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| faulty Quadra 650 Mainboard ... |
I buy a faulty Q650 Mainboard and Test it ...
The error occurs in almost 90% of all programs started, including a Mac OS installer. There must be a hardware defect on the motherboard. The board is clean and looks flawless.
Posted by: franklyn on 2025-11-29 08:37:02 |
Looks to me like you've got a LC CPU on a Quadra 650 (not Centris) board. Quadra 650 configuration assumes a FPU will always be present and thus any SANE traps will catastrophically fail because they use the FPU which causes just about everything to throw a trap like that. Ran into that with the 68060 project.
If you set the resistors to the Centris 650 configuration it should resolve that. Or just install a full 040.
Posted by: zigzagjoe on 2025-11-29 10:04:58 |
Yes I install a LC CPU from my Performa 475 I have left over.
I install a full 040 and see ...
Posted by: franklyn on 2025-11-29 10:36:53 |
It works better but Mac OS 7.6 and 8.0 Installer terminates with an error, and upon rebooting, a "sad mac" message appears. The computer only boots up fine with a CD image.
TattleTech start up with the "error 3" ...
... System Bootup
0000000F
00000028
Posted by: franklyn on 2025-11-29 11:47:26 |
I initially thought it was due to the RAM, which consisted of two EDO SIMM modules. However, the memory test showed no problems. I also tried two 8MB FPM SIMM modules, but without any improvement.
The system installers, whether for 7.5.3 or 7.6, all hang after two-thirds of the installation without any error message ...
I run the Norton Disk Doctor to check the BlueSCSI HDD with no errors.
Posted by: franklyn on 2025-11-30 02:58:13 |
Suddenly the Mainboard works, which is annoying when it doesn't work and then suddenly does, and you can't find any error to fix. I installed System 7.1 and System 7.6 for testing purposes without any problems. I'm using two 32MB SIMM modules and two 16MB SIMM modules, all EDO, without any issues. I heard that EDO can also do FPM mode? I'm also using two 256KB VRAM SIMM modules from an LC with a 100ns printed speed, and they work without any problems.
Posted by: franklyn on 2025-12-01 09:20:55 |
I put the Mainboard in my Quadra 700 case ...
Posted by: franklyn on 2025-12-02 06:01:10 |