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Yes, it definitely gives a sad chime for bad or loose RAM in bank B. In fact, for loose RAM in bank B, it let's you know immediately. And yet, for loose RAM in bank A, it does not. Maybe you're right that it assumes bank A is empty and just stops.

I recently purchased a Macintosh IIfx that came with an unusually large amount of RAM: 80 MB. The RAM is in the form of 4 x 16 MB SIMM (64 MB bank A) and 4 x 4 MB SIMMs (16 MB bank B). The 16 MB SIMMs are composite; each one consisting of 4 rows of 4 MB of RAM per SIMM. I have never seem...

I can drag my IIsi from the basement and take a look. I assume you don't have a working IIsi where you can swap components to isolate the problem to either the motherboard or power supply?

Despite what is written in Apple's PowerBook 100 developer note, other sites indicate that the PowerBook 100's ROM is a newer revision than the Portable.

Yes, I have both in working condition and would be happy to test it.. Sending a PM.

I haven't decided how I want to proceed. I accomplished the personal goals I had for the project: 1. Archive more of the file attributes than BinHex provides. 2. Make it work in all original Mac operating system versions. 3. Easily transfer individual files (screen shots, drivers, small apps...

Yes. Two ways: 1. If you have a terminal application running on a modern macOS system, you can transfer the file over the serial cable using XMODEM (on the modern Mac) to Tiny Transfer (on the SE/30). 2. Or, if you have a Macintosh emulator running, you can transfer the file from Tiny Transfer...

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...