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Type: Posts; User: Neo-Rio

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  1. Replies
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    The screen shaking only happens when the display...

    The screen shaking only happens when the display is in some graphic mode. No problem when the screen boots and I get the Apple //c screen or Basic prompt.
    The screen shaking starts up during a self...
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    Replaced the keyboard encoder chip with a new one...

    Replaced the keyboard encoder chip with a new one and viola.... the keyboard comes back to life.

    Now for the shaky display. It seems to be flipping between colour and B/W modes out of control. Any...
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    As mentioned, I did get the correct voltages off...

    As mentioned, I did get the correct voltages off pins 27 and 30 on the keyboard decoder chip.
    However pin 16 is getting nothing, even after keyboard presses.

    The question then becomes.... is the...
  4. Replies
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    Well, the leftmost pin of the 7905 is getting...

    Well, the leftmost pin of the 7905 is getting nothing at all.
    The middle pin is getting -11.85V


    Perhaps I should be looking at the input pin of the keyboard encoder?
    I measured pin 27 on that...
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    Where do I check for these? The 5v should be off...

    Where do I check for these?
    The 5v should be off that 5v regulator near the keyboard encoder, right?

    I am getting a little over 5v on the rightmost pin of that 7905 regulator... so it seems OK to...
  6. Replies
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    It's a PAL unit. I'm actually connecting the...

    It's a PAL unit. I'm actually connecting the video through composite to TV. Color works fine when I do this with my apple IIe. The IIc stays black and white, and judders when graphics is on the...
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    Well, you can eliminate possibilities by...

    Well, you can eliminate possibilities by socketing and replacing chips as you go. :)

    That garbage screen looks a little different to a CIA failure however. You actually get discernable characters...
  8. Replies
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    Apple IIc keyboard and display issues

    Recently brought an Apple IIc back from the dead with a new power regulator chip, but now I have a few new problems.

    Essentially, the keyboard allows me to do control+apple+reset and reboot the...
  9. Replies
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    2,454

    Removed the old chip, soldered in a socket, found...

    Removed the old chip, soldered in a socket, found a replacement NEC chip and dropped it in, and hey presto! It boots!

    Also passes "System OK" test, however there are still some issues with the...
  10. Replies
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    It's more likely to be a dead CIA chip at U2....

    It's more likely to be a dead CIA chip at U2.
    Can you blindly load up a game or cartridge? Does it "play" except fir the garbage on screen?
    If so, then it's the CIA
  11. Replies
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    I tried retrobrite on my Apple IIe and it ruined...

    I tried retrobrite on my Apple IIe and it ruined the case.
    Bleached it in areas, and the spacebar turned white and ugly.

    Do NOT retrobrite the IIe (and earlier)... I don't believe they have fire...
  12. Replies
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    ...and I'm not getting 5V on pin 14 I'm only...

    ...and I'm not getting 5V on pin 14
    I'm only getting 1.6v when switched on and 0.6 when off

    Might try and find myself a replacement chip and see if that helps?

    Is a UA494 or a TL494 16 pin...
  13. Replies
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    I'm not sure which pins were the supply and vref...

    I'm not sure which pins were the supply and vref pins (I'm no good at reading schematics) , but I tested pin 8 and 12 on the UPC494C chip and found that I could get 18VDC off of them.
  14. Replies
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    Not getting 5v on either that chip or the 7905.

    Not getting 5v on either that chip or the 7905.
  15. Replies
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    If true, where's a good place on the mainboard to...

    If true, where's a good place on the mainboard to use the mulitmeter to check for a good voltage?
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    Mine looks completely different. Perhaps a later...

    Mine looks completely different.
    Perhaps a later revision?

    Again, I don't know what voltage the part runs at in order to find something comparable.

    30167

    The regulator part is Q1 - but the...
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    Apple IIc power issues

    I'm trying to repair a IIc that seems to be dead on arrival. Turn on switch, nothing happens. No lights, nothing.

    So far I've determined that the power supply works. It's getting a solid 18V DC...
  18. Nope it didn't help. socketed and replaced the...

    Nope it didn't help.
    socketed and replaced the four chips, but it's still not booting anything.
    Drive is probably out of alignment, or the TEAC mechanism is broken somewhere in it's circuitry.
    ...
  19. Trying to transfer a disk over ADTPro. I can see...

    Trying to transfer a disk over ADTPro.
    I can see the PC directory with the disk, but it gets about 4 blocks in and hangs.
    Rescanning the drive gets <IO-ERROR> listed instead of the format label I...
  20. I've got loads of disks to test from. I'm...

    I've got loads of disks to test from.

    I'm currently trying to get ADTpro to work.
    I managed to bootstrap the apple over audio, and then tried formatting a blank disk from it.
    The drive seemed...
  21. Here's a photo of the inside of the unit that was...

    Here's a photo of the inside of the unit that was working for a bit and then died.
    The apple II part of the controller is very simple, and I will probably have a better chance of fixing this one.
    ...
  22. Well, I found the 74LS245 chip and replaced it...

    Well, I found the 74LS245 chip and replaced it with a brand new one!
    Whaddaya know? The drive controller is now being detected!
    So the chip was dead, obviously.
    Also, my old controller is also...
  23. Tried the first one. It listed memory all the way...

    Tried the first one. It listed memory all the way to BEFF
    The second one seems to have hung the machine, but there is no screen output, so I can't tell.



    I have a PAL Apple IIe, so the...
  24. Removed the ROM Flashed a new ROM Inserted new...

    Removed the ROM
    Flashed a new ROM
    Inserted new ROM
    Apple IIe boots, but disk controller still doesn't work
    Removed ROM
    Powered on without any CD ROM - I get no beep and a screen full of...
  25. If so, is there an image of the C1-DF ROM that I...

    If so, is there an image of the C1-DF ROM that I can burn to eeprom?

    Mind you, my Apple IIe is non-enhanced, so I suppose I would need the non-enhanced ROM image.
    The CD ROM label I have is...
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