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SE/30 is ASC a must for booting?

Posted by: codevonlux on 2024-03-23 23:19:04 I am working on a new SE/30. The leakage from bad caps must have shorted pin 5/6 of UE10 (ASC sound chip) at some point that caused a serious melt down to UE10. I can even see some mark from black smoke on the bottom of the metal frame that is over the top of UE10. I removed UE10 and replaced UE8/LS166, replaced all other caps. While waiting for a new sound chip. I want to continue booting the machine. I don’t expect to hear any chime and but is using an oscilloscope to monitor ROM simm A2 pin for activity. I can see ROM was running for like 5 seconds then went to some kind of loop. The pattern of activity matches a long chimes of death. Is UE10/ASC a must in SE/30 to boot? -Yi

Posted by: Arbee on 2024-03-24 11:39:32 The boot chime code in the ROM polls the ASC state, so you likely won't get visible progress without it.

Posted by: croissantking on 2024-12-03 20:43:31 I booted an SE/30 board without an ASC the other day and it worked fine, sans audio.

Posted by: djc6 on 2024-12-04 16:11:42 Maybe try and send "TechStep" diagnostic commands over the serial port - to see if the CPU is executing code? Recent video on the topic: I was able to confirm signs of life on my SE/30 (no video - black screen only) via the serial port.

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