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I already tried that. I removed all the RAM, the G3 card, and populated the PDS slot with the terminator. I also tried swapping the cache and ROM SIMMs with no luck. Do you know if there's a way to check if a CPU is dead with a multimeter somehow?

While messing around with my Workgroup Server 9150, I managed to kill the motherboard. I was plugging in one of those PDS ribbon cables (for use with a HPV/AV video card) into a Sonnet G3 upgrade, and the connector went in at somewhat of an angle, managing to short some pins on the PDS...

Has anyone tried overclocking the bus on the MDD beyond 167MHz (e.g. 200MHz)? I know the bus on low-end 133MHz MDD boards can be changed to 167MHz by removing R676. Can it be modified further by messing with the adjacent R677, R678, etc?

If anyone wants to try for 50MHz, here's a checklist of what you'd probably want: Get a 68040 that overclocks well (later revision mask?) + active cooling. Change Gestalt ID to 51 or 59 by removing R151, R152 for 40MHz ROM timings. Solder 70ns (or 60ns, but good luck finding them) VRAMs to the...

It's just like any other kind of SMD desoldering/soldering work. You'll need a hot air rework station and some flux to remove the old ram chips, then you can install the new ones either with the rework station or with a normal soldering iron. If you've never done SMD rework, I would suggest...

Just thought I'd share an update for anyone who's curious. I managed to get my hands on some 70ns VRAMs. Soldering them onto the Quadra 800's motherboard did not fix the issue. My guess is that you'd need to change timings in the ROM of the PPC Upgrade Card in order to get things to work...

I know you're trying to fix a II; are you trying to rule out whether the PSU is broken? Have you tried jump starting the computer? If you short two of the pins on the PSU, you can start the machine (I forgot which ones, but you can look it up). This will let you know if the PSU is dead or not...

I'm not sure how MAME emulates the Mac II, but is it possible what you experienced was related to the Mac II's ROMs not supporting >1MB SIMMs in bank A? I found another source here which again claims that stock Mac II ROMs support up to 68MB with a PMMU, so I'm pretty confident it's the case...

I don't think this is correct. According to the one of the reproduction Mac II 4MB PAL SIMM designers, a Mac II with stock ROM and 68851 can support up to 68MB of RAM. The original Mac II ROMs require that bank A is populated with 256KB or 1MB SIMMs, but Bank B can use 256KB, 1MB, 4MB or 16MB...

The 10ns parts from Mouser arrived today and I am pleased to announce that the Apple PowerPC Upgrade Card now works stably at 80MHz! I haven't really tried pushing it with games or anything, but it was still working after half an hour or so of sitting on the desktop. There are still some very...

Yeah I bought a PPCA601FF-080c-2. I don't think they would be hard to fake, since you could probably remove the printing with some kind of solvent. The labeling seems to sit on top of the package, rather than being imprinted into it. However, if they were fake, they'd probably re-mark them as...

After some more fiddling around, it looks like the issue definitely is related to component speed ratings. When cold, the machine actually boots all the way to the desktop. However, as the computer warms up, small graphical glitches start to occur and a few minutes later the machine completely...

I have an Apple PowerPC 601 upgrade card that I want to run at 80MHz in my overclocked 40MHz Quadra 800. I replaced the 66MHz QFP 601 with an 80MHz rated part. However, the computer won't boot at 80MHz (crashes immediately upon loading from the hard disk). It at least chimes and shows video...

I recently bought a IIfx with this video card in it. It's quite strange; I've never seen a Nubus video card with a VGA connector on it. It also has a mysterious second connector. The card is labeled "BigView Video Board" and seems to have been manufactured by a company called "Stella Systek...

So I've since acquired a second IIfx motherboard, one which is pristine and has never seen abuse. The second IIfx motherboard exhibits the exact same behavior with 800k floppies. As such, I'm inclined to believe this is just a quirk of the IIfx, as I find it extremely unlikely that two boards...

If your motherboard has a tantalum installed at C1, I'd replace it with an electrolytic part. Either that or use a 25V rated tantalum. C1 is attached to the 12V line, and it's often advised to de-rate tantalum capacitors by 50% of their rated voltage. Running them close to their rated voltage...

The IIfx did have an incident where the 12V line on the PSU got shorted for a few seconds due to a faulty tantalum capacitor (which promptly caught fire and exploded). It may have caused damage to other components. Do you have any idea where to look in order to test the voltage theory? The...

I don't think that's the case because when I take the drive and attach it to another mac, it works fine. Likewise, if I take a drive from another mac and put it in the IIfx, it suddenly exhibits this issue. Because of this, I'm almost certain it has to do with something on the IIfx's motherboard.

I have a really strange issue with floppies in my IIfx. For some reason, the IIfx will read 1.44MB disks fine, but will only read some 800K disks. It reads 800K commercial software disks, as well as 800K disks that were formatted on the IIfx, but it won't read 800K disks that were formatted on...

I think it was just the speaker. I swapped it out with a different one and it sounds better. Part of me thinks the chime is still slightly off with the other speaker, but it could just be placebo. Interestingly though, the motherboard wouldn't read any floppies even with known good...