Jump to content
zackl

Early Mac LC proto?

Recommended Posts

2 hours ago, North Hedge Ned said:

Even more strange , EveilCapitalist, is that that second floppy port would work!  I did this experiment years ago by attaching a second floppy to that unit and knocking out the faceplate - taking the space where the HD would normally go.  I also left the HDD connected.  So my hacked LC had a floppy hanging out of the side, and I was able to copy floppy to floppy with it, and even run games two floppies at a time to avoid the need to swap disks all of the time.  Kind of an impractical build, but a successful proof of concept nonetheless.  Now, to find that unit among my boxes of goodies.....

Thats not strange, thats by design. His post was referring to the fact that the case lacked a second floppy opening even though the mobo had dual connectors. Implies the LC was not originally meant to have two floppies. Or it means this is in fact a later case design for single manual-inject setup with an earlier motherboard.

Share this post


Link to post
Share on other sites

I don't know if any shipped this way, but, yes, the original LC had room for two floppies, and two diskette openings. They probably shifted gears on that one because 1990 and system 7 was the point at which it would've looked *too* outmoded to ship a floppy-only system.

 

It wouldn't surprise me (I haven't owned one in 20 years, and I had that for a grand ol' couple days) if the LCII kept the LC's second FDC, with the literal only change to the board being the '030 CPU. It would have been easier to just do that than actually build a new board.

Share this post


Link to post
Share on other sites

2 floppy version was available as the extra low-cost variant for education.  The idea is that you could install a HDD later when they were more affordable, or reuse HDDs from other machines that were being put to pasture.

Share this post


Link to post
Share on other sites

The early lc’s did have a blanking plate didn’t they like the se so could easily add a floppy i did a hdd fill that space?

Share this post


Link to post
Share on other sites
On 4/30/2018 at 11:44 AM, MrGasS27 said:

Yep, this is an LC prototype

 

both.jpg

This is not a definitive photo comparison between proto and production, as I think there is one other proto board in between these.  I have two LC proto's that have the reset button (where the production does not), but the config of VRAM and RAM and VSLU of what is the production board pictured on the right.  Likely there were several board revisions prior to release.  Just filling in the gaps ;)

IMG_6361.JPG

IMG_6363.JPG

IMG_6350.JPG

IMG_6351.JPG

Share this post


Link to post
Share on other sites
38 minutes ago, North Hedge Ned said:

This is not a definitive photo comparison between proto and production, as I think there is one other proto board in between these.  I have two LC proto's that have the reset button (where the production does not), but the config of VRAM and RAM and VSLU of what is the production board pictured on the right.  Likely there were several board revisions prior to release.  Just filling in the gaps ;)

 

 

 

That is amazing, thanks for sharing. 

 

How did you find your two protos?

Share this post


Link to post
Share on other sites

I have the same Logic Board, with those stickers, reset switch and big capacitor.

 

Of course the casing has not the orange sticker and mine has the model name.

Share this post


Link to post
Share on other sites
On 9/3/2019 at 10:42 AM, zackl said:

 

That is amazing, thanks for sharing. 

 

How did you find your two protos?

I have had these things for years.  Mine came from the warehouse clear out from Apple Canada.  I worked there in the late 90's.  They were clearing out all kinds of stuff, and I decided to grab it all (for a fair lot price) in hopes of one day making a museum.  Life happened, so the museum did not.  Now I have the need to sell it all off as it is taking up so much room - so there are these and a few other goodies that I didn't even know that I had really, until now when I really get a good look at them.  Both power supplies are shot on these things, but using my working one from my LCIII, one unit work flawlessly, booting off an 80MB drive into SSW 6.01, I think it is.  The other, the one with the confidential markings on the chips, boots to a flashing ? and the 40SC HD does not boot.  Also, too a strange whistling sound like old radio frequency changing.  The battery is totally corroded away too.  Might be something up as a result of that too.  Will keep plugging along on these and the rest of my collection.

 

If you're interested, I have just started a blog that will detail each unit as I discover what they are - http://techcollector.northhedge.com/blog

Share this post


Link to post
Share on other sites

A few second floppy notes:

 

1. The LC II lacks the connector for the second floppy but it looks like most of the framework for it is there. Other than the 030, extra RAM, and lack of second floppy connector, the most notable change on the LC II board is the fact there are pin connectors for the fan and speaker (though it can still accept the assembly from the original LC).

 

2. There were single floppy LC IIs sold to schools at bargain prices. I believe they also sold an LC I this way.

 

3. There was indeed a blanking plate there. Look at an LC versus an LC II and you'll see it. It's similar to the ones on the SE and big-box Mac II, but unlike the SE, it lacks the LED cutout. 

 

4. Can anyone with a IIe-Card equipped dual floppy LC handy confirm if the Apple II card sees the second internal floppy as a second 3.5" drive? I could always mod one of my spare LCs into one if need be to test, but if someone has one around or has tried, let me know.

Share this post


Link to post
Share on other sites

I picked up a bunch of LCs recently and one seems to be a very early board:

 

DSC_0708.jpg.290f5d25b89ba6237e306e67813e7cd3.jpg

 

The very large capacitor and reset switch were odd as the rest of them weren't like this. The case it was in is otherwise a normal production LC.

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

×