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Curious, with a CPU card with this ROM installed in a 520/540 does the OS (7.1.1) see it as a 550?

Glad to post, I find them fascinating too!

Got some time to play with this tonight. Suspect Apple ADB Keyboard with my Iici works just fine. Switching it back to the Q700 unchanged problem behavior. My Q700 has 7.5.3 Rev 2 installed in its HD so I decided to boot off an Apple original 7.5.3 Disk Tools floppy see if that made a...

Agreed. Although the power key only works for the initial start-up kick-off, once booted when pressed it is not recognized by Key Caps, just like all the other keys. Yet TattleTech on the Q700 seeing the Standard Keyboard in its list of ADB devices and the mouse connected through it works just...

More data points, swapping in an Apple ADB Keyboard II works just fine for the Q700 and test the suspect Apple ADB Keyboard with my SE/30 also works fine. Back to the Q700, same issue, bizarre...

So weird problem, I have an Apple ADB Keyboard (M0116) that has no problem starting a Quadra 700, the Apple Desktop Bus Mouse connected through it works fine, yet none of the keys are recognized... Key Caps shows it recognizes a standard ADB keyboard (as does TattleTech) so it's working to some...

Okay, I do have an LCR meter that I think should work but it may take me a while to be able to work on this with enough free time and the right level of attention, those are some small caps! Hopefully you're not in a rush!

I have what looks to be the same Newer Technology G3 upgrade card but at 250MHz. Your missing caps look the same as the other unmarked brown caps that are used all over this board. I think they'd need to be desoldered to measure the capacitance for sure but maybe they are "standard" decoupling...

Maybe try DeoxIT contact cleaner on RAM slots? I had success with that reviving a B&W G3 that couldn't boot in manner similar to what you're describing. Could also try it on the edge connector, don't think it could hurt.

Necro post. Same question, wondering if the duo could run at 40MHz... https://www.highox.com/duo2.html

Does the PowerBook 100 need the same BlueSCSI v2 "Mac Plus" ini file tweaks that the Macintosh Portable needs? The PB 100 is pretty much a repackaged Portable, but I guess it could have some tweaks? Worth trying if this is unknown I guess: https://bluescsi.com/docs/Compatibility#portable

AK II fan here. It's small, works ....and doesn't look like a PC keyboard. ;-)

Very cool! There are some TA/KB/TIL articles that mention the LaserWriter SC archived here: https://savagetaylor.com/til/articles.html System 7: Using Personal LaserWriter SC and LaserWriter IISC - TIL07861 Power Macintosh 6100 & Personal LaserWriter SC (1994-05-01) - TIL15397 Mac OS 8.x: No...

I'm normally silent about forum strife like this and maybe I should have stayed that way... I was in no way saying that anyone should not dispute inaccuracies, and/or offer opinions. In general I just wish the tone was more civil, less judgmental, less mean. Again this is a global statement...

My comments were directed at everyone, not sure why you would think they were directed at you vs. others. And I certainly I did not say there was anything wrong with expressing opinions, correcting the record as you see it, I just wish there wasn't snarkiness involved. I'll leave it to others...

I really wish we could all find a way to get along better. :-/ It seems like there should be more we have in common than what separates us, we all love vintage Macs! Can we try to see things from other prospectives? Agree to disagree and try to avoid snarky comments? Express our opinions...

AM85c80 Which is a combined SCSI Serial IC. Apple referred to it the "Combo Chip" in hardware development notes, e.g. PowerBook 100 Hardware Developer Note. SCC and SCSI interfaces A custom chip called Combo combines the functions of the SCC and the SCSI controller in a single device. This...

Would any of the info on or linked to from this project be helpful? https://github.com/warmech/apple-13w3-display-connector-adapter

Great post, interesting! Is this a 1MB L2 cache module produced by Apple? Can you post some pictures of it?

For what it's worth I have one of these Quaddoublers that came to me in a Centris 610 and it does work* in my Quadra 605 (basically same thing as LC 475). *Mine did not come with a fan so it seems to overheat and lock up the system pretty quick running at 50Mhz in the Q605, at only 40MHz in the...