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From the images you've provided - it's confirmed my hypothesis - it's a clock doubler. The 89.92MHz oscillator is divided by 2 to give you 44.96MHz - the PAL's are there to decouple the onboard clock from the 68040 clock, letting the CPU run asynchronous to the bus, thus eliminating any issues...

You likely won't break anything - just needs to be unplugged from the socket it's in - sometimes you just need to take your time levering it back and forth with a plastic tool, or your fingers. Hard to tell what it is for definite, as the parts are mostly on the side you can't see - we're only...

Found another one for the UK: https://microdream.co.uk/catalogsearch/result/?q=apple+powermac

That looks very much like a speed doubler - or L2 cache, as @Fizzbinn mentioned. You can get it out of the socket by gently wiggling it and pulling on it, or you can lever it with a plastic spudger?

Came across this today - would be ideal for anyone looking to resurrect a dead machine without having to resort to cannibalising the ever decreasing number of working machines out there. https://monotech.fwscart.com/MOS_CPU_Replacer_(65108501)/p6083514_21591072.aspx Technically it'll replace...

FB, in PCB Silkscreen nomenclature, stands for Ferrite Bead - they're just wire links with a ferrite surrounding them - used for noise suppression - any cheap ferrite bead from eBay would do the job :)

Honestly i'd be really interested to see what would be possible with the Apollo '080 core that's used in the Vampire series of Amiga accelerators.

This will allow the use of the PLCC ADB Transceiver in the Macintosh SE, which is the only model that uses a DIP18 part. There's not much to it other than that! @Branchus has used one of these, successfully, in a troublesome SE, iirc. The github page to the project and the gerbers, is here...

@AlexCL did something to a Mac, using a PiStorm, iirc, if that's the thing you're referring to?

So....Dual 7457's...overclocked to 1.2GHz @ 1.3v by the infamous herd - will shortly be headed my way for my QS board ;)

The test was not a failure - it was an alternative working mode! It proves that there's LIFE, JIM!

@JDW My previous employer was a firm called iSOS. Despite the horror stories from that place, they DID have a few very talented FileMaker guys employed there - who could certainly help - even an initial email conversation with them might be worth it. Filemaker Pro 12 is very, very old, I was...

A 16MHz '000 is half the speed of the '030 at 16MHz - the '030 has some L1 cache at least, and it does more work, per cycle.

I do hope that's not a professional modification! 😂 I can imagine the sales man giving it the smooth spiel - "Yeah, we make VIC-20's for schools, specially modified - juuuuust sign here on the dotted line for your order...we only ask for double the listing price" And when the purchasing...

...yikes! Someone attack it with a damp sponge! :D Were there any differences from the BBC other than presumably, the ROM?

Looks like i'm definitely heading to Cyprus for a week's R&R - where I plan to do as little as humanly possible...and enjoy every second!

@Melkhior Excellent question, i wondered that myself - but then i saw that IRQ is fed in by the 53C80 SCSI chip to GLU PIN 3 - i now realised i made a boo-boo by naming that one /IRQ or _IRQ in KiCAD. should just be IRQ, with the /IRQ being purely internal between gates...see, this is helping...

I never played Dune II, i was never really into the Dune universe until recently (thanks to Denis Villeneuve for that). What i'm grateful for though, is that Westwood went on to create Command & Conquer with that engine, iirc :)

Hey dude - sorry for the delayed response on this. Things like categories are still 'in flux' and are open to being tweaked. I'm the one responsible for the intial layout of the categories, so the blame/praise can land on my head! :D Initially, my though was this - I wanted a place that was...