Jump to content
Sign in to follow this  
badCaps

Help ID this port?

Recommended Posts

Picked up a 512k recently and saw this port on the back.  This is an add on SCSI port replacing the battery slot, right?  Curious if anyone can identify this hardware and who manufactured it.  Assuming it includes an associated controller card.  Port is metal, looks well made, and the hole is screwdriver access.  Found a few other similar products, but none have this style of scsi port that is protruding from the case.

 

Have not opened it up yet to check the board inside for markings.

 

Anyone recognize it?

 

scsi.thumb.png.a614b01cafe3be81634c2e93c093e432.png

 

Similar products:

 

Mac Snap

https://web.archive.org/web/20060517040357/http://www.vintagemacworld.com/macsnap.html

https://web.archive.org/web/20060622022158/http://www.vintagemacworld.com/macsnap/macsnap_rear.jpg

 

Mac Rescue:

 

 

Edited by badCaps
move picture

Share this post


Link to post
Share on other sites

Not a clue, but be careful when you take the bucket off. There's no telling how much or how little slack there will be for disconnecting the cable before tearing something asunder. Is that branding on the case? Outside of that it looks remarkably clean.

Share this post


Link to post
Share on other sites
46 minutes ago, badCaps said:

Picked up a 512k recently and saw this port on the back.  This is an add on SCSI port replacing the battery slot, right?  Curious if anyone can identify this hardware and who manufactured it.

There were at least half a dozen vendors of add-on SCSI for Mac 512K in the mid-1980s. You'll have to open the case and see who made it. Most, or probably all, of these designs had their genesis from a Dr. Dobb's article.

 

Oh, and it doesn't really "replace" the battery slot, but grafts atop it. There could still be a battery back there, so you'll want to see about removing it if present.

Edited by Dog Cow

Share this post


Link to post
Share on other sites

Also some of the battery holders were trimmed on one side to accommodate the cable. Just FYI if you ever replace the supply. If not trimmed the cable gets very pinched and the case does not close perfectly.

Share this post


Link to post
Share on other sites
On 5/5/2019 at 6:28 PM, Trash80toHP_Mini said:

Not a clue, but be careful when you take the bucket off. There's no telling how much or how little slack there will be for disconnecting the cable before tearing something asunder. Is that branding on the case? Outside of that it looks remarkably clean.

The writing on the back appears the be the last name and phone number of a prior owner engraved with one of those handheld electric engravers.  Otherwise, it does appear to be clean and in good external condition.

 

On 5/5/2019 at 6:43 PM, Dog Cow said:

There were at least half a dozen vendors of add-on SCSI for Mac 512K in the mid-1980s. You'll have to open the case and see who made it. Most, or probably all, of these designs had their genesis from a Dr. Dobb's article.

 

Oh, and it doesn't really "replace" the battery slot, but grafts atop it. There could still be a battery back there, so you'll want to see about removing it if present.

Thanks for the history, I did find the dobb article and usenet discussion, cool read.  Also found this little summary that was helpful: https://macgui.com/usenet/?group=8&id=2072

 

 

On 5/5/2019 at 7:22 PM, unity said:

Also some of the battery holders were trimmed on one side to accommodate the cable. Just FYI if you ever replace the supply. If not trimmed the cable gets very pinched and the case does not close perfectly.

Appreciate the tip, looks like my next step is (careful) disassembly to find the origins.

 

Now I'll just need to find a long screwdriver to get at those fasteners deep in the handle.

Share this post


Link to post
Share on other sites
30 minutes ago, Dog Cow said:

Yeah, and I'm planning to build one too for my Mac 512K. I bought a NCR 5380 SCSI controller a couple months ago. 

Wow just realized that the link I posted is YOUR blog.  Came up in a search randomly and just now saw it in your sig.  Awesome resource!  I'll be sure to follow the SCSI project if you are posting on your blog or have a thread going here.

Share this post


Link to post
Share on other sites
13 minutes ago, badCaps said:

 I'll be sure to follow the SCSI project if you are posting on your blog or have a thread going here.

Yes, it will be in the Mac 512K Blog.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×