Deletion of the Twiggy drive in 128K prototyping with substitution of the Sony 3.5" FDD was the root cause of a multitude of cooling/longevity issues for the Compact series.**
Sheet metal enclosure on the Shugart 5.25" Drive Mechanism***** based Twiggy drive created a chimney effect. Blocking all but airflow past the hottest sections of the A/B and Flyback . . . as well as the section behind main connector for cooling the neck board
The Pirate Team renegades who went off to found Radius developed a fix for this omission, restoring design spec convection cooling of the Classic Mac form factor for dissipation of additional heat produced by their expansion cards where convection cooling had been inadequate in 128K as released:
Sony to Twiggy offset illustrates where punch stamped return bend support front bezel was affected. Front vent went unblocked on both sides of 5.25->3.5. raised drive adapter foot. Sony FDD's open high hat adapter cage positioning induced all manner of turbulence to cleaner, design spec convection airflow chimney effects of the Twiggy enclosure. Makes me wondered if at that very late, much too close to release date when SJ finally relented to NIH FDD replacement, the team ever even smoke tested the Sony mod?
TLDL: the rest of TwiggyPix readily at hand, currently missing advert pic. etc. ___________________________________________________________________________________
Twiggy Lisa's front bezel looks far more period correct and pleasing to these very high mileage Mk.I OEM vision components.
Very cool Mini Lisa with Twiggy and ersatz Sony 3.5" FDD inspired SD installation? Real deal for in house use would have been just killer!
pièce de résistance from AppleDesign and the wizards of frogdesign?.
** All IMO based on long study of this specific subject and more than passing experience in airflow dynamics gained from HVAC Ducting, Dust Collection Ducting and Cyclone Separator design and fabrication IRL, sans formal fluid dynamics coursework.
***** You would not believe the flack I got on AppleFritter from Dr. Bob and company in that day for saying the Twiggy Drive in an exploded diagram illustration was a Shugart drive! It was, kinda . . . My GOOD/bad that.
Sheet metal enclosure on the Shugart 5.25" Drive Mechanism***** based Twiggy drive created a chimney effect. Blocking all but airflow past the hottest sections of the A/B and Flyback . . . as well as the section behind main connector for cooling the neck board
The Pirate Team renegades who went off to found Radius developed a fix for this omission, restoring design spec convection cooling of the Classic Mac form factor for dissipation of additional heat produced by their expansion cards where convection cooling had been inadequate in 128K as released:
Sony to Twiggy offset illustrates where punch stamped return bend support front bezel was affected. Front vent went unblocked on both sides of 5.25->3.5. raised drive adapter foot. Sony FDD's open high hat adapter cage positioning induced all manner of turbulence to cleaner, design spec convection airflow chimney effects of the Twiggy enclosure. Makes me wondered if at that very late, much too close to release date when SJ finally relented to NIH FDD replacement, the team ever even smoke tested the Sony mod?
TLDL: the rest of TwiggyPix readily at hand, currently missing advert pic. etc. ___________________________________________________________________________________
Twiggy Lisa's front bezel looks far more period correct and pleasing to these very high mileage Mk.I OEM vision components.
Very cool Mini Lisa with Twiggy and ersatz Sony 3.5" FDD inspired SD installation? Real deal for in house use would have been just killer!
pièce de résistance from AppleDesign and the wizards of frogdesign?.
** All IMO based on long study of this specific subject and more than passing experience in airflow dynamics gained from HVAC Ducting, Dust Collection Ducting and Cyclone Separator design and fabrication IRL, sans formal fluid dynamics coursework.
***** You would not believe the flack I got on AppleFritter from Dr. Bob and company in that day for saying the Twiggy Drive in an exploded diagram illustration was a Shugart drive! It was, kinda . . . My GOOD/bad that.
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