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Yeah !! Next week I will try them with my PowerMac 9500. Thanks again!!

No problem! Any help for users is a good thing. But yes, it seems to be a different issue from the one I have. The REV B RAMDAC is 343S1075, whereas the REV A RAMDAC is 357S0010. The REV B 343S1075 (AC843) RAMDAC should be the same found in the Quadra 950 and on some RasterOps cards (for...

Just for fun I tried an LCD monitor, but of course nothing changed. One thing is certain: REV A has this problem, we’re sure of it by now. Some of us have to live with it (myself included); others may have hardware that has held up better over time or received a batch of components less prone to...

Yes, those are the date codes; my “bad” card is very close to ObeyDaleks’ card. I don’t know; the cards are practically identical.

Mine is 268 9026, very close to your “bad” card. But I noticed something: do you have GWorld RAM installed on your good board? Is there any difference if you install the RAM on the bad board?

Yeah, you’re probably right. I think I’ve resigned myself a bit as well. But I’m very curious to understand why some Rev. A units work while others don’t. So, it looks like a sync problem and, unless I’m saying something silly, the synchronization is handled by the RAMDAC. Are we sure every Rev...

I did a clean install of System 7.1 Update 3.0 and absolutely nothing changed. So at this point I have a Macintosh IIci running System 7.1 Update 3.0 and an 8•24 GC with ROM 341-0812. Of course I also installed the card’s software. It may be that whatever component degrades over time is further...

Okay, I’m starting a clean installation of the System and Control Panel. I’ve also rolled back to the previous ROM version. David, you might have the key to solving this mystery. Since your board is heat-sensitive, do you have a can of freeze spray? If so, could you cool the various parts of...

Exactly. I’ve tried both ROM 341-0812 and ROM 341-0266. Tomorrow I’ll do a fresh install of System 7.1 Update 3 and test everything with the same ROM version you’re using. I’m curious to see if I can fix the problem the way you did. Anyway this thing is very strange :)

Is there an extension for the 8•24 GC? I only have a control panel… Just to add some extra information: I tried the board with both ROM version 1.0 and version 1.1, no change. I tested it in a Quadra 700, a IIci, and an IIfx, and the same problem appears. Operating time and temperature make no...

Exactly, I also think it’s an issue that occurs after the VRAM. Besides, if it were VRAM-related it should persist even at higher colour depths. Is it possible to find the schematic somewhere? I’ve been looking but haven’t found anything.

Yes, I tested with the following monitors: M0401Z, M1212, M2935, M1031 Portrait (worst-case scenario), and Sony Trinitron E500. All monitors were tested at a resolution of 640×480 (except, of course, the M1031). The defect is most noticeable in black and white, barely visible with 4 colors, and...

Yes, you’re probably right; I’d been thinking along the same lines. I actually ran a VRAM diagnostic with TechTool 2, and every test passed without any issues. Could it be a problem with the RAMDAC? Still, if it turns out to be the VRAM, I’ll have to let it go. Those VRAM chips are impossible to...

Hi everyone! Probably is a silly question but... I just picked up an 8•24 GC card, and I’m wondering if something’s off: whenever I switch the display to black-and-white, I get the strange output shown in the photo. In 8-bit and 16-bit colour modes, the card works flawlessly. Want do you think...

Absolutely, the 1.2mm thickness is essential :) I just noticed that I have the KM41C16000CK, not the KM41C16000BK. The only difference seems to be that the BK version is 50ns, while the CK is 60ns. Since the IIfx can handle RAM up to 80ns, there shouldn’t be any issue.

@dougg3 Thank you for your response. I don’t recommend Garrett’s Workshop RAM because it has capacitors positioned right behind the slot clips, making it difficult to attach. Thanks again for sharing the Gerber files so the community can benefit from them.

Hi guys, I recently got my hands on some KM41C16000CK-6 chips. That's enough to build about 64mb of ram. Can anyone help me find the Geber files for the Doug Brown simms? Thanks a lot in advance

Hi everyone, any news on these drivers?

Thanks, as soon as I have the drivers I will try to check if everything is working properly 🤞

Thank you so much!! Let me know if you find something.