Macintosh Plus Internal SCSI MOD

[360alaska]

Hey all,

I've been working on a way to connect a SCSI2SD internally to a Macintosh Plus, I'm still waiting on a right angle 50-pin header so it will fit in the case but here's what I have so far:

Step 1: Install a header



Step 2: Install the circuit board and connect to GND and TPWR(with Diode)





Step 3: Connect a random hard drive and see if it works:



I'm still polishing my idea a little, but in the future I may be able to offer kits to the community. 

 

[68krazy]

VERY COOL!

 

[BadGoldEagle]

I want one so bad!

So, it's just a matter of installing the SCSI chip on a socket and plugging the daughterboard on top of the chip, right? Awesome idea.

 

[360alaska]

No, the scsi chip is not removed! This board piggybacks on the chip!

 

[olePigeon]

Oooo.  Very cool.

 

[werdna]

How's this project going? I really, really want to buy one of those kits if you plan to make them.

 

[360alaska]

I ordered another board but have yet to install it.

 

[360alaska]

I've made a little progress, I need to do one more board revision and this project will be complete. The good news is that I’ve made it possible to fit the adapter in the case by making the board a little longer and using a right angle connector. This allows the cable to exit the back and loop around into system and connect to a SCSI2SD or hard drive. For persons with expert soldering abilities it can be installed without removing the external SCSI connector but I suspect most will want to remove it.

 

[360alaska]

Another logic board, different pics:

 

[werdna]

I'm a bit confused as to how this installs; I'm worried I don't have the soldering skills to put it in. I suppose that red wire supplies just enough power for the SCSI2SD to function, so I'll at least have to solder that to the board. Aside from that, does this just clip on to the SCSI chip, or is there more going on here? Forgive my ignorance. :/  

And does this always prevent the external connector from working? I assume then that the issue of the cable needing to leave the case only applies to if you want to connect an external drive; since the connector won't actually work, it needs to be convenient to slip the cable out of the case. Otherwise, the cable just folds inwards to where the SCSI2SD is placed. I don't care about connecting external SCSI drives so it's not an issue for me regardless.

 

[360alaska]

To install one solders a header into the back row of pins and then solders my board to the header. Then you solder a diode and a ground wire. Pretty easy! 

It does not prevent the external connector from working at all, to the Mac plus it’s just another scsi device. 

 

[360alaska]

View attachment 22193



My final board design is complete and I couldn’t be happier! This setup is perfect for my Brainstorm accelerated board.(The Brainstorm accelerator doesn’t support HD20)

 

[mactjaap]

Super cool! Would love to try this a my Plus!

 

[360alaska]

That can be arranged!

 

[360alaska]

Here is file in case anyone wants to make one:

View attachment pscsi2.zip

 

[rabbitholecomputing]

Very cool! Who did you use? Oshpark? What's the license on the adapter?

 

[360alaska]

Yes, you can use oshpark, as far as license it’s something I made for the community but if you want to start selling it or offering a service I would appreciate a small cut of something.

 

[Joris W]

I’m getting the parts together to follow in your footsteps, 360alaska. 

Did you end up getting that angled header? If so mind sharing where?

 

[Trash80toHP_Mini]

Another logic board, different pics:

View attachment 21857

Very cool!  :approve: I missed your update, dunno if it's feasible, but this picture makes me wonder if you could crimp a new IDC connector so the cable exits the top? If it will work that way you don't need to do the looparound? You could also shorten it to a custom length at the same time.

I figure you've already tried it, but it never hurts to ask.