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AuthorTopic: amiga 1200 green screen on power on  (Read 138 times)

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Offline soviet

amiga 1200 green screen on power on
« on: September 14, 2020, 08:48:16 PM »
Hi guys, a friend of mine asked me if i can fix an amiga 1200 that he got recently.
The motherboard is a 1200 rev 2b motherboard.

Testing the bare motherboard only, no accelerator or anything just monitor and power (the psu is an atx psu and is working on my 1200).
I always got a green screen.

Any tips on fixing this are welcome !.


Using the diagroms i got this:


small video showing the colors and serial output from diagrom (no addons only base motherboard):
https://www.youtube.com/watch?v=Km6aRZVArGA&feature=youtu.be



then.
inserting a fast ram expansion got me other random results tried just turning on pressing left mouse button and right mouse button:
after this the test get stuck.



This means that i have to replace the chipram on the board ?, or could be other issues?
« Last Edit: September 14, 2020, 08:48:48 PM by soviet »
 

Offline Chucky

Re: amiga 1200 green screen on power on
« Reply #1 on: September 14, 2020, 10:19:02 PM »
memoryissues does NOT need to be a Memorychip being bad.  it can be so much more.

1.2.1 sadly does not handle addresserrors..   1.3 beta does.



btw kudos using a real terminal.  RESPECT! :)
 

Offline soviet

Re: amiga 1200 green screen on power on
« Reply #2 on: September 15, 2020, 01:13:51 AM »
memoryissues does NOT need to be a Memorychip being bad.  it can be so much more.

1.2.1 sadly does not handle addresserrors..   1.3 beta does.



btw kudos using a real terminal.  RESPECT! :)

Thanks !, love old terminals.
Also is possible to get the 1.3 beta test rom dumps ?.
:D
 

Offline Chucky

Re: amiga 1200 green screen on power on
« Reply #3 on: September 15, 2020, 06:19:17 AM »
www.diagrom.com    just download the "daily" version