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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 ?

I have a Color Classic that had a dead Conner 80MD hard drive. I was trying to replace with an IBM WDS-L160. Everything works OK when an external drive is also connected, and the system boots flawlessly from the new IBM drive. But when I disconnect the external drive, the system does not...

I thought I'd post this here to perhaps help some. I have a Classic II which worked OK, but with only a faint sound. So I thought I'd recap, but only those caps I guessed were involved in sound. Started with C11, C12, C14 and C15: no help Then C9: no help After I changed C4 (47uF), I finally...

OK, I'm afraid the news is not good. I had previously swapped the ROM with one from a good board, with no effect. I then thought that the ROM was not the problem. But when I put the ROM from this board into the good Classic, I get checkerboard too, which tells me that the ROM IS bad, but...

And here is one data line signal. There is something, but my limited knowledge fails to tell me if it's OK.

Hi Bibilit: I hope to catch you before the end of the day in Paris. All my siblings are there and they're starting to lose patience with the shelter in place. But anyhow, thanks for your help. I finally got to hook up my scope, and get the clock and reset signals. Looks like clock is OK. I...

Sorry bibilit, I realize that my thread is somewhat confusing. When I tested the AB, I was using a good LB from another Classic. Once the AB was OK, I put the original LB in, and this is when I lost the chime/bong and the checkerboard issue came up. Sorry for the confusion. So I do not have the...

Yes, I swapped the ROM chip with one from a good board, but no effect. I also put the LB in a wash cycle in the dishwasher, and I get the same pattern.

Yes LaPorta, the LB was recapped. How do you reseat the RAM chips ? Looks like the internal RAM chips are soldered on. Interesting that you mention the RAM though, as I notice that the checkerboard pattern is different if I do not insert the external RAM module (left image), or even with two...

Update today. I have received the TEA2037A, and swapped it. Alas, no luck and the horizontal line was still there. I suspected that the flyback transformer could be the culprit, so I swapped it with one taken from a good board. No luck either. Upon examining the board one last time and...

Thanks dochilli. Will try and replace. Can the flyback transformer somehow be involved too ?

Yes joshc, I'm collecting interesting tidbits from the people on the photos, and will report. Thanks Dog Cow for the mention of the QuickTime slideshow. I couldn't find much about this on line. Is this available on the Compact Macs ?

Yes, AFAIK, the screens are the same between an SE and an SE/30

Update: I was able to contact Marjory Kaptanoglu (second image). She has changed career and is now a novelist. Her website is here in case you're interested. She was able to identify one more person as Brian McGhie (first photo, second from top left). By the way marcelv, I sent you a PM. Did...