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Type: Posts; User: groink

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  1. Replies
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    321

    My money is on injection molding. John says he...

    My money is on injection molding. John says he had to make multiple copies of the case. If he produced these in any other way, he could have done one-offs instead.
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    152

    I'm extremely over-simplifying things here, so...

    I'm extremely over-simplifying things here, so apologies to those who want/know the details....

    In short, don't think of expansion slots as "slots." Think of them as memory locations. Slot 1...
  3. Disk Drive Analog Cards- One Better Than the Rest?

    Curious question.... Several Apple II drive manufacturers used the same Shugart SA390 mechanism as Apple's Disk II. I've listed below disk drive analog cards from the following companies: Apple,...
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    308

    Even if the box is functional, the X-Press...

    Even if the box is functional, the X-Press service is no longer available, as the Internet replaced the need for it. However, the box itself might be an interesting study on how cable TV channels are...
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    308

    This is a cable modem, but not the cable modem...

    This is a cable modem, but not the cable modem most of us use today. In the early to mid 1980s, news and information used to be transmitted through the (once was the) analog cable TV system. Digital...
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    265

    Look for "Fairy" IC tester for the Apple II....

    Look for "Fairy" IC tester for the Apple II. They're the exact same thing.
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    707

    The function of S2 has something to do with pins...

    The function of S2 has something to do with pins 6, 7, 9 and 10 data output pins on the encoder chip. Normally, pins 9 and 10 connect to inverters (74LS04 on the encoder PCB,) which is then fed to a...
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    707

    There are two switches on the encoder board,...

    There are two switches on the encoder board, labeled S1 and S2. S1 switches between CTRL-RESET and just RESET. S2 - I never understood what this switch does. Most encoder board never had S2...
  9. Replies
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    707

    I've seen this type of power light on the...

    I've seen this type of power light on the "version 2" keyboards.
  10. Replies
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    738

    Seeing you mentioned the Floppy Emu, did you run...

    Seeing you mentioned the Floppy Emu, did you run across this article: https://www.bigmessowires.com/2014/03/28/troubleshooting-damaged-chips/
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    738

    I don't have a direct answer to the question at...

    I don't have a direct answer to the question at hand. In my experience with IBM "AT" power supplies, the +5VDC rail required a minimum of 2 to 4 amps. And I anticipate the same goes with the Apple II...
  12. Replies
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    392

    For those of you following at home, I'm starting...

    For those of you following at home, I'm starting to get the clone terminology down..... The board I have is a GTAC-2, or "Generic Taiwanese Apple Clone, version 2." So if anyone has the schematic...
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    392

    This logic board is extremely unstable. I'm...

    This logic board is extremely unstable. I'm certain there are loose solder joints throughout the board. Just tapping on the board lightly resets the board.

    As for the memory tests, even the...
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    392

    I'll give that monitor test a try. I saw that...

    I'll give that monitor test a try. I saw that earlier, but assumed it was just for the Apple II/II Plus, as the board that I have has 64K.
  15. Replies
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    392

    Troubleshooting Apple II Clone "ABC"

    As if I needed a challenge....

    I have an Apple II clone logic board. It is one of your average logic boards that uses a ROM card/slot, 6502 and Z80 processors onboard, and 64KB RAM onboard (eight...
  16. Replies
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    268

    There are several versions of the Apple II...

    There are several versions of the Apple II keyboard. Which version do you have?

    http://www.willegal.net/appleii/early-a2-keyboards.htm

    If your keyboard has a separate keyboard encoder board,...
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    9,304

    If you have a ROM card with the Apple...

    If you have a ROM card with the Apple Programmer's Aid ROM, you can use this ROM to perform a memory check. I've used this a few times to troubleshoot memory problems.
    ...
  18. Replies
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    765

    Well, I went with my original hunch and replaced...

    Well, I went with my original hunch and replaced the electrolytic caps (5 of them) around the DIMM slot area. Fixed the memory errors! And XP boots now. Combination of 1500uF and 3300uF caps - not...
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    765

    You didn't read a word I wrote on that post, did...

    You didn't read a word I wrote on that post, did you?
  20. Replies
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    765

    Windows XP Home. It was able to boot into the...

    Windows XP Home. It was able to boot into the desktop when I first got the computer. The HD is original and still has the recovery partition.
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    765

    HP/ASUS A7N8X-LA - Repairing

    Hey, guys!

    I was given an HP Pavililion. It has an ASUS A7N8X-LA motherboard, with 512KB DIMM and the original hard drive and OS.

    First thing I did was restore the original Windows XP operating...
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    Just curious.... Is there a "dark Internet"...

    Just curious.... Is there a "dark Internet" trading for computing collectables, such as Apple-1's? I can see them selling Van Gogh paintings and such.... But I can't see rare computers being sold...
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    https://www.onlinecomponents.com/switchcraft/35rap...

    https://www.onlinecomponents.com/switchcraft/35rapc2av-12319093.html
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    Most definitely, the problem with the keyboard...

    Most definitely, the problem with the keyboard are the switches themselves. I just checked my schematic for the keyboard, and all the keys you mentioned are on separate paths to the encoder chip, so...
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    Research Nishida Radio's SDISK II. He's published...

    Research Nishida Radio's SDISK II. He's published the source code. It uses the Atmel ATMEGA328P, although the SDIsk II requires a 27 MHz crystal which the Arduino does not have.
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