68kMLA Classic Interface

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IIfx board with Spectrum Eng DT-1088 in ROM slot

Posted by: Udo.Keller on 2019-06-21 01:49:53 Maybe I can help with some more details. Attached are some pictures of a new-in-box NewerTech Variable Speed Overdrive for the Quadra 700 and 900. Both the Manual  and the Floppy Disk label indicate that there was a version for the IIfx. I did a scan of the VSO User Manual. The driver software is still available online here.https://68kmla.org/bb/uploads/monthly_2019_06/IMG_2947.jpeg.0c101d25898e462d38c3f20694472d44.jpeg View attachment NewerTech_VSO_User_Manual.pdf

Posted by: Von on 2019-06-26 21:50:55 @Udo.Keller thanks much for this and the link to the *.pDF manual....that is gold!  Since my OP I have acquired a IIfx so I'll see if I can get this running when time allows.

Posted by: Von on 2019-07-13 21:07:10 THis auction ended Newer Technology Macintosh IIfx series clock upgrade. (80,90,100 Mhz) A Newer Technology Apple Macintosh IIfx processor clock upgrade card. It pushes in the to processor slot and then the processor pushes in to the upgrade card and is clipped to the two of the processor pin. Do not have any instructions and Newer Technology could not find any either. It is a cool piece of old tech. https://www.ebay.com/itm/Newer-Technology-Macintosh-IIfx-series-clock-upgrade-80-90-100-Mhz-/303221044649 I don't know how long the auction photos will be up so I grabbed them:

Posted by: CC_333 on 2019-11-30 22:39:24 Hey! I have one of these!! I wish someone knew exactly what it was and how to use it, though.... c

Posted by: Von on 2019-12-01 18:20:22 Getting my IIfx and this bit of kit working is high on my list.  Hoping to get to it around the holidays.

Posted by: jeremywork on 2020-12-12 13:35:26 I just snagged this for my IIfx... https://www.ebay.com/itm/Variable-Speed-Overdrive-for-Mac-IIfx/224276006387 Assuming the package is complete/original, DT-108B does seem to be correct for the IIfx, identical to the original post. I'll be excited to try this out and see what it does with just one oscillator, but I want some heatsinks first. (Downloaded auction photos so they're still accessible when eBay takes them down)

Posted by: olePigeon on 2021-01-15 13:43:51 @jeremywork Any update on that overclocker?

Posted by: jeremywork on 2021-01-15 15:21:54 @jeremywork Any update on that overclocker? Thanks for reminding me to update this. I received the VSO and everything looks to be in order, though I did need to order some thermal adhesive and heatsinks (found some suitable on amazon; these arrived last week as well.) I need to set aside a bit of time this coming week to install as well as scan the manual to PDF.  I did archive the diskette already in case anyone needs that: View attachment vso master.img

Posted by: olePigeon on 2021-01-16 05:49:00 @jeremywork Ah, cool!  I'd be keen to see some benchmarks.

Posted by: jeremywork on 2022-04-27 15:37:43 Oops, looks like my installation and results were wiped out in the crash. Installation process pics: https://imgur.com/a/wNAyi7a Video of function: Summary: The VSO sits in the ROM slot and allows software to set custom timing on the fly, overriding the crystal oscillator. The IIfx first boots at stock 40MHz, and once its extension loads it reboots with the VSO enabled using the last speed set. Unstable speed can be reverted simply by powering off, holding shift, changing the setting, and rebooting again. Edit: oh, and the manual is now re-attached.

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