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I just finished watching. Very nice video. I wrote a comment under the video to explain that the LC575 board is very sensitive when it comes to overclocking. I'm curious if he tried stably overclocking beyond 45MHz (a) with the PPC card completely removed, or (b) with a different 040 CPU. I...

Thank you very much! Here are the latest YouTube Stats... "Your estimated revenue" doesn't exist because I don't allow Ads on my videos. Even at 5K subscribers, Ads wouldn't bring me anything but a few measly dollars per month, and that tiny sum wouldn't be worth my time needed to report...

You know you're getting successful on YouTube when foreign language SPAM hits seconds or minutes after a video debut... You'd think that they'd use German names instead of Vladimir and Martinez. Anyway, as you can see, I like to have fun with the spammers before I delete them.

I just released a video review of the Speedy Bends, axial component lead forming tools. I also updated my BOM with the exact Speedy Bend tool and slot number you need for every passive component which can use the tools! While made of plastic, these are quality tools which surprisingly are NOT...

Zane, I will ask.

I've been exchanging PM's with a former SuperMac engineer. He mentioned to me today that the ProdigySE could support 8MB, thanks to its 68851 PMMU chip, which is shown in the following control panel... So merely, connecting address lines alone is not something that would enable more than 4MB...

Meaning, if you do one of those releases per month and add 2 months for added development work on the accelerator, we should be able to see the WarpSE debut around March 2023. 🤞🤞🤞

I do recall seeing that SCSI drive case before. And after a little Googling... PocketPro ad at left on page 31 ($29.95 without adapter, $54.95 with): https://www.wap.org/journal/showcase/washingtonapplepijournal1996v18no4.pdf PocketPro 25S ad at right on page 95 ($29.95 without adapter...

It might be possible to find. It's just not high priority for me right now since I have other good and working 1MB SIMMs. But I can come back to this at anytime, get a new chip and see if that works. Pretty amazing animated GIF you made there! That must have taken some serious time to...

EBAY shows four 1MB SIMMs for a good price until shipping to Japan is added https://www.ebay.com/itm/153233852691 So I don't really know.

Thank you very much! I will do that test when I have time, but for now, I humbly wish to thank you for educating me on the proper way to diagnose 30-pin RAM SIMMs down to the chip level. Amazing!

I confirmed that pins 1 & 25 are connected to each other on all 8 chips. I then tested between SIMM pad 23 and pin 1 of each chip and found that only the second IC from the right, as shown below, is connected to pad 23.

@YMK I apologize. I was busy and hadn't looked at the LC321000-10 datasheet (SMD chip version) as I should have. But extracting the relevant chip diagram from the correct SMD version datasheet shows this... Din = pin 1 Dout = pin 25 So the 2 pieces of advice you gave me were: You should...

@YMK To understand how to test "D6" I was looking for a schematic of 8-chip 30-pin SIMMs. I only found this one, which doesn't have 8 chips... SOURCE: https://alexandrugroza.ro/microelectronics/system-design/4mx9-simm/index.html The only useful thing the above schematic tells me is that...

Thank you for the specific guidance! I appreciate it. I've extracted the content you spoke of here... It is basically the same content as what @retr01 posted here, and what is shown on this website. It was that same info I consulted when putting together my opening post. Simply put, that...

@Crutch , could you please provide an exact link to the "THINK Reference" you are referring to? The best I can find on Macintosh Garden is Symantec THINK C 6.0.1, but when I open "THINK Reference" on "Development.img" in Mini vMac, I only see this... Now THAT is the speedy testing tip I was...

Kai, thank you for your reply. I gleaned the Rear = Bank A, Front = Bank B info from this Low End Mac article. (6th paragraph from the top) I know for a fact which SIMM is bad because I put it into different slots with 3 other known-good SIMMs and the Sad Mac codes changed in accordance to the...

I've been testing my inventory of 1MB RAM SIMMs using my Mac SE Reloaded machine, and with one particular set of SIMMs, I get a Sad Mac at cold boot showing these 2 lines: 00000004 <— "Bank A" 00004000 <— Failed bits... AABBCCDD AA = bits 31-24 BB = bits 23-16 CC = bits 15-8 DD = bits 7-0...

MFM encoding in combination with an ST-412 interface. Details... https://en.wikipedia.org/wiki/ST506/ST412