Recent content by indrora

Early transistors (outside of Bell Labs' voltage-current exchange model) were a pain and could suffer from certain forms of diode breakdown that only really affect mid-70s era germanium diode based biopolar transistors. This is well within the design tolerances and very much an intended use of...

The official Sony PCBs are 1.0m or 1.2mm thick, depending on generation and how you measure them, I suspect some of them are 1mm with a heavier copper weight/ENIG Gold pass. One I found had actual Hard Gold. Whatever Sony could get cheap. The counterfeit cards I have are nearly universally...

Good question! I dug up the schematics for the spch-3000R (one of the original models) and we find that there's two possibly interesting pins: /DSR and /INT. I'm going to assume here (dangerous of me) that /INT is what we on the other side call /ATT in Takeshi's schematics... But hold your...

I don't know if it'll help. At this point, I'm going to follow the hardware side suggestions and begin suspecting that we're doing something out of order in software. According to the SD Association's Physical Layer Simplified Specification, this is the flow we should be doing: CMD0 CMD8...

DHL Guy had some goodies for me: Unfortunately, I fudged up and left DO floating and VSS tied to what should have been DO, not GND. Whoops! Nothing a quick bodge can't fix: It works! Zero for two on SanDisk, but a cheap Kingston did fine with it. I can confirm that adjusting the circuit...

I believe the reason was "had them on hand", since much of the design was done before the part shortages kicked in.

My version is built to be hand solder-able. Finding a full size SD slot that has bigger pads would make it fairly easy to hand solder. The head of the thead has the design from @Takeshi linked.

I believe there is. The SD Association publishes a simplified version of the spec which I think is what SanDisk is referencing for timing. I know it's "some amount of time". I'm thinking "capacitor and zener diode one shot timer" tier stuff at this point, not 555 one shot timer shenanigans...

His post indicated that he had better reliability, and several other users seemed to echo that. It's in the spec, and there's no harm in having them there for the cards that do want them (in my experience, the ones from Lexar get picky.) I've done enough projects with SD cards that I'm familiar...

I had a similar idea, probably talked a bit about it on the gbdev discord, and then work got in my way. Didn't mean to step on toes, nor was I aware of you working on something like that (I don't follow you anywhere). Similarly, wasn't my intent to look like a shill; I've been following this...

Agreed that the FETs used in the original design are way overkill. I have a batch based on this that use a standard, cheap npn transistor instead. (link removed by Coro) I'm going to pick up a few of these. as for SD card compatibility: I've been reading up on a lot of the possible options...