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Thread: Valuable / Collectible Early Mac's

  1. #11
    Join Date
    Jan 2013
    Location
    Marietta, GA
    Posts
    2,070

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    Quote Originally Posted by zombienerd View Post
    Is there any way to clean the discs without damaging the material?
    It depends on what your objective is.
    If you are purely looking for data recovery, chuck's method is the most professional, and ensures the best results.

    But if you have a non-unique, but collectible, factory original software disk, you might not want to cut it up.

    5.25" disks are fairly easy to clean out. I just run hot water (no hotter than you can touch) in around the central hub. Left, right, front, back all about a minute or two. If done carefully, it is possible to avoid getting a label wet. Areas with very high mineral content might consider following up with some distilled water.

    The main trick is getting it dry. I carefully prop up the jacket around the hub with q-tips, and place it in front of a fan in a clean dry place. Be careful not to put too much pressure on the cookie with the q-tips or you can dent it or cause it to stick to the jacket lining.

    Once dry, visually inspect while manually rotating the cookie. If any spots remain, address them with a q-tip.

    I'd avoid using alcohol as that tends to discolor the surface, and can wind up removing oxide when there is a small scratch or existing flaking. But sometimes really tough junk requires using alcohol.

    3.5" disks are more difficult to clean. There is no good way to get them dry. If just opening the shutter and wiping the surface with a q-tip isn't enough, then the the only option is removing the cookie.

    Even if the disk becomes fully readable, you probably won't want to rely on or re-use such poorly stored disks. You will want to hunt down some unused floppies from eBay. (Or wuss out and get some kind of floppy drive emulator :P )

  2. #12
    Join Date
    Apr 2006
    Location
    Portsmouth, Va
    Posts
    241

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    As far as value, Even though SEs and Pluses aren't as valuable as the others, they're still fun little machines to restore and play around with.

  3. #13

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    They're not valuable, per se, but they're great machines. The Plus is nice because it's the last of the original style Macintosh computers, just more convenient. Has a SCSI port which makes using it a lot easier, and actually has enough RAM to run programs.

    SE is a great System 6 machine. A good transitional computer between "modern" 68k machines and the original Macintosh line. Useful for working with original Macintosh software and files and getting them onto modern machines.

  4. #14
    Join Date
    Apr 2015
    Location
    Austin, Texas
    Posts
    747

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    I wish I wasn't so poor as to get a working SE myself. I still have the upgrade board I pulled from my dead SE 20 years ago which gets it up to a 68030@25 MHz and 16 MB of RAM.

  5. #15

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    Quote Originally Posted by zombienerd View Post
    One of the Mac SE's has some sort of accelerator installed, and displays it on the boot screen, I should have written it down. I can hear a hard drive spin up, but it also just sits on the Floppy Icon with the Question Mark.
    I'm guessing its a Radius accelerator. I have one in my SE; the common one upgrades it from a 68000 to a 68020 @ 16MHz. There are others which upgrade to a 68030 but they are less common. Runs well and makes it much faster than a Classic; but less than an SE/30. While you get a decent speed boost it's kinda cancelled by the lack of ram though. The SE maxes out at 4MB whereas you can run ridiculous amounts in something like an SE/30 (around 128MB IIRC).

    Also don't forget to replace the PRAM batteries in the all in one macs. The SE's have them soldered on; however they still are prone to leak and damage the boards. You can either replace them with another soldered battery; or install a battery holder on or off board. Be careful if you install a battery holder on the board; the clearance between the board and chassis (and the accelerator) is extremely tight in an SE. You might end up fouling on something. Also note the SE came standard with a 3.0V Lithium battery (NOT the 3.6V used in the later models).

    The Plus also has a PRAM battery; but it's accessible from a panel at the rear of the case. It's a sort of AA sized thing; but slightly different. These can also leak and make a massive mess....
    System 80 Expansion Interface located! Thanks to all who helped out and the good people in the NZ vintage computer forums!

  6. #16

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    Quote Originally Posted by 3pcedev View Post
    I'm guessing its a Radius accelerator.
    Radius 16, indeed.

    Both SE machines appear to have had their batteries replaced at some point. Both are very clean, and test good. I might clip them anyway because I'm not sure how old they are.

    I'm still scouring for cheap boot media. I found a site online, but $10 for a boot floppy seems a little steep. If anyone would be willing to ship me a set or two of 800k floppies with 6.0.8, I'd be most grateful, and would throw a few bucks your way to cover media and shipping.

    Turns out neither SE had a HDD inside. The sound I swore was a HDD was just a loud fan. :/ One is labeled as a twin 800k unit, the other labelled as a single 800k + 20mb HDD (this is the one with the Radius). I did receive a 4.3gb Barracuda 4 drive with the lot; it either doesn't seem to have the OS installed, or I have it set up incorrectly. I'm not even sure how it's supposed to be terminated / jumpered to connect to the SE. It may have even come from a later machine. Do the SE's have a maximum HDD size? Would the 4.3gb drive even work in the SE? Maybe I'll luck out on my return trip and my contact will have found some more SCSI HDD's

    While playing around, one of the Plus units popped a large component on the power supply (appeared to be a resistor or inductor), I shut it off immediately after smelling the smoke. I'll get pictures later if anyone is interested. The funny thing is the machine was still running when I hit the switch.
    Current Vintage Equipment:
    IBM Thinkpad 390, IBM Aptiva A12, IBM PS/2 Model 25-004. Compaq Contura 4/25C.
    Asus P5A-B Socket 7 Box, Tandy 1000RLX-HD "B" & 1200-2FD, VIC20, Zenith ZFL-181-93, Packard Bell 300SX.
    Looking for: 286 Laptop, 386 Laptop, C64. Packard Bell Legend 20CD.

  7. #17

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    Yep, a line filter cap. They need to be changed, but it isn't that big a deal. Ask around and someone will tell you what cap it is. I could probably send you some 800k diskettes! PM Me

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