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I believe they used to bin by batch and location on the wafer (quality varies between the middle and edge of a wafer?), and only test a limited subset. Combined with, as you mention, if the 25MHz part was significantly outselling the 33MHz part, there is a chance that they would ship higher...

Its something that has been done by a fair few manufacturers over the years. DayStar Turbo 040 upgrades sometimes came with HRC processors, or even regular ones, clocked higher than the printed value. Apple themselves produced LC IIIs with 16MHz processors running at 25, and LC III+s with 25MHz...

BTW, the jumpers are here :

Here are the jumper settings for two speeds for the card you have. I've labelled pin 1 (which is marked on the board) and the front of the machine. You'll need to remove the tamper seal sticker (Oh no! The Warranty! That expired decades ago! 😆), then remove the block. Sometimes you can manage...

Hey R5D4, I have been messing about with similar stuff today and yesterday. I got a new to me Blue and White G3, the B&W and Beige machines are quite similar. Like has been mentioned the ZIF board doesn't carry over the processor speed, its set by the logic board jumpers (except for some cards...

Passive (or active) termination wouldn't be difficult to add on board. https://flylib.com/books/4/55/1/html/2/images/07fig20.jpg

@fehervaria @Kai Robinson The PCB isn't my design, so I don't have the design files, but it is entirely an adapter, not even any passives. It wouldn't take long to draw one up from the pinouts of the two connectors. Most of my drives have an integrated terminator, so I just use that.

PCB? :) The solution is wonderfully more simple than you're expecting. SCSI++ https://www.ebay.co.uk/itm/5-Pack-Centronics-50-Pin-IDC-Type-Female-CN50-Crimp-Connector-for-Ribbon-Cable-/391815176412...

The Centronics adapter probably makes more sense as not everybody has Zip drive system->system SCSI leads knocking about :)

I can't remember where I got it, but I also have one with a male IDC connector so I can plug a ribbon cable into it. I also made my own centronics to IDC adapter so I could make my own enclosure ;)

Yeah, that sort of thing. There are loads cheap on eBay :) https://www.ebay.co.uk/itm/12V-5V-2A-USB-to-IDE-SATA-Power-Supply-Adapter-Hard-Drive-HDD-CD-ROM-AC-DC-MU-/193776258549

I know Imagemagick can do it on the linux command line, is how I've implemented resizing on my own stuff previously, but that is LAN / embedded bodging stuff. @Kai Robinson mentioned that it might just be a "xenforo setting".

Transferring data to a new internal disk... externally. Handy bodge when you don't have many external SCSI enclosures ;)

When uploading photos from my phone, they're usually high res, 6MB files. While I sometimes want and need this, this is usually excessive and the only reason I haven't reduced the quality is because the process is convoluted on my phone. Is optional down sampling at upload feasable? There are...

I picked up a Centris 650 a few weeks back and have been making a few upgrades. So far I have done the following : Upgraded the RAM to 104MB Added an AudioMedia II sound card Added the missing Reset / Interrupt buttons Added a Stage II Rocket Fitted a tray loading CD bezel Fitted a 600i CD...