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I'm pretty sure that the overlay starts high : ...

Just double checked, you should have three jumpers fitted on the board total. W1, which enabled the onboard ROM, and W3 with two jumpers, which are always fitted - they're something to do with disabling some CPU lines that were probably used during debugging at Apple.

Good work, it is that hard bit. Tedious and repetitive. Yeah, that sounds like no code is executing. If I have things the right way about, High is the start state, and it should drop low when code starts executing. Hum, given the above, we already half have an answer, but what I'd probably do...

Lets take a pause and breath in how awesome it is that someone cloned a Rocket before we ask them to do an even more difficult job of redesigning it into something even the original manufacturer didn't make :ROFLMAO:. Also, apparently modern FPGAs often struggle to get the low latency...

That sounds like a bad cable or poor termination. First thing to do is check your termination settings - things sometimes still "work" when set wrong, just you get an increased number of retries meaning slower throughput. If that doesn't help, try a different cable? Issues like this aside, the...

Yeah it was me that first raised it as a solution on 68kmla (I never saw it anywhere before, but I mean, apple engineers knew and someone else might have spotted it if they were familiar with the 88916 and beeped around the chip). My machines were always stable at 33MHz so I hadn't needed to...

Was worth checking :)

What EEPROM part was fitted before you did any modifications? SATA cards use a mixture of 3.3v and 5v EEPROMs depending on the board design, the MX29LV040 is a (nominally) 3.3v part. If your card is feeding it 5v, that might explain why it died.

I've made a couple of tweaks to your drawing, sorry they're not in the same font (and one is a little small!). I hope you don't mind! : I added the main clock because I think it is worth grabbing (I've called it the reference clock, because all other clocks are created from it, but a...

Yeah, that is just Mac OS 8.0 with a custom boot screen. I used to always be editing mine as a kid, and there was commercial software to make it easier. Not that it was hard anyway, you just needed to shove a MacPaint document or file with a pict resource in the system folder with the right name.

:) Good luck

When things are a bit less hectic, could you run some of the Phil's computer Lab benchmarks? I can probably dig out a pre-made image for you if needed (but I think someone already has on Mac Garden - I'll take a look and edit this post). I'm curious how the 5x86 compares to the 100MHz Intel...

The black 6100 :) Just to warn you, I believe they clash with the lid, so people have to do a bit of hacking, plus you need an extension like the one you have in the 650. At least, that's what it says on Jagshouse.

I mean, if you want it to happen fairly quickly, 27 Ohm would motivate them with about 100mA @ 3v. I'd probably use 68 Ohm though for 50mA @ 3V. It will just finish flattening them. You could just put a blue or white LED on them though, that would give you a visual indication (don't use other...

That's a lovely job, did you do a thread about the build anywhere? Sorry if I missed it. That has also come up amazingly well. The 650 is the best 68k Mac in my opinion. Stable 40MHz overclocks are trivial by adding one or two SMD resistors and two jumper headers. Its really easy to do. Best...

Oh, if you want them to fail, you might need to put a load resistor on them. Sat in a jar they're less likely to do anything.

The 50% over rating requirement wasn't realised until later. The reason they're not just called 8V parts or physically better rated is for continuity from before they realised they'd under rated them due to in the wild failures. Apple followed the guidance that was available at the time...

I worked out what the confusion was and the reason I had thought it wasn't possible.... The resistors are on the bottom of the 630 style board, and on the top of the 580 style board. Basically I'd gone looking in the same place and found only one of the four resistor footprints.

Yeah, there was a an option that had a PDS terminator and a Apple Display 24AC Nubus card. Also the 8150 shipped like that.

7100 is also recessed and the end of the socket is flush (it seems to protrude slightly on the 6100 - so while the opening is recessed, the end of the socket isn't).