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Amazing find. Thank you for sharing this with the community.

Well, well, well. I don't know what's up with LC II computers and bad 341-0476 ROMs. I had the same symptoms: no chime, grey screen, good voltages, oscillators good, ~reset and ROM OE good. I played switch-a-roo with another LC II and found the ROM was bad. I burned a replacement with the...

Great write up! I assume this is a 820-0163-03 board. I can't quite see what it says in the upper-left of the board. Good fix on the video board.

I believe those are date codes. So, 26th week of 1990 and 47th week of 1990.

Here is the software in BinHex format. Use BinHex, StuffIt, or Tiny Transfer to extract it. One control panel is for System 6. The other is for System 7. You'll get a cool rocket ship taking off when you reboot. You still use the Monitors control panel to choose the number of colors. The 8-24...

Oh. You are not going to like this answer. The 8-24 GC control panel is required to enable acceleration on the card. Your 'wicked fast' card has been 'average speed' for 10 years.

I can now confirm that all three of my cards display perfectly (at least on the Dell LCD) after the software starts, although sometimes they need a minute or two to 'warm up', during which the artifacts are easily visible. After that, perfect B&W. I also was able to shoot a video that showed...

That's it. 8*24 GC v7.0.1. I just tested from a cold boot. The software definitely fixes the artifacts on my revision A with 341-0812 ROM running on a IIci with System 7.1 w/System Update 3.0. I believe 341-0812 is what you consider 1.0 ROM

All right. I have some very weird news. I powered down and let my card and computer cool off. Then, I cold started. Lots of artifacts. I let it run for ten minutes. No improvement. I rebooted. No improvement. I realized that I did not have the 8*24 GC extension installed. I dragged it into the...

I just found my third card. Sadly, not a revision B. Your comment made me take another look. For my third card, the artifacts fade as the card warms up. That is, they are very noticeable at cold start -- even after reaching the Finder. After sitting for a couple of minutes, the screen looks...

I tried two of my 8 24 GC cards (Rev A, System 7.1. With and without driver.). In B&W, both of my cards display a blue artifact repeating across the screen. I'm displaying mine on an LCD screen, which is likely why it looks different than your coloring. The point is, it sure seems like this...

I'm leaning against a VRAM problem. Look at the areas of pure white and pure black in the windows. There are no missing or added pixels. Look at the edges of thin black lines, such as the large square in the Monitors control panel window. The horizontal line is clean all the way across. But...

Ah yes! I, too, have referenced that power circuit. I'm glad that I have been able to contribute a little something back to it.

Got it. Well, the length of the file name is truncated to 31 characters before encoding in Tiny Transfer. So, that won't be a problem. That's also supported. Tiny Transfer supports AppleEvents in System 7 -- and thus should be able to process multiple files at a time. Prior to System 7...

That's exactly what I thought when I was recapping/cleaning one of those older revisions. When I couldn't tone out the power-off side of the switch per the schematic, I ended up following the trace using the 'brush' method. That's where you connect one side of the multimeter to a metal brush and...

Yeah, information like that is exactly what I'm looking for. Some other possible sources of longer filenames: * AU/X * HFS+ * CD-ROMs

Thank you. To me, it is like solving an old puzzle and sharing the solution with friends.

(continued from previous) Power Off Oddity After pressing the rear power button on any of the Macintosh II line (II, IIx, IIcx, IIci, IIfx, etc), the computer turns on. Quick -- what happens if you then immediately hold down the rear power button? It turns off, right? Well, surprise surprise...

(continued from previous) Macintosh II 820-0228-A Don't be confused by the 'A' on the end. Notice the part number has increased from 0163 to 0228. This 'A' board is newer than the 'B' board pictured above. This 'A' board is the most common. Aside: The words "Macintosh II" have moved from the...

There are at least four production versions of the Macintosh II logic board that I'm aware of. I'd be interested if anyone has a board other than the ones listed below. Macintosh II 820-0163-02 I don't have this board. The next set of images is from Bruce at Branchus Creations. This is the...