SE/30 is ASC a must for booting?

[codevonlux]

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

 

[Arbee]

The boot chime code in the ROM polls the ASC state, so you likely won't get visible progress without it.

 

[croissantking]

I booted an SE/30 board without an ASC the other day and it worked fine, sans audio.

 

[djc6]

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.