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I found a 64MB module that was only recognized as 32MB in my 4400 (in the dual banked slots). I thought I had at least one more but not finding any. Yours for shipping from VA, USA if you are interested. On eBay these look look like they should work and are a great price IMO...

How much RAM are you looking for? I think I might have a 16MB and/or 32MB stick leftover from when I upgraded the RAM in my 4400. It took me a good while to find two 64 MB DIMMs for mine on eBay at a price I was willing to pay.

I don't think RAM from a 7200 will work in a 4400: https://www.applerepairmanuals.com/the_manuals_are_in_here/Power_Macintosh_7200_Series.pdf 7200: 5- volt, 64-bit-wide, 168-pin fast-paged mode, 70 ns DIMMs. https://www.applerepairmanuals.com/the_manuals_are_in_here/Power_Macintosh_4400.pdf...

There are likely others but Apple Personal Diagnostics can do that: https://macintoshgarden.org/apps/apple-personal-diagnostics-111

It just came up when I manually checked an eBay saved search for "Daystar Digital", listed as "daystar digital 105013-109 33 Mhz Card 01-FC040-001". Super lucky timing I suppose as I'm sure lots of people have saved searches/alerts set up. Thanks for the tips/pointers!

Sure. No luck so far. I don't think "PSI Integration Inc" made it to the web era to have a possibly archived website/downloads. :-/ Did find a somewhat interesting product/pricing list in Mac User Feb 92:

I seem to be hitting the jack pot on 68k L2 cache in that I think I picked up one of these Daystar "FastCache Quadra" L2 modules for cheap on eBay (after also finding one for the IIsi). Any pointers to the QuadControl v2.3 extension download? I don't see it on Macintosh Garden. It's labelled...

I just bought one of these off eBay recently! (did I buy it from you/did you sell yours?). Did you need any Extension/software to enable it?

Bought a "daystar digital 105013-109 33 Mhz Card 01-FC040-001" off eBay, this is a 68040 PDS L2 cache, right?

Sorry, my sarcasm to text failed here. My 180 has tunnel vision and as per what most people see its takes some number of minutes for it to affect use. My poor attempt at a joke was if I only use it for 2 minutes I can pretend it does not have tunnel vision. Guess I’m not quitting my day job for...

I think that's the reverse question, what would be some nice "matching" speakers for a 6400/6500 which has a built-in subwoofer? As far as I know this one specific early/original version of the AppleDesign Powered Speakers are the only Apple external speakers that will work with any Mac, that...

I went down this exact same rabbit hole a couple years ago via eBay and couldn't find a Platinum-esque subwoofer I was willing to pay the price for, I only wanted to pay something under ~$30. There was at least one model by "Advent" that I had my eye on, I think it might have been "Advent...

My 180 is tunnel vision-free! Yes siree, absolutely perfect! ...now I don't turn it on for more than 2 minutes at a time but I see no reason to believe that it is anything but perfect! (Lego Movie Unikitty voice: "is this working?")

There is some info on this isn the PB 2400 and 3400 developer notes. There are copies here among other places. http://powerbook.micahgartman.com/ RAM Expansion 1 The PowerBook 2400c computer accommodates one SO (small outline) DIMM for RAM expansion. The DIMM can have either 16 or 32 MB...

I have the NewerTeck 117MHz PPC upgrade (that comes with 8MB RAM) not the Apple original but I found this on Macintosh Garden: https://macintoshgarden.org/apps/macintosh-powerbook-powerpc-upgrade-the-powerbook-500-series-computer which appears to be a CD that Apple shipped with their PB 500...

Pulled mine out to check PB 540c w/PPC Upgrade - Gestalt ID 126: PB 540c w/Stock CPU - Gestalt ID 72: