinks. He says convection is fine until you start having fans blowing air all around the inside of a computer case. Convection is out the window in Gamer Boxes and the like.

With a very small fan mounted in the handle space, a whole lot of grief could have been avoided by giving convection a little pull along!

 

[barana]

My thoughts?

im a member of the google groups lisalist.

Xenix was an operating system ported to the lisas by microsoft, dd is available on xenix. If you could get an early version of macos on a twiggy lisa, you could image it.

there are a few lisa owners with this combo...

oh and another thing, iirc the twiggy drive used a piece of foam on the other side of the drive head to exert positive pressure of the disk surface to the head (twiggy drives had drive heads for both sides on opposite ends of the disk. IF that foam is perished =very likely, then no pressure means no disk reading! = that twiggy disk may have <.85 system on it! hard to say unless a hacker minded collector buys it.....

or storms the guy whos selling it's house and steals it via gunpoint....

for a very rough timeline of sys versions, see here

http://www.folklore.org/StoryView.py?project=Macintosh&story=Early_Demos.txt&sortOrder=Sort%20by%20Date&detail=medium

 

[barana]

i believe this system is the #6 or #7 or in between that andy describes here http://www.folklore.org/StoryView.py?project=Macintosh&story=Macintosh_Prototypes.txt&sortOrder=Sort%20by%20Date&detail=medium

due to the date on the board, the non matching serial number, and the presence of mr macintosh

note this pic, http://i.ebayimg.com/t/BEYOND-RARE-PROTOTYPE-MACINTOSH-128k-APPLE-MAC-5-25-TWIGGY-DISK-DRIVE-/00/s/ODcwWDYyMg==/$(KGrHqR,!nQE9gF4Zen9BPhvO7Nv9Q~~60_58.JPG

where the analog sound generator chip (ASG) is present

 

[Gorgonops]

I honestly can't believe that these companies wouldn't have taken the machines apart and taken some photos of them due to the revolutionary aspect of them.

Considering the undoubtedly draconian terms of the non-disclosure agreement that pre-release developers certainly must have signed to get their paws on a Mac prototype in the first place disassembling it and taking pictures would have been an extremely stupid thing to do from a legal standpoint.

 

[barana]

only if the photos got out 'too early'

20yrs is an ok time to let them out.

 

[Mk.558]

I don't think those non-disclosure agreements expire like that.

Ask Apple, Foxconn, or the scores of many other companies that (sometimes rightfully) use NDAs like it's going out of style if they ever plan a "sunset" date into them.

 

[BGoins12]

It seems that someone has bid on this. :O

 

[Concorde1993]

It seems that someone has bid on this. :O

Yeah, and the bidder basically has nothing for feedback. So expect this prototype to be on eBay a little while longer.

 

[BGoins12]

Yeah, judging by his last bids (pocket knives, PDA/Cellphone batteries), it just sounds like someone that is screwing around.

 

[sirwiggum]

There are prototypes of everything floating around.

ATM there are prototypes of Wii U, there are presumably PS4, XBox720, iPad 4/Mini etc. prototypes.

But the NDAs prevent any details getting out, anything that is reported is rumour / PR or someone leaving something in a bar...

 

[tt]

So expect this prototype to be on eBay a little while longer.

Re-listed...

 

[uniserver]

i think the seller is holding out for MAXIMUM ROI!

lol

 

[LCGuy]

Just a reminder to everyone from your friendly administration team to please refrain from making derogatory comments about the seller or the price they want for it, regardless of your opinion on either topic.

 

[BGoins12]

Relisted auction is now gone. Odd.

 

[Dennis Nedry]

I certainly wouldn't publicly mention or post pictures of an Apple prototype that I had in my possession, let alone try to sell it on eBay! Foolish - it could be taken away from that person. I'm glad we got to see it though.

 

[barana]

so, as i undrstand it, The difference this particular mac makes is =

the twiggy drive

the possible(but atm doubtful)early system rom

and the front cover to facilitate the twiggy drive

im a solutions type of hacker so....

we have twiggy disk drivers in LOS, and lisaem, and possibly the other lisa emulator i cant remember

it would take a little hacking around to make twiggy drivers, but we really have references and code available to us.

they could easily be injected into a system rom and a new one burnt.

heh u could even compile ur own rom and use it in the fpgamac project.. for something different (and closer to a 512k config without going upto a mac+- scsi and extra stuff)

The twiggy drive is a little harder, but we could find the last and best revision twiggy and reproduce one properly with a reprap.

(a 3d printer that can be built by anyone) the circuitry and motors and such are large enough to be replaced with other similar items.

the lisa 2/5 twiggy adapter can be c0pied and reproduced as well.

as for the front cover, well either someone could reproduce one from a the photos and positioning a real twiggy in a mac case, a 3d modeller would be able to do so.

so for some who would like to fiddle with a twiggy mac, there is a real possibility

as well as the extra storage space that the twiggy provides = 900ish kb to a disk comparted to 400kbish.

aslo as a side thought, would there be anything wrong with connecting an idefile/xprofile card to a pre 512ke mac?

alls that needed is a paralell card and some drivers... just thinking here.

 

[tt]

Sometimes the even more rare items slip right past us without notice ("lefty" floppy prototype case): http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&_trksid=p4340.l2557&rt=nc&nma=true&item=170824312850&si=oeaBgfrohgJrml%252BMaHtVzMQJHgM%253D&viewitem=&orig_cvip=true&rt=nc#ht_500wt_1387

 

[Trash80toHP_Mini]

As noted here on the fora previously:

For sale is a 1984 original, first manufactured macintosh computer (model:M0001 (128K)) built by Apple. It's in great condition (it works as if it were new). Included the original monitor, keyboard, mouse, and printer. It's a very rare collectable. The pictures are inverted because I don't have a camera so I used my webcam. The escape key is missing.

[] ]'>

I've been planning to make a vacuum forming buck for doing a ProtoHoaxMacTwiggy™ in clear plexi since the Old Guard day over on 'fritter. However a DVD/CD will be popping in-n-out of the opening. Learning about the stamped aluminum "skin" on the Twiggy drive makes this just too easy! [] ]'>

I've got plans on the board for doing a total of five riffs on different ProtoHoaxMac™ Hacks. Vacuum forming plexi convex CRT faces and concave inner bezels to frame LCDs behind 9" and 12" CRT openings is the next development step in this ongoing project.

Old school pattern making, vacuum forming and plexi fabrication techniques trump CNC & ProtoPrinting processes when it comes to clear ProtoHoaxMac™ production in very small quantities . . . not to mention the monetary hit imposed by taking a high tech approach.

Plaster cast of positive part = female cast for positive blank -> shave down positive blank by the thickness of the plexi being formed ->

vacuum forming sections -> trimming formed blanks -> machining Snow White grooviness -> assembly

Lightly frosting the inside of the blanks, by sandblasting, covers a multitude of sins, like the (manual, not CNC) router table bit's machining marks, BTW. [] ]'>