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How useful is the Performer upgrade, really? Besides making Finder flicking faster. You're practically limited to System 6 and below, and I don't think many programs that run on that System Software also require an 030.

Measure the current draw with an ammeter. A multimeter should do this too. I'm lucky that my fancy Nemic-Lambda LA-200 variable power supply has a built-in ammeter. Comes in handy so many times

So, there is a way to temporarily disable the Performer (and similar 020/030 upgrades for 68000 Macs). After the chime hold Interrupt on the Programmer's Switch, then quickly press Reset. After the second chime release Interrupt. The upgrade is disabled until the next boot. MacsBug doesn't work...

big fat fanny pack

I thought about mounting the fan on one of the transistor heatsinks, but would it even help?

https://github.com/luRaichu/polyphloisboisterous030

Here are the board files https://github.com/luRaichu/polyphloisboisterous030 I hope to see someone build this!

SRAM at that speed is still much more expensive than DRAM even today. And you would need to write your own logic, which is not something I understand.

If the DRAM is run with 0 wait states, does that negate a need for cache memory?

Finished building second unit today, this time with correctly assembled headers. Here's what the socket on top of the 68000 looks like. When fully seated, the bottom of the upgrade actually touches the top of one of the SIMMs. Not a big deal for me but I will try to make it shorter in the next...

Infinite time? you just specified a finite amount of time, 1 trillion years

thank GOD it's friday

22-degree sockets are available. https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/5822134-3/1122083

Why not use a 4MB 72-pin SIMM? The socket is still available on DigiKey.

What's the maximum amount of memory the Mercury 030 can address? How would you integrate the RAM expansion logic into the Performer? At a glance, the Mercury 030 GAL U3 seems slightly different than the Performer's GAL U3.

I installed a fan in the Plus for good measure... https://archive.org/details/mac_Macintosh_Repair_Upgrade_Secrets_1990/page/n155/mode/2up

I fondled the keyboard of a Macintosh 128k in a museum and to me it looks and feels slightly better than the Plus keyboard It's not convenient to be swapping floppies every time you want to load up a program, just get a SCSI disk emulator. BlueSCSI seems to be the cheapest at this moment, works...

Right now on eBay there's a parts/repair mouse for $23 and a few others for $40-50. I think my price is fair