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Nice find, @finkmac! Thank you for posting it. I will not try flashing another card, though, until you also dump the contents of this EEPROM, which I think is a AT24C02B: Sorry, I have been burned before :)

Thanks guys! Yes, I was measuring with the CPU board unplugged. The clock goes out to the rest of the computer, but only via a buffer, MPC904 on the Apple card and ICS9112-17 on the Sonnet card, so it should be terminated on the card. Weirdly, the MPC904 appears to be designed to work with a...

With the help of Tiny Turbo, I was able to push my 7600 to the promised land of 60MHz bus speed. I took a 180MHz 604e card (the 630-2490-A in the table above), set its multiplier to 3x, and removed R49 to set its CLKID pins to match a 60MHz Power Computing card (I meant to tag @Fizzbinn above...

I had an idea about two weeks ago: I have a lot of ideas; not all of them are good, and not all of them get seen through, but this one seemed good enough, and was pretty simple to implement, so here we go: It's a potentiometer-adjustable silicon oscillator that fits in the common half-size...

Man, that's brilliant. I gotta start using that one at work. I agree the concept is fun, and I'm glad you're having fun with it. Just needed a bit of polish before releasing to the world. I expect we'll be seeing it on Hackaday soon regardless.

Just be sure not to use white solder mask--Ariston Technologies has it trademarked! :LOL:

Depends on the OS version. By 10.4.11, most brands of CD/DVD-RW drives were supported well by the OS and/or Toast.

That's a fantastic idea, and well executed!

I have tried the VT6421 cards in a 5400 and a 7600. I'm ready to declare that they just don't work well in Old World machines. They show up in System Profiler, and connected drives will appear and work to some extent, but file transfers will hang, OS installs will fail, and booting always fails...

I got curious enough about the level shifters to poke around with a scope today. I tried a few lines on the address bus and they are indeed 3.3V logic. Other signals, however, are still 5V; ArArtry_I is one example I found. So, why run everything through level shifters if there are only a few...

Following @trag's lead, I decided to do some investigation. I have four CPU cards on hand: a 120, a 180, a 233, and a small Sonnet G3. The three resistors in question are really conspicuous on Apple cards; they're on the front of the card right down by the gold fingers of the edge connector...

Crikey, the ol' ST M25P10 has gone obsolete. That used to be the go-to. If I needed to buy some new ones today, I'd probably try one of these MX25L1006s. That seems like a (relatively) newer part though, and I'm not sure how broad ATIFLASH's Flash ROM chip support is...another good option might...

Awesome info, thank you for posting this! Did it shoot the disk across the room afterward? ;)

Board revisions, as far as I know: P80 - This is the Quadro4 700 XGL, 750 XGL, and Geforce4 Ti 4400. There is a schematic available. It uses a parallel flash ROM and has one DVI port, and BOM options for an S-Video or VESA Stereo port (the latter not much use to Mac users) and a VGA or second...

Yeah, I agree it wasn't until the next generation of cards that manufacturers seemed to realize that they needed to get serious about keeping these things cool. That reminds me, for anyone who buys the NOS coolers from Surplus Sales of Nebraska--they're awesome, totally brand new, but that...

Coming back to Q200, which I mentioned epoxying a heatsink to on the Quadro4 700 XGL in my first post--my thermal epoxy seems to be past its use-by date. It's taking forever to cure; days, when it should be hours. I touched that heatsink and it just fell off, luckily not while the card was...

Is the RAM on that in TSOP or BGA packages? The TSOPs are generally robust. Someone leaked Arti's old ROM Maker apps on MacRumors a few years back, so you can have a go at making a Mac ROM for your card if you want to.