• Re: My A2K died :

    From Neil Williams@2:250/607 to DENNIS SMITH on Thu Sep 18 10:20:22 2003
    Hi,
    On Monday September 15 2003, Dennis Smith said to NEIL WILLIAMS:

    I think we can say that at least your CPU is working (the blinking
    power LED).
    I even checked with a meter with 4.5 to 5 volts;same on KSrom. It's
    pin#31 on both chips. So, who signals the CPU to do its jmp start
    vector? KSrom was swapped to a good one-- no change. BTW, this A2K was

    The CPU, AFAIK, starts reading from zero on whatever it is connected to, so it effectively control itself.

    Well, I would like to determine a component/device first. Let's look at that CTRL+(L)Amiga+(R)Amiga. What's the eletrical equivalent of these keystrokes? How is a reset carried out by a device. When I turn on the

    The reset is by software, at least on the keyboard controller side. Amigas like the 1200 (and I'm sure 2000, but can't remember!) also control the keyboard reset by software on the CPU side.

    Hence, it's the power LED you want to see blink when you reset by C-A-A. If it doesn't blink the problem is in the area of the CPU (when my original CS-PPC died, the LED never blinked and acted the same whether the 4000 had the failed CPU card installed or not at all!).

    A2K, what events & devices actually tell KS to jump to Startup?

    When the CPU gets a reset signal, it begins to read from zero at the ROM. That's all that happens, nothing magic. But there's a million & one things which happen next.. god knows what though..

    CIAs around (there are two) didn't change anything. Normal is to read a one flash 'caps lock' light at startup and I get that. I'll check this
    one out after shut down.=:D

    Yes, but that's handled by the keyboard controller chip - which is independant of the computer (try powering the keyboard seperately from the computer and you'll get the same thing). It does indicate that the keyboard is either sending or receiving a reset signal.

    It's the power LED you want to see flash. Even a perpetual guru would be a start :)

    I was there the other night and could not find their repair policy;
    read it a long time ago. They may have dropped the service! Oops, time
    is not looking good for the old Amigas.

    If you determine that the fault is on the motherboard, and everything else is fine, get another 2000. They go for very little on eBay. You can even then sell the broken one to get some money back (people will buy any old crap on eBay ;-)


    --
    Neil Williams, neil@zeusdev.co.uk - Uni, ug00026 at sees bangor ac uk
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  • From DENNIS SMITH@1:120/228 to NEIL WILLIAMS on Sun Sep 21 15:44:00 2003
    At 10:20 AM on 18 Sep 03, Neil Williams said to Dennis Smith:

    Hi,
    ...
    The CPU, AFAIK, starts reading from zero on whatever it is connected to,
    so it effectively control itself.

    Well, I would like to determine a component/device first. Let's look at that CTRL+(L)Amiga+(R)Amiga. What's the eletrical equivalent of these keystrokes? How is a reset carried out by a device. When I turn on the
    ...
    The reset is by software, at least on the keyboard controller side.
    ...
    Hence, it's the power LED you want to see blink when you reset by C-A-A.
    If it doesn't blink the problem is in the area of the CPU (when my
    original CS-PPC died, the LED never blinked and acted the same whether
    the 4000 had the failed CPU card installed or not at all!).

    Right now, I'm not getting no reset or any change in the power LED.
    It seems to me that a hardware RESET causes the power LED change. That's
    the circuit that needs checking.
    [...]
    It's the power LED you want to see flash. Even a perpetual guru would be
    a start :)

    =:o "...perpetual guru..."! Actually the KS bootup screen qualifies with
    it's graphical perpetual floppy disk going in the drive. I'm trying
    to get to that point! It's CPU or it Set/Reset circuit with new KSrom.


    If you determine that the fault is on the motherboard, and everything
    else is fine, get another 2000. They go for very little on eBay. You can even then sell the broken one to get some money back (people will buy
    any old crap on eBay ;-)

    The A2K we're dicussing came from E-Bay for exactly that purpose - backup! Since my PPS ZEUS won't upgrade to OS3.1, so the backup was used. Worked
    damn good for about a year+. :)

    I trying to decide which system to continue with KS2.05 & WB2.1 or KS3.1 & OS3.9. Which is the more classical?

    The AmigaOne is setup for OS3.1. I fiddled the Emergency-Disks Startups
    to boot the CDs either OS3.5 or OS3.9 in UAE. :) So, I not a crisis of
    being without an Amiga. Now that's poor when your Amigaless! =:o

    I would like to spend time & resources on AmigaOne. That's why I got it!!
    Can you recommend a SCSI contoller for the A1. They're not cheap, but it's difficult to determine what works with linux? Someone mentioned that even
    if I had SCSI, linux UAE doesn't have the UAESCSI driver like WinUAE. So,
    that crinkles that plan.

    The Frieden brothers are back talking in the AmigaWorld.net forums! OS4 is
    just around the corner! They're short a graphic.libraries rewrite from
    booting up OS4 on AmigaOne PPC native. Sounds good! :)

    :Dennis

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  • From David L. Stevens@1:3613/44 to All on Tue Sep 23 10:15:10 2003
    DENNIS SMITH wrote:

    At 10:20 AM on 18 Sep 03, Neil Williams said to Dennis Smith:

    Hi,
    ...
    The CPU, AFAIK, starts reading from zero on whatever it is connected to, >NW> so it effectively control itself.

    Well, I would like to determine a component/device first. Let's look at that CTRL+(L)Amiga+(R)Amiga. What's the eletrical equivalent of these keystrokes? How is a reset carried out by a device. When I turn on the
    ...
    The reset is by software, at least on the keyboard controller side.
    ...
    Hence, it's the power LED you want to see blink when you reset by C-A-A. >NW> If it doesn't blink the problem is in the area of the CPU (when my
    original CS-PPC died, the LED never blinked and acted the same whether >NW> the 4000 had the failed CPU card installed or not at all!).

    Right now, I'm not getting no reset or any change in the power LED.
    It seems to me that a hardware RESET causes the power LED change. That's
    the circuit that needs checking.
    [...]
    It's the power LED you want to see flash. Even a perpetual guru would be >NW> a start :)

    =:o "...perpetual guru..."! Actually the KS bootup screen qualifies with
    it's graphical perpetual floppy disk going in the drive. I'm trying
    to get to that point! It's CPU or it Set/Reset circuit with new KSrom.


    If you determine that the fault is on the motherboard, and everything
    else is fine, get another 2000. They go for very little on eBay. You can >NW> even then sell the broken one to get some money back (people will buy
    any old crap on eBay ;-)

    The A2K we're dicussing came from E-Bay for exactly that purpose - backup! >Since my PPS ZEUS won't upgrade to OS3.1, so the backup was used. Worked
    damn good for about a year+. :)

    I trying to decide which system to continue with KS2.05 & WB2.1 or KS3.1 & >OS3.9. Which is the more classical?

    The AmigaOne is setup for OS3.1. I fiddled the Emergency-Disks Startups
    to boot the CDs either OS3.5 or OS3.9 in UAE. :) So, I not a crisis of
    being without an Amiga. Now that's poor when your Amigaless! =:o

    I would like to spend time & resources on AmigaOne. That's why I got it!!
    Can you recommend a SCSI contoller for the A1. They're not cheap, but it's >difficult to determine what works with linux? Someone mentioned that even
    if I had SCSI, linux UAE doesn't have the UAESCSI driver like WinUAE. So, >that crinkles that plan.

    The Frieden brothers are back talking in the AmigaWorld.net forums! OS4 is >just around the corner! They're short a graphic.libraries rewrite from >booting up OS4 on AmigaOne PPC native. Sounds good! :)



    Have you tried cold-booting from a bootable floppy? Could be your hard
    drive is locked up and you're
    only seeing a dimmed power led.


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