Nice! I know a few others who have recently built one too. Any notes or photos you have I'd love to hear. Where did you get your PCB from? How are you handling termination (I suppose you are just terminating the next device since you made a chain). Anything you think that could be improved on the hardware or software side?
I didn't make a PCB. I soldered 25 wires from one DB-25 connector to the next one, then soldered a second set of wires to the Blue Pill. For an SD card adapter I just bought the cheapest breakout board my local electronics store had. When I don't have any other devices on the SCSI bus and I plug it directly into the back of the Mac without a cable, the wires are short enough that it actually doesn't need any termination at all. And as you say, when it's in a chain, I terminate the last device.
That's one of the great advantages here - sure these projects are more immature (they're just starting out) - have a ton of potential. Amazing to see what others are already adding to RaSCSI (making a framebuffer capture device)
Limiting scope and price - I think RaSCSI has a nice price point to (much higher) feature set - if you want to go that route. Here it's more on lower price points with a sole focus - something you could stick into each machine if you wanted. I'm sure you could add a lot more here - and maybe someone will, but for now I'm happy with the price/perf/features.
I had lots of help from ztto's existing work, @landoGriffin, and a bunch of youtube videos
That's the plan! Right now it's jumpers but those get lost easily (but easily found too)
Still haven't had time to clean up and push everything - click watch on github and you'll be the first to know when I do
Correct - I got through it as you did, but defiantly will be documented on my repo as well. Early in the project, lot going on!
Yep! Not going to knock the socks off a scsi2sd or hdd - but will be a nice alternative. I've only tested in Norton so far - will test in that utility too and post some numbers.
interesting, i should probably, check how much current the se/30 can provided on the scsi 5v termination line compared to the current draw of this hdd emulator, as well as the current draw of the microsdcard i was using.
, so take this with a pinch of salt.thats interesting to know, i guess maybe the se/30 is one of those borderline designs?I don't think it's even that; my suspicion is that it's just slightly borderline design on a couple of models. Earlier ones and later ones both seem to work. Though I haven't looked into this scientifically other than sighing and finding workarounds
It may not even be a matter of current. I noticed while poking around with my SE/30 that there appears to be a Schottky diode drop on the SCSI termination power rail, resulting in a voltage of about 4.6V iirc. This makes sense, as you don't want another device on the SCSI chain also providing term power (like my CD-ROM does) "fighting" with the power supply. This might just be marginal enough even with the low dropout of the regulator on the Blue Pill that the processor isn't getting enough voltage. And I imagine some Blue Pills have better LDOs than others, considering everybody makes them.I don't think it's even that; my suspicion is that it's just slightly borderline design on a couple of models. Earlier ones and later ones both seem to work. Though I haven't looked into this scientifically other than sighing and finding workarounds
). I would love to put a few of these together to drop into some stuff.
