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Here's a record for 3.0.6. Here's a screengrab of the results. The 3.2.3 run is on the left, 3.0.6 on the right. Clearly some difference between the two, so use the 3.0.6 one for your comparisons (or do a run in 3.2.3 to see if you can reproduce it).

No worries, I'll rerun it with 3.06.

Sorry for not clarifying on Speedometer, the versions I used were Speedometer 3.2.3 and 4.0.2 (and I labeled them 3 and 4 as you surmised). I also have a 33MHz FPU, your overclock on your 16MHz one matches perfectly. And yes, I was using an external BlueSCSI v2 as my host drive on the latest...

@JDW Here's a stuff-it file of test result files from benchmarks I ran on my CC with my LC 550/CC II board. I pulled them off my disk image via Infinite Mac. I skipped the disk benchmarks on MacBench because they took forever and aren't relevant to CPU performance. Plus, MacBench crashed after...

Bumping this golden oldie, but in case anyone was searching for it, there are differences between the various models and optical drives in terms of connection. This is detailed in the July 1994 Service Guide for Macintosh computers on pages 110-111. There are three different chassis harness...

My enabler's version string says 1.0.2, it was installed from the LC 550 image from the Apple Legacy Recovery CD-ROM. Every enabler I've downloaded from multiple sources labeled 1.0.2 (the garden, MacGUI, old FTPs, etc) has blank strings. While I can't 100% definitively say there's no 1.0.2...

That's expected for About This Macintosh. This is because in System Enabler 403 the model names for the gestalt values for the 550 (and CC II) are blank, and in that case About This Mac will simply say "Macintosh" (even though it will display the proper icon for the chassis the board is...

Right, what I meant was that the LC III's behavior could be used as a basis to investigate further on the LC 520/550 (like the Color Classic was for this circuit). There are at least third party schematics for the LC III; as well as the LC III reloaded project. They could be used as a starting...

Based on looking at the 520/550 board, it looks like an equivalent to R75 doesn't exist. But thank you for confirming the general suspicion! The logical guess is that it's related to the clock control on the LC III architecture. The functions of Omega (LC III clock control chip) were folded...

There is another unpopulated transistor in that region, Q6, on the back side of the board. This is the smaller transistor that looks like Q2 on the color classic board. Based on the CC description of the circuit I'm betting R80 is a resistor used in that ROM SIMM programming feature. I think...

That is true. I'd call it a difference, because it doesn't bother me that much, but it could definitely be an issue for others.

Have you forgotten my post from a while back about why those borders differ? ;)

I am curious what a transistor and a jumper in line would be used for. I'm no board expert but vestigial R80 seems right.

Thanks for the info. I could not recall what your tests with previous mods were, so this is helpful information. The stock CC board not working at 640x480 60Hz makes sense, because I could find no evidence of the LC II architecture supporting 60Hz 640x480 output. It wouldn't recognize that...

Of note, there's another way to identify boards: their serial schemas. I've noticed two different schemas for 520s: EZxxxxxxDY7 and DWxxxxxxDY7. The DW boards are the later ones (the serial labels say Rev D). I think the difference is that the EZ boards were made in Singapore while the DW ones...

I believe on these machines the Gestalt is determined from some combination of CPU speed and sense pin detection on the machine's logic board connector. The ROMs are identical between LC 520, LC 550, and Color Classic II and they all use the same System Enabler 403. My LC 550 board inside the...

I can also confirm that R80 is missing on my Rev A LC550 logic board for another data point. No idea if R80 is populated on a Rev B board. Re: LC550/CC II, the LC550 and CC II logic boards are the same logic board. There's no separate part; they're one and the same. All CC IIs had 512K VRAM on...

Thanks for that video! The slight syncing differences between the CC and 520 boards (66.6 for the CC vs 66.7 for the LC 520/575) make sense due to the color classic's LC/LC II-based video. Those systems (and the CC and Mac TV which are derived from them) are specified to run at 66.62 Hz versus...

I believe it should look similar to the LC 575 board with IIe card in terms of borders/geometry, but I'm curious about the refresh rate. It should be observable if it's running at 60Hz or 67Hz if using a camera set to 67Hz.

@JDW, That's interesting. I assumed that a CC stock board to behave the same as a Mac TV/520/550/575 board in terms of standard Mac video timing (and thus geometry) at 640x480 67Hz. But now you've got me thinking. First, some basics: The CC (and Mac TV)'s video comes from the Spice and Tinker...