🚀 go-pugleaf

Tim Jackson wrote in message <384FB906.642E8FB3@cf.ac.uk>...

>I've had a look inside and there's no obvious visible damage (unlike in
>the modem where capacitors literally exploded) so I'm guessing the serial
>chip has gone.  Presumably (since it's all SMD) there's not much I can
>do?

You can always get a high-speed serial port. If you have a big-box Amiga,
get IOBlix or GVP's I/O Extender...

--
-------------------------------
Get rid of "mike-love" to reply via e-mail.

On Thursday, 09-Dec-99 around 08:13:26, Tim Jackson wrote, saying something about Serial port problems. My Reply is thus:

Hello Tim,

TJ> The other day a house about 50m away had a direct lightning strike to
TJ> it. This caused an induced surge on the nearby telephone system and
TJ> unfortunately this hit my modem line.
TJ> 
TJ> As a result, the modem connected to the line got fried. The PC connected
TJ> to the modem died. My Amiga, connected to the PC via a null modem cable
TJ> seems to be OK *except* that the serial port appears to be dead - I've
TJ> tried it with a modem borrowed from a friend (which works) and I can't
TJ> persuade it to do anything at all so I'm fairly sure that it is dead.
TJ> 
TJ> I've had a look inside and there's no obvious visible damage (unlike in
TJ> the modem where capacitors literally exploded) so I'm guessing the
TJ> serial chip has gone. Presumably (since it's all SMD) there's not much I
TJ> can do?
TJ> 
TJ> Assuming there isn't, does anyone know by any chance of anywhere that
TJ> repairs Amigas around the Cardiff, UK area?  Failing that I'll have to
TJ> send it off for repair to Analogic or someone similar.

Sounds to me like it might be one of the CIA chips got fried. Does the
printer not work as well? You don't say what type of Amiga you are using but
it doesn't really matter. All Amiga's use the same CIA chips (well maybe not
the A4000T). There are two chips, an ODD CIA and an EVEN CIA and they should
be marked on the motherboard silk screen. Try swapping them and if your
mouse stops working but the modem starts working it is a blown CIA chip.

Till next time...

-- 
Kevin Sherman
Email: BlitterEnd@yahoo.com
* Member Team AMIGA *
Amiga, nothing but the best A500, A3000

>> Presumably (since it's all SMD) there's not much I can do?


WRONG!!!  - But it takes a fair amount of special tools!!!

Which type is your Amiga?

Any specialised radio repair shop should be able to change the chip, and get
hold of a new one, EG via RS Components or Radioparts or Farnell or
something like that...

I changed my A4K Chip 3 (Three!!!) times, an has now installed a socket!
 Don't mess around in building little PAR controllable units unless ya know
how... )

And i'm just a standard Radio Mechanic and 'Ole Amiga Freak snc 86'

Good Luck...

Kevin Sherman wrote:

> TJ> As a result, the modem connected to the line got fried. The PC connected
> TJ> to the modem died. My Amiga, connected to the PC via a null modem cable
> TJ> seems to be OK *except* that the serial port appears to be dead - I've
> TJ> tried it with a modem borrowed from a friend (which works) and I can't
> TJ> persuade it to do anything at all so I'm fairly sure that it is dead.
> Sounds to me like it might be one of the CIA chips got fried. Does the
> printer not work as well? 

I don't have a printer so I haven't tried the parallel port yet.  I can
borrow 
one to try it with though, if that's relevant.  Haven't tried the gameport
either
since I don't have a joystick but I can swap the mouse into it and switch
the port
easily enough.

The floppy controller is definitely OK, as is everything else AFAICS,
including the
IDE controller.

> You don't say what type of Amiga you are using but it doesn't really matter. 

Oops.  It's an A1200.  Motherboard rev 1D IIRC.

> All Amiga's use the same CIA chips (well maybe not
> the A4000T). There are two chips, an ODD CIA and an EVEN CIA and they should
> be marked on the motherboard silk screen. Try swapping them and if your
> mouse stops working but the modem starts working it is a blown CIA chip.

I've heard about swapping them before but everything inside is surface
mounted; I
can't really swap them very easily...

-- 
           * - * - * - *    T i m  J a c k s o n    * - * - * - *
                     http://www.bigfoot.com/~tim_jackson
            DJ * Lighting tech * Student * Musician * Programmer
                      Arcline on IRC - * - Cardiff, UK

Dauber <dauber@wallnet.mike-love.com> wrote in message
news:s4vps18ifkb7@corp.supernews.com...
> Tim Jackson wrote in message <384FB906.642E8FB3@cf.ac.uk>...
>
> >I've had a look inside and there's no obvious visible damage (unlike in
> >the modem where capacitors literally exploded) so I'm guessing the serial
> >chip has gone.  Presumably (since it's all SMD) there's not much I can
> >do?
>
> You can always get a high-speed serial port. If you have a big-box Amiga,
> get IOBlix or GVP's I/O Extender...

Sounds like a fried CIA chip. These are quite easy to get (try eBAY).

Tomer

On Thu, 09 Dec 1999 14:13:26 +0000, Tim Jackson <jacksontd@cf.ac.uk>
wrote:

>The other day a house about 50m away had a direct lightning strike to it. 
>This caused an induced surge on the nearby telephone system and
>unfortunately this hit my modem line.
>
>As a result, the modem connected to the line got fried.  The PC connected
>to the modem died.  My Amiga, connected to the PC via a null modem cable
>seems to be OK *except* that the serial port appears to be dead - I've
>tried it with a modem borrowed from a friend (which works) and I can't
>persuade it to do anything at all so I'm fairly sure that it is dead.
>
>I've had a look inside and there's no obvious visible damage (unlike in
>the modem where capacitors literally exploded) so I'm guessing the serial
>chip has gone.  Presumably (since it's all SMD) there's not much I can
>do?  

even if they're surface  mount, they shoudl be easy to
desolder/replace.   look for the 1488/1489 chips.  one is the serial
port receiver, one is the transmitter.  they're directly in harm's way
between the CIA bits (for control signals) and the paula (for TX/RX
data).  hopefully, that's all that's blown.  the chips ares quite
cheap.

--
// scott drysdale // drysdale@netstorm.net
// amigas and panheads and guns, oh my!