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fri0701

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  1. fri0701

    Sun20 Hard Drive

    Here's some photos of the drive - I wanted to take a video of it spinning up, but my 1.8A Lisa PSU decided to bite the dust today. Time for a re-cap project!
  2. fri0701

    Sun20 Hard Drive

    It's a MiniScribe 8425, I think. I'll try to take some pictures some time in the next few days and post them here!
  3. fri0701

    Sun20 Hard Drive

    Ah, that clears a lot up! Thanks for the tip. I tried the drive in my 2/5, using the parallel port connection on the back of the machine and the upper drive connector for power. I get the same results as when testing with the 2/10.
  4. fri0701

    Sun20 Hard Drive

    Is there an easy way to tell which is the correct orientation for the parallel cable? I did notice that the cable doesn't have a notch, so like you said, it's a bit confusing. When I turn on the Lisa with the drive connected, the drive spins up, the head stepper motor looks like it travels its full range, then the full range back, and then a solid red light comes up on the drive. The drive still doesn't show up as a boot option. If I press Apple-3 to select it anyways, it looks like maybe the stepper motor moves just a hair, and then the Lisa promptly gives an Error 85. A couple days ago, this drive gave no sign of life when I plugged it in the same way. I moved the stepper motor by hand just a tiny bit, and it felt like it was stuck in place when I went to do that. After "unsticking" the motor, now the drive will spin up. For a while, it was giving me a "1101" error with its flashing light, which apparently corresponds to a "Seek error during burn-in or recal" error on this model of drive. However, this seems to have cleared up after further use.
  5. fri0701

    Sun20 Hard Drive

    Hi Rick, Thanks for your reply. I'm trying to use this drive with a 2/10, so there is no parallel port on the back of the machine. I was under the assumption that I could use the Widget drive connector in the card cage bay, since I believe that cable is an internal parallel cable on the 2/10. Does that sound correct?
  6. fri0701

    Sun20 Hard Drive

    I'm trying to get a Sun20 Hard Drive working in my Lisa 2/10, but I'm having some issues. The drive will spin up, and get to a solid red light (seemingly indicating it's "ready"), but it isn't shown in the boot selection dropdown. If I type Apple-3 to attempt to boot from it, I get an error 85 "drive can't keep up". Does anyone have experience with using this drive that can give me a few pointers? I tried to look around for a manual, but couldn't find much. Thanks!
  7. fri0701

    PB 165c Monitor Cables

    I'm trying to fix two PowerBook 165c computers that have torn internal monitor ribbon cables. Sadly, I realize this seems to be a relatively common issue, but I was wondering if any other PowerBook models share the same ribbon cable as the one used in the 165c. Also, does anyone know of any modern replacement cables that would fit? Besides being a strange shape, I'd imagine a similar cable might exist that would do the trick in a pinch. Thanks!
  8. fri0701

    Vintage Mac Safety

    Also, safety aside, keep in mind that leaving a CRT on for long hours showing the same screen is never a good idea for the health of the machine.
  9. fri0701

    Macintosh 128k boot problem on floppy.

    If you're sure the drive's read head is clean, you might want to check out replacing the Bourns Filters on your logic board. This problem seems similar to yours - maybe it can lend you some insight into your problem: https://68kmla.org/forums/index.php?/topic/22419-m0001-floppy-drive-problems/
  10. Great job! It's always great to see one of these come back to life.
  11. fri0701

    Apple /// Problems

    UPDATE: Looking at the voltages on the 6502 processor, something doesn't seem quite right. The address lines look like clean square waves, but they are only about 3.5-3.7V peak-to-peak. The data lines look very distorted and jumpy. The clock signal on pin 37 is only running at ~1MHz, and also is around 4V peak-to-peak. The Apple III should run at 2MHz, and transition to 1MHz when the processor is reset. However, it seems mine runs at ~1MHz, and doesn't transition when the processor is reset.
  12. The Lisa stores its information about its serial number (for use in copy protection) in the Video ROM (C6 on the CPU board). I don't know what would be causing your error if you haven't replaced the CPU board or that chip specifically, but there is a command you can run from within service mode where you can see the serial number the Lisa "thinks" it has. Maybe you can try checking that and see if it matches with the number on the case? Information here about querying the serial number: http://www.applefritter.com/content/apple-lisa-serial-number-info -fri0701
  13. fri0701

    Lisa needs some CPR

    It's important to note that although the Lisa will complain about not having a keyboard, it is not required, and the system will still boot. You'll hear any error beeps / see any error codes about 3 seconds after the Lisa notifies you there's no keyboard attached. - fri0701
  14. fri0701

    Lisa needs some CPR

    If you've got a 2/10, your Plus mouse should work without any modification of the connector. Here's a site with all the Lisa schematics, including the PSU: http://lisa.sunder.net/cgi-bin/bookview2.cgi?zoom=0?image=0?book=6 The Lisa PSU has a small hole on the side that leads to a potentiometer for varying the output voltage. Be careful if you play with this! I'd suggest unplugging the Widget entirely until you can verify the power supply is working, since adding a load like a drive might influence your measurements and results. At least the 2/10 never had the infamous batteries that kill so many Lisas. The normal Lisa boot cycle goes as follows: Power button is pressed, and power switch light goes on. A faint whining noise may come from the power supply. ~3 seconds later, a "click" is heard ~15-20 seconds later, two "clicks" are heard in short succession If there is no keyboard connected, you will hear beeps in the pattern: 2 high, 1 low. A keyboard with a question mark will appear on the screen. If there is no boot media, or it cannot be booted from, you will hear beeps in the pattern: 3 high. An "no boot" error code will appear on the screen. If the Lisa encounters any problems during its self-test power up, it will display an icon and an error code (if it's able to get that far, that is). The icons and error codes can be interpreted using this (page 19): ftp://ftp.apple.asimov.net/pub/apple_II/documentation/applelisa/Lisa_Do-It-Yourself_Guide.pdf Feel free to PM me if you have any specific questions - always happy to help resurrect a Lisa. Good luck! - fri0701
  15. fri0701

    Apple /// Problems

    Hi everyone, Well, once again, I'm back to attempting to fix this stubborn ///. I've made some progress, and I'm hoping someone experienced enough can recommend what I should try next. I've caved, and purchased a Reactive Micro Universal PSU and installed it in the ///, with no change. At least now I can be definitely sure that the power to the system is clean and functional. All voltages check out. I also (finally) got my oscilloscope up and running, and probed some chips based on this guide: http://www.willegal.net/appleii/appleii-repair.htm The 6502 CPU is running correctly, it seems, with the reset pin jumping to high as I start the system. The reset pin jumps to low and back to high whenever I push Control-Reset on the keyboard, which is a good sign. I can see activity on the various address and data lines, as well. My RAM chips are new, and I doubt they're the problem. I've tested the Vcc supply on all chips, and they are all at the correct voltage. However, my screen is still a flashing mess of jumbled characters. When I remove the 5V RAM board from the system and turn it on, the screen is solid white. Is anyone here experienced with digital logic troubleshooting, who can guide me through where to check next with my scope? I unfortunately don't have any spare chips to swap and try here, although I do have some spare Apple //es that I could harvest from, and I could definitely order replacements if needed. I'd really appreciate any help to finally resurrect this beast! - fri0701
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