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@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

It seems everyone now understands the HyperDrive I show is not SCSI, I should add that at 7:14 in my GCC HyperDrive 10 video, I show it is an ST-412 interface (instead of SCSI). That interface requires two cables. Also, as I point out in that same video, the HyperDrive was on the market at the...

Not sure. It was like that when I got it. But it probably can be straightened without issue. Now that I know the chip is pre-programmed, I need to build the board, then test it. I can then report back here as to the result.

Good question. You are referring to this ADB chip used by Kai's PCB... @Kai Robinson, from what board were these chips extracted? (The two in the photo above are the 2 you kindly shipped to me.)

Kai, thank you for that important clarification, especially because your Github page here does not clearly state the chips that you need must be special pre-programmed chips that are to be acquired from the place like UT source. In an older PM, you had previously told me the following... But...

Explained in green at the bottom of page 4 in my BOM here. I have not built or tested one of those boards because I have never bought the required programmer. I assume @Kai Robinson has programmed and tested at least one of them though.

I actually did some EBAY searching. For a scratched up 2G unit which nobody wants, you'll pay about US$80. For a more pristine unit that is also functional, you'll pay US$250. But if I had a functional unit, I'd probably keep it in a case or drawer mostly, whipping it out to show people when...

My preference too "if and only if" it arrives intact. Knowing how these items get kicked around, it probably wouldn't unless they spend a lot more on packing material to ensure the glass arrives in a pristine condition.

I take it you have the RAM chips with the Apple logo printed on them? Those seem to be the worst in terms of reliability for some reason.

What was your RetroBright formula? I always dunk my small parts in tupperware filled with 3% H2O2 and a bit of powdered Oxiclean, then I put plastic wrap on the top to limit evaporation. About 6 hours later in the hot sun, the parts are deyellowed without streaking. However... I always clean...

If ever you write a little app (or mod of the existing one) that can take advantage of the 68881 and 68882 FPUs, that would be really amazing! The Levco SuperMac SpeedCard I have now is having 68881 FPU issues. To be honest, I'm not sure if it is working. Neither Speedometer nor Norton System...

Spotted this on FaceBook today. Just a timing coincidence this news hit shortly after the debut of my video? Article here: https://www.macrumors.com/review/grid-studio-ipod-and-ipad-mini/ And for those of you thinking US$399 is pricey for the original iPhone, The article mentions that the...

😱😱😱 No wood texture at all on the black part of the Grid 1 frame, so the Sannahed frame you mention, based on internet photos I am seeing, would appear to be a close match.

I guess the iPhone isn't very popular as a topic, or perhaps my channel visitors just don't like it. Lower than normal views AND a loss of a Subscriber too! Yikes! Glad I'm not a full timer Youtuber. I notice the numbers but don't live by them. :)

My YouTube Channel stalker was quick with the Thumbs-down this time... Admittedly, I don't know if it's the same fellow or not, but there's always that one thumbs-down not matter what the video is about. Or maybe it really is a different person each time, upset because they were expecting a...