I've got an Amiga 1200 that I recently got out of storage after a few months of hiatus, and unfortunately it's not working properly. Can anyone help me with this?
For starters here are the specs:
Amiga 1200 Rev. 1D4
Kickstart 3.0, Workbench 3.1 (HstWB + Amiga Game Selector)
Arananet based 8MB FastRAM expansion
80GB 2.5" IDE HDD
PCMCIA 10mbps NIC
This 1200 has two distinctive issues that manifested themselves at the exact same time.
One is that I'm getting some kind of interference on the picture as seen in the picture below. It's constantly rolling up.
The other issue is that I'm getting GURU Meditation errors. 8000 0004 right upon booting Workbench. 8100 0005 or 8000 0003 when trying to start WHDLoad games through AGS.
Steps that I've tried to troubleshoot:
For the picture quality issue...
For the guru errors...
Ok, so far it seems the guru errors are related to the expansion, so I decided to get Amiga Test Kit from the website and test the FastRAM and I got errors, as I expected.
Oddly enough, seems that the whole 16bit bus is "erroring" out and only on the upper Zorro II address space, but this was expected, as setting to 4MB tested fine. I decided to test in 512KB chunks from 0x60000 up to 0x9fffff, the results were unexpected. Every single test yielded the same exact errors, seems unlikely that both RAM ICs are dead, and if they were I'd get a bit here and there that would fail, not the whole bus. Could it be a failing CPLD? I tried direct memory detection on ATK and it detected the whole 8MB of RAM.
Also, I have ordered tools and the components needed for recapping this 1200, I did give good look through the whole motherboard and there isn't any visible traces of electrolyte. It is in very good shape, just a bit dusty.
I wouldn't be surprised if the video issues are caused by dying capacitors, but the RAM issues... Could it also be the case?
I'm running out of ideas here. I'd be most grateful for some help on these matters.
Cheers.
For starters here are the specs:
Amiga 1200 Rev. 1D4
Kickstart 3.0, Workbench 3.1 (HstWB + Amiga Game Selector)
Arananet based 8MB FastRAM expansion
80GB 2.5" IDE HDD
PCMCIA 10mbps NIC
This 1200 has two distinctive issues that manifested themselves at the exact same time.
One is that I'm getting some kind of interference on the picture as seen in the picture below. It's constantly rolling up.
The other issue is that I'm getting GURU Meditation errors. 8000 0004 right upon booting Workbench. 8100 0005 or 8000 0003 when trying to start WHDLoad games through AGS.
Steps that I've tried to troubleshoot:
For the picture quality issue...
- I've tried using different cables to plug to the TV/monitor, such as: RGB to SCART, RGB to VGA (monitor accepts 15KHz) and composite. All show the same exact pattern of interference. I am not using any upscaler.
- Tried booting the computer with absolutely nothing connected to it but the power and video cable.
For the guru errors...
- Removing PCMCIA card (No change). After this all tests were done without the NIC card.
- Cleaning the expansion edge connector with IPA (No change)
- Plugging and unplugging the expansion a few times to clean the contacts in the slot (No change)
- Removing the 8MB expansion card (It booted fine)
- Swapped the jumper on the expansion card to only use 4MB of RAM (Also worked fine, also ran a few games and workbench for 15~20 min with no issues)
- Plugged the PCMCIA NIC while expansion is set to 4MB (Worked flawlessly, managed to go online and transfer files from my Windows PC via FTP)
Ok, so far it seems the guru errors are related to the expansion, so I decided to get Amiga Test Kit from the website and test the FastRAM and I got errors, as I expected.
Oddly enough, seems that the whole 16bit bus is "erroring" out and only on the upper Zorro II address space, but this was expected, as setting to 4MB tested fine. I decided to test in 512KB chunks from 0x60000 up to 0x9fffff, the results were unexpected. Every single test yielded the same exact errors, seems unlikely that both RAM ICs are dead, and if they were I'd get a bit here and there that would fail, not the whole bus. Could it be a failing CPLD? I tried direct memory detection on ATK and it detected the whole 8MB of RAM.
Also, I have ordered tools and the components needed for recapping this 1200, I did give good look through the whole motherboard and there isn't any visible traces of electrolyte. It is in very good shape, just a bit dusty.
I wouldn't be surprised if the video issues are caused by dying capacitors, but the RAM issues... Could it also be the case?
I'm running out of ideas here. I'd be most grateful for some help on these matters.
Cheers.
