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Sorry I put the wrong video link on my previous post, and I can't edit any longer. The right youtube video is here 

Thanks macdoogie. Anything you can find on the "mystery signal" topic would be great.  By the way, I am in the process of refurbishing 2 (perhaps 3) more Walkmacs of this type, that we will be putting up for sale. Not sure at what price and under what format (Private sales, eBay, CL... ?). If...

Thanks macdoogie. Yes, the orange plasma screen looks awesome. By the way, I am in the process of refurbishing 2 (perhaps 3) more Walkmacs of this type, that we will be putting up for sale. Not sure at what price and under what format (Private sales, eBay, CL... ?). If anyone in this forum is...

Update: I was able to salvage the 40MB drive, using Silverlining 5.6.1. When I chose the drive after it recognized it, I got an message saying the volume info was bad, and asking me to revert. The revert worked ! But I could not rescue the 1.7GB drive and I had to reinitialize. Fortunately, I...

So I had two perfectly good HDD's in two different external enclosures. One was big (1.7 GB), and the other one that I just revived from the "Sticky Actuator" syndrome, a 40MB Quantum Prodrive. I wanted to copy the content from the 40MB into the 1.7GB. So I daisy chained both of them to my SE...

Yes, based on a Mac Plus LB. As for the business question, we're still trying to figure it out. The person who I acquired this from knew Chuck Colby, and says that he had a Joint Venture with Apple. Colby and Wozniak knew each other for sure, and I saw an email from Woz to Colby (before he...

If you're interested, I put a few more pictures of the machine, together with some comments, in this other thread: 

Hi superjer2000. The void on the right side is for the detachable HDD and FDD units. On the photo, only the FDD is attached. Below are photos of the base unit, together with some descriptions I made. The electronics consists of a Mac Plus logic board at the bottom, and a Colby board that sits on...

It now works ! This could well be one of a very few operating Walkmacs on this planet.  

So it's now booting off the detachable FDD, or an external HDD. I had it booting from the detachable HDD for a while, but lost it. The connection to the SCSI chip of the LB appears to be quite temperamental. I also attach a high resolution photo of the screen. Based on some of the stuff read...

Fair enough ScutBoy, here it is ::-) . Now I need to figure out how to boot from the detachable floppy or HDD

So I can now say that booting up the LB of the Mac Plus requires +12V. Turned out the 12V line from the PS was fried because of a short in the Colby circuit board. After I got the +12V back, I got the LB to boot up.

Yes olePigeon, it was on Craigslist. I'm making progress reviving it. I'll update soon.

I recently acquired an original Walkmac (photo below) from the estate of the late Chuck Colby, founder of Colby Computers. The Walkmac used a Mac Plus logic board, and attached an LCD and a battery to package an arguably fully portable computer (it still missed a keyboard and a mouse), a full...

So I recently acquired an original Walkmac (photo below) from the estate of the late Chuck Colby, founder of Colby Computers. The Walkmac used a Mac Plus logic board, and attached an LCD and a battery to package an arguably fully portable computer (it still missed a keyboard and a mouse), a full...

I bought this one for $15 and free shipping. I know cost is not too far from a used HDD that would work, but I thought it would be a good piece of hardware to own anyway. Thanks all, I'll update when I receive

Great, thanks 6502. It's a bit pricey but this looks like what I need, Thanks

Thanks mraroid. I am well aware of the use of jumpers, but no termination jumper exists on this particular block. Rather, the documentation says it should be closer to the SCSI connector (top right of the photo). I just can't find it

Yes, that's the PCB. Looks like the block of jumpers in the front are for SCSI address, LED(out), and Autospin. The layout says that the terminator jumper should be in the back, near the 50pin SCSI connector. I just can't find it.

Thanks techknight. I looked really hard and could not find a termination jumper on the drive PCB, and online documentation for this particular drive is of no help. . What does the termination resistor pack look like ?