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quorten

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  1. quorten

    The 2020 Experience

    My Macintosh SE with System 6.0.7 correctly recognizes the year as 2020. Interesting that the newer system software has that defect, you'd think it would be the reverse.
  2. quorten

    Macintosh SE Clock Battery Mod

    @Crutch Nice! Glad my post was inspiring. The surrogate battery is quite a nice way to do battery mods. (I wish I got the notification earlier... the forum must have been quite busy this time of year.) Thinking about the possibilities for Macintoshes that were not manufactured with the 1/2 AA battery holder, the ideal modification would probably be to put the 1/2 AA battery holder in place and do the surrogate battery mod if you so wish. But for me, this was pretty much my first vintage hardware mod that involved soldering. And, the method of soldering to the old battery leads left over from the clipped-out battery was least invasive.
  3. quorten

    Macintosh SE Restoration

    For 1/2 AA batteries, I would probably prefer the lithium manganese dioxide ("CR") chemistry over lithium thionyl chloride when available. Although I did find one source online, I was hoping to be able to order the battery together with other components from the same supplier/store. The standard/common chemistry for 1/2 AA is okay if you're careful. But, if you have a preference for certain battery chemistries, it seems the best way is to do one of the retrofit mods to allow the use of a more common battery size. Also, seeing the "Maxell bomb" damage photos, well I figure those must have been something like a lithium thionyl chloride battery with a missing/failed fuse that causes them to be so destructive. Maybe their only failing was their fuse, a problem not replicated across other manufacturers of the same chemistry.
  4. quorten

    Macintosh SE Clock Battery Mod

    The Apple Service Manual 3 V threshold is definitely a precautionary measure, the soldered-on VARTA 1/2 AA 3.6 V Li battery I removed from the motherboard must have been the original installed over 30 years ago. I've had this Macintosh SE for a while, and 10 years ago the clock tended to fall behind by 1 hour after a few weeks. Then the clock ticked slower and slower until it stopped ticking at all when powered off some time around February earlier this year. When I measured the in-circuit battery voltage before removal, it was something like 0.56 V. Not until after I removed the battery did my PRAM settings get reset. I was amazed the battery would do anything at all at such a low voltage. So I figure that there is a pretty low operating threshold on the clock circuit, with the main effect on the clock that it will gradually run slower and slower until it stops ticking. The PRAM has an even lower operating threshold than the clock. Sure thing, though for this project as I see things it's pretty much complete as-is. Another idea to entertain for other compact Macs is that the PDS slot can also be used for routing an external connection for the clock battery. My expansion card happens not to use all pins on the DE-9 connector, for example. But, for the time being, I am more than taunted by simply trying to get drivers for the card, Megascreen 3, to work.
  5. quorten

    Macintosh SE Clock Battery Mod

    Yeah, the original battery was 3.6 V 1/2 AA Li. The SE works fine with the 3 V coin cell battery. The clock circuit appears to be fairly robust with low voltages, I believe lower voltages below 2 V cause the clock to start running too slow and down to 1 V the clock doesn't tick at all when the computer is off, but the PRAM can still be preserved at such low voltages. That being said, time tracking appears to still be pretty accurate at 3 V, one week after the replacement I don't see any signs of the clock running two slow.
  6. quorten

    Macintosh SE Restoration

    Impressive restoration skills, I am but a novice when it comes to working on compacts Macs. I see you're using a 1/2 AA battery socket. Do you happen to know the kind of battery chemistry of the replacement battery you used? For 1/2 AA batteries from my searches, there doesn't seem to be as many choices on battery chemistry and lithium thionyl chloride seems to be the most common chemistry. Alas, that particular battery chemistry appears to have risks that the others don't have.
  7. quorten

    Radius SE 2.1 ROM Dump

    Cool, I'd like to imagine an interesting modern use for that. The Radius cards sure do seem to be the most popular to have comprehensive information on them. My Macintosh SE has a Megascreen 3 video card that does without ROM chips and relies entirely on software drivers to set it up. Unfortunately, the original owner didn't give us a copy of the drivers when it was bought/sold in 1997.
  8. quorten

    Macintosh SE Clock Battery Mod

    Recently, I've made a modification to my Macintosh SE to clip out the soldered-on 1/2 AA battery that was near the end of its life and soldered a pin header in its place. From there, I attached a cable and routed the other end to an easy to reach place in the back right side of the Macintosh SE. The clock battery is attached via another pin header to the battery holder, and also stored inside a small cardboard box. Figuring out how to mount the box was a bit of a challenge, but pretty soon I settled on using some tape to secure it to the back of the chassis, and the cables to the external PDS expansion connectors also seem to help hold it in place. Pretty cool, I made it modular with pin headers so that I can have my choice of what kind of battery to plug in, which is right now a CR2032 battery. Works like a charm. No need to go hunting around for a 1/2 AA battery and worrying about the caustic chemicals that might leak out of it when it expires. I also have enough length to route the cable outside the Macintosh through the security cable connector cutouts if I so wish.
  9. quorten

    Killy clips

    Looks like there are a few places to get IC clips in the correct geometry. This is what I found: Digi-Key search results. Digi-Key shows a minimum quantity of 10.
  10. quorten

    .dsk raw floppy format?

    Hi maz, for serial transfers I use ZTerm 0.9 on the Macintosh side and the X/Y/ZMODEM protocol. ZTerm will automatically pack/unpack MacBinary files which makes it a breeze to transfer applications. I sent ZTerm over to the vintage side via a floppy disk image. I found some readymade 1.44 MB disk images containing ZTerm and other free/shareware networking software here: https://www.jagshouse.com/internet_on_system_6.html For my purposes I needed to repack ZTerm into an 800K disk image.
  11. quorten

    .dsk raw floppy format?

    Another emulator to consider, may be easier to setup than BasiliskII: https://en.wikipedia.org/wiki/Executor_(software) More info on working with ".dsk" images: https://www.gryphel.com/c/image/ For transferring files to a vintage Mac using SD... getting the HFS volume may only be part of the process. If your SD emulates a floppy disk, that should be all that is needed. However, if it emulates a hard disk (i.e. SCSI2SD), you also need the Apple Partition Map.
  12. quorten

    .dsk raw floppy format?

    I transfer files from modern PCs or Raspberry Pis (I don't have modern Macs) to classic Macintoshes via serial connection, to state it succinctly. Typically I have also used the emulator method for creating raw disk images on a modern computer. I've also used old Linux virtual machines to manipulate .dsk image files, sadly support for resource fork access was removed from modern Linux. Apparently macOS went down the tube also by dropping support for creating new resource forks. On macOS, I believe you can try Disk Utility > Open Disk Image, and you should be able to access the HFS volume inside the .dsk image file for creating and editing files. Or via Terminal, "hdiutil mount floppy.dsk". I believe the Disk Utility tool and other command line tools provide methods for creating HFS disk image files too, which is the same as ".dsk" if you set the capacity and size accordingly.
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