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Yeah, as others have said that looks like a Mobius. You can either use their drivers, or the GemStart driver works just fine with it too. Yeah, my Mobius came with a 68EC030 too. They don't need the MMU unless you're doing something that needs Virtual. I swapped a proper 030 into mine. I...

Oh, no, you misunderstand :) You said yes, I was just apologising as it was so long ago and you might have forgotten.

... with SCIENCE OK, I don't believe this should be under Nubus Macs, but there isn't a section that really matches the architecture of the 6200, 6300, 5200, 5300 family of machines. About a year or more ago I spent a load of time doing comparative benchmarking of the 6200 and 6100 to try to...

Just out of curiosity, the LC / Performa category says to go to the Beige PowerPC section for PowerPC Performas... But then you go to the PowerPC forum section and get this : So, where does the 6200, 5200, 6300 and 5500, plus all the variants, sit? 🤣 Edit - I guess we could call them LC-PDS...

I appreciate the thoughts, but there are still several options, that isn't a show stopper. I could for example, remove R899, or, as I am most likely going to, I could feed in a signal that had similar characteristics to the Apple II card. That is why I'm interested in seeing the actual...

Pretty basic - it mirrors the signal coming out of the DFAC for the host's sound on the LC and LC II. Blue is straight out of the DFAC, red is from the LC-PDS. Note after the highlighting ends, they're common. Other than the decoupling and resistor not much going on, not exactly fancy mixing.

Isn't it always the way - I suspect if I had more free time at the moment I'd probably use it to sleep! Yes, as per my original post. I have the option of potentially feeding in a similar 3.3v logic signal, but I don't own an Apple II card, so before I cause harm due to an oversight, it is...

Good afternoon folks! Does anyone have... 1. An LC family Macintosh like the LC 475 or older... 2. An Apple II LC PDS card 3. An oscilloscope 4. Some spare time! I'm curious to find out about the electrical characteristics of the audio output from the card. It comes out of the card on Pin A1...

Hum, so a little bit of info on the Sonnet cards - they actually ignore the CPU clock multiplier and just do their own thing, so that wouldn't matter, although the bus speed would, and compatibility might need checking for that to make sure they rated the specific part to 100MHz. If we assume...

Apple put a check in the firmware on the B&W G3 that checks if the CPU is a G4 (they knew they were on the way ahead of time). It blocks booting if it detects one. Processor upgrade manufacturers made firmware patches that fixed this, but you need to install them before you swap out the G3 for...

@Kai Robinson There is an odd thing I've noticed - when an image is mostly shades of grey (like a beige Mac), sometimes the forum de-saturates it. See the post I'm linking to. I uploaded the photo of the C650... then I noticed the apple badges went desaturated, so I deleted and reuploaded...

Folks, feedback from someone with a 40MHz 650 is that the extension actually slightly slows down CPU execution, so I suspect the apple RAM timings specifically are already quite tight. It did slightly speed up video though. At some point I'll drag my 650 out and set it up, until then this is...

It isn't an alternative - it doesn't touch the clock speed. Only the mini wombats, the 475 / 575s have the programmable bus clock. If you have a 475 or 575, you wouldn't. If you have any other kind of Wombat, the 475 Overclock stuff doesn't work on them.

This is a test release of a slightly underwhelming System Extension that tweaks the memory timings of a Wombat family mac to speed them up. This extension should work on.... the 475, 476, 575, 577, 605, 610, 650 and 800. Just to warn you, I only saw about 3% performance lift overall, although...

Thanks for the update. If you do have any stability issues, they might be most cheaply resolved by just adding a fan to the heatsink. The chipset is designed to handle 40MHz and so should be happy. One other issue I had was that I found that some of my RAM didn't like running at 40MHz, I'm not...

Excellent news - that was quick :) Your Centris should now be just a hair faster than a Quadra 840av! What System version are you using? Did you use my System Enabler? What type of jumper did you use? Do you have a picture of the jumper you fitted?

(You'll have to forgive me - I made several edits to my last post, so make sure you read the final version)

Mine actually started as a 25MHz machine :) I've run it all the way up to 50MHz with various mods. Strangely, it is easier to convert a 25MHz machine to 40MHz than to 33MHz. I'd actually recommend going to 40MHz rather than 33. 1. If you're running System 7.1, install the System Enabler I...

Good morning @AlpineRaven. If you don't mind, I'll have a go at answering. I have a soft spot for Wombat family machines. That's fun - my dad has a Quadra 650 in a IIcx case in a similar manner. One thing to start with - I've heard that DOS cards work in over clocked machines - but I don't have...

If you're aiming for 40MHz, there are much easier ways to do it - plus you can use 40MHz timings, so that the serial ports etc keep working. https://elephantandchicken.co.uk/stuffandnonsense/?p=3019