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If you've got that much memory working with a IIci, then at this point I have almost zero doubt that my problem was the particular SIMMs I used. Only makes me more curious about the specifics of OP's IIfx.

Are you using the stock IIfx ROM and a reasonably small amount of RAM? I've gotten A/UX 3 to freeze while booting on a IIci before by either using a ROMinator SIMM or >32 megs of memory. Both would get it stuck for seemingly different reasons.

Accelerated video and an Ethernet card would probably be the most accessible. I was personally able to get an E-Machines Futura SX and an Asante Ethernet card for very little, a few months ago. There are accelerators with adapters for the CPU socket (if present), and of course Radius Rocket...

I could've sworn SE/30 logic board (and IIsi?) was six layers, and the IIci and IIcx's middle layers were the ground/power planes, with the logic conveniently on the visible sides.

I had a SE for ages before I was able to get my hands on '030 stuff, and so I always wanted some kind of minimal module player. Without System 7 or Sound Manager, just a single-tasking music player like the original Super Studio Session. I can't wait to see how you did this, because it's a...

This control panel's entry range is clamped to [1920,2019] I think. Have you tried adding the 2020 Patch to your Extensions directory?

Would it be wise to preemptively recap a PM7200 logic board ASAP? Nothing's gone bad yet. I'm unsure if this is as urgent as with the woefully leaky, late-80's SMT electrolytics, which seemed to go bad much sooner (and with more of a mess) than later-generation ones. I know the need for new caps...

My bad: "Alternate Ethernet" is also shown in the separate pulldown selection in the TCP/IP settings in Open Transport and the like, so I thought that was the control panel being described, rather than the AppleTalk one.

OP, if you don't mind my asking, did you make sure the AppleTalk control panel on your SE/30 has EtherTalk selected, and not the printer/modem ports? I'm almost sure you've already thought of this, since it'd be how you got the other Macs to see each other in Chooser, but that setting frequently...

Oh, good idea. I actually used your webpage to pick the SST flash parts in the first place, because the other replacements weren't carried by Digikey. I also picked the IIcx EPROM replacement with help from that page, so it's already been incredibly helpful. I don't personally mind bodges in...

I got a TL866II Plus, which was pretty affordable and works great in Windows VMs. I considered a Relatively Universal ROM Programmer as well, but my Arduino is currently serving as a Nintendo 64 Joybus to USB adapter, and the thought of having to adjust a trimpot to control programming voltages...

Yes, and the relevant part of the datasheet (which I completely missed) supports this. OE has to be low input and WE high to read. Vice versa during erasing and flashing. Since I used a normal OTP/windowless EPROM for the IIcx ROM repair on the same day, this one difference with the flash chips...

Oops, sorry if I forgot to clarify this, me mucking with ROMs just to get stock ones must've sounded pretty silly in the OP. I was using a ROMinator this entire time because there was a fault in the mask ROMs in my otherwise fully functional IIci. I've been trying to get the machine's built-in...

Recently, I ordered four SST39SF010A chips and flashed them with the correct four parts of the Mac IIci stock ROM (DWORD bytes 1,2,3,4 interleaved). I inserted them to my sockets in the correct orientation and order, powered on the IIci, and got the normal speaker pop with no chimes or any...

Final(?) update, and hopefully with enough time in between for replying to myself not to be spammy. I finally bit the bullet and bought a universal ROM flasher/programmer, so after coming a long way, my IIcx has closure! The flashing software was featureful enough to load the second bytes out...