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My recent restoration projects have focused on the Macintosh II line, several of which I used in the early days of my NASA career. I wrote about previous restorations of a Macintosh IIci and Macintosh IIsi on TinkerDifferent. Today’s story is about my personal Holy Grail machine, one that I...

James, for the 7.5.5 image did you edit the gusd resource to enable booting on an SE/30?

Check your CPU. Can’t tell if it is the pic or not, but around pins 11 and 12 there looks like a solder ball. I got a gray screen with my IIci due to some bent pins touching on my CPU. I also wrote about my experiences working on the soft power circuit area here...

Yes, that’s it, Kai. Thank you. The list is proving handy in identifying equivalents for the 24- and 28-pin SRAM chips. I’ve started my troubleshooting of the dead cache card and hope to have more to share soon.

Out of curiosity @Kai Robinson i recall a guide you posted a while back showing memory chip equivalents, but I couldn’t find it. Could you share a link? I’m curious if it has the 24- and 28-pin static RAM chips that my cache cards have such as the CY7C185 and P4C116.

I don’t know much about the 475, but @Kay K.M.Mods created the Spicy O’Clock and he lists the 475 as an overclocking candidate.

I managed to get a second cache card. I’m still curious about troubleshooting the card you sent, especially with the anecdotal evidence of cache cards commonly failing as mentioned earlier in the thread. I’d like to know why.

Here are the same benchmarks as before, with the addition of a Centris 650 (68040 @25 MHz), Quadra 630 (68040 @33 MHz), and a Color Classic Mystic (LC 575 board) overclocked to 40 MHz. Interesting. My takeaway is that the Interware Booster is OK for boosting performance some, but doesn't come...

Yeah, I didn’t write about the PSU daughter board in my write up. It brought to mind the board in an Apple 300i caddy loading CD that I recapped. What a cheap, low-quality board! Naturally, I lost a pad when refurbing the daughter board. I thought for a brief second whether the pad repair might...

Yes, I have seen a few references to swapping out the 50 MHz oscillator, so that is on my future tinkering list. I saw your post and was curious about using the fourth connector from the speaker to drive the LED with disk activity. I tried a simple connection from the fourth to third connector...

I recently came into possession of a Macintosh IIsi for $30 from Yahoo! Japan Auction via the Buyee proxy service, and I thought it would make for an excellent restoration project. As is often common for items on Yahoo! Japan Auction, the IIsi was marked as “junk”. I figured it was worth a...

I managed to score one of these beauties for my Mac IIci, an Interware Booster 40-33 sporting the version 1.1.1 ROM from 1994. It may be a little hard to see above the heatsink, but it is rocking an XC68040RC33M variant of the 68040. Below is a MacBench 3.0 comparison of a stock Mac Iici...

Following. I have a Quadra 630 that exhibits the same green tinting, whether I use a Macintosh Color Display or an Apple Multiple Scan 15 Display.

I went with the triple LR44 route for my Mystic Color Classic. I found a battery holder here.

That did the trick, thanks!

I’ve encountered the same problem, and haven’t quite figured out how to resolve it.

A follow-up to the Mac IIci success story.... Playing around with the IIci, I found that if I ran it for a few hours, it would shut off and attempt to restart, fail, restart, etc. until I pulled the power plug. If I left it unplugged it for a few hours, it would boot normally, then repeat the...

I’ve been following this thread with a growing sense of excitement. I started my career at NASA 35 years ago as a C and FORTRAN programmer. The idea of dusting off my programming chops and translating them into the classic Mac world somehow sounds oddly appealing. Looking forward to the classes...

Yeah, C16 definitely barfed its goo and made UH1 grungy. I scrubbed it but didn’t remove it for my initial test. I’ll take a closer look at it and definitely will test the NuBus slots once I acquire a card. Thanks!

Hey all - I recently acquired a Mac IIci. Although it is not the IIfx on my Holy Grail list, it is a close second. While I was running skiprope simulations on my IIfx in the early 90s, many of my NASA colleagues were doing work on the IIci. As you can see, it was a little rough looking. Very...