Macintosh Plus Internal SCSI MOD

[360alaska]

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?

It's just a 2x25 right angle header without a shroud. You can get it on eBay, Amazon, Newerk, etc...

 

[LaPorta]

What sort of files are those?

 

[360alaska]

What sort of files are those?

Gerbers, so you can order the pcbs from a pcb service such as OSHpark

 

[Joris W]

I'm almost ready to install your board design, @360alaska.

While I'm not the most experienced electronics hacker, I am willing to do whatever it takes to get it installed. I know - inept but persistent. The worst kind, right?

Without asking you to hold my hand with each step, I have a few questions if I want to start putting this in. Putting pictures as links so they don't clutter my post.

1 - You've posted some great photos, between which the red wire seems to change places. Could you tell me where from and where to it goes in each case, or whichever spot worked best for you? Am I right to assume this is a ground wire?

Red wire 1 vs Red wire 2

2 - You mention connecting a diode. Is that an existing one where the ground goes, or is that something I need to add? If so, I notice my Mac has an unused one sitting half connected at R8, the DIMM bytesize switch. Could I use that?

My R8 diode

3 - The header bits I got in look the same as yours, except they're coupled together a little tighter so they don't line up with the pinholes in your board:

Narrow header pin strip

I know these arent the right angle ones, those are coming in this week from the same vendor. Did I buy the wrong header pins though looking at the margins? Or should I just snap off 25 separate pins and solder each into position?

4 - When putting the motherboard back into the machine, I notice the SCSI chip is sitting under the chassis pretty tightly. Is there room under there for your board + cable?

Cosy SCSI chip

Sorry about flying in from n00b land, and thanks in advance for any pointers here.

 

[360alaska]

1. Yes, any ground will work.

2. You need to connect a 1n4001 diode to the  between the board's "P" terminal and the the 5v side of CR1 position.

3. You need a header with 2.54mm/ .1 inch spacing.

4. Note sure what your asking here?

 

[Joris W]

Thanks.

4 - Whether the motherboard will fit back into the Mac, under that chassis, once the adapterboard and SCSI cable are on top of that SCSI chip.

 

[360alaska]

If installed as pictured then yes.

 

[Joris W]

@360alaska Are you not at all powering the SCSI2SD board like shown on your photos?

Or is the little bit of power going into your adapter board enough to make it run on the current coming through the SCSI cable?

If you are feeding the SCSI2SD board its own power, where from are you drawing it?

 

[aperezbios]

@360alaska Are you not at all powering the SCSI2SD board like shown on your photos?

Or is the little bit of power going into your adapter board enough to make it run on the current coming through the SCSI cable? 

If you are feeding the SCSI2SD board its own power, where from are you drawing it?

SCSI2SD V5.0, V5.1, and V6.0 are all capable of and designed to be powered by SCSI termination power alone, when the SCSI Host Bus Adapter provides it, which is almost, but not always, the case

 

[360alaska]

Yes, it is bus powered.

 

[nottomhanks]

Are you still selling these boards?  Would love to get 1 or 2!

Craig

 

[360alaska]

Sure,

Do you want me to install them on your boards or do you want to attempt install yourself?

PM me.

 

[Oldbuggy]

So where do you solder the header exactly? Do you drill into the board?