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| SE/30 does not boot from SCSI, but drives are accessible |
Posted by: craig1410 on 2022-02-21 14:25:44
@timtiger to test the 1Hz pulse, you just need to use the multimeter in DC (not AC) mode and in a voltage range greater than 5V. The multimeter will tend to react quite slowly so you might see it switch between around 4 volts and 1 volts. The important thing isn’t the voltage but the fact it changes roughly every 0.5 seconds between high and low.
Re your snooper test, I wonder if you’ve got some issues with the RAM multiplexers rather than the RAM itself.
Re the Rominator, beware that the PCB might be a bit thinner than the stock ROM and so it might need some extra support to get good connections with the socket. I’ve personally never had an issue with this but some people use 3D printed clips or rubber bands etc. Also be aware that you need to make some changes to system software in order to boot System 7.5 with the Rominator.
It seems to me that you may have more than one issue going on here which always makes it challenging to fix. |
Posted by: Bolle on 2022-03-01 09:29:01
And it was indeed the PRAM/RTC chip that was causing the issues.
@timtiger sent me the board, I desoldered the RTC to test it on one of my boards and the fault moved with it. |
Posted by: LaPorta on 2022-03-01 10:02:04
Finding RTCs is pretty hard, isn't it. |
Posted by: timtiger on 2022-03-10 00:14:20
This week the board arrived back home and works like a charm - thanks for your help guys and @Bolle! |
Posted by: schampango on 2023-01-01 12:08:45
I have exactly the same problem, was the solution to replace the RTC? |
Posted by: timtiger on 2023-01-01 12:24:31
I have exactly the same problem, was the solution to replace the RTC? Hi @schampango - yes, in my case the solution was to replace the rtc. Since that the se/30 still works without interruption. Though finding rtc chips isn’t easy; maybe you or someone else has a donator board… |
Posted by: schampango on 2023-01-01 13:35:57
Thank you @timtiger for your quick response. That will help me a lot! |
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