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Re: Trying to fix Mikro's wrecked TT board
Posted: 27 Apr 2025 14:43
by CiH
Woohoo! :D
So it just decided to work after all.
Re: Trying to fix Mikro's wrecked TT board
Posted: 27 Apr 2025 20:31
by Cyprian
dml wrote: 27 Apr 2025 12:39
Screenshot 2025-04-27 at 12.37.44.png
\o/
just wow, awesome
well done
@dml
Re: Trying to fix Mikro's wrecked TT board
Posted: 28 Apr 2025 08:57
by viking272
Terrific work!
Re: Trying to fix Mikro's wrecked TT board
Posted: 28 Apr 2025 09:50
by rubber_jonnie
Good work!!
:girldance:
Re: Trying to fix Mikro's wrecked TT board
Posted: 28 Apr 2025 10:48
by dml
Thanks everyone - a lot of luck involved with all the important bits already mostly OK, if a bit crunchy. Still happy to see it wake up though :)
I noticed Jookie mentioned something in the other TT thread about the reset circuit startup sequence with the POWER_GOOD supply signal - not starting from cold but waking on a reset. I'll need to read through it again more carefully for clues on that one.
Re: Trying to fix Mikro's wrecked TT board
Posted: 28 Apr 2025 11:49
by mikro
Great to see the board alive!
So what is the moral story of all this? Broken reset button and flaky buffer IC? (and maybe massaging the filed corner?)
Re: Trying to fix Mikro's wrecked TT board
Posted: 28 Apr 2025 12:13
by dml
mikro wrote: 28 Apr 2025 11:49
So what is the moral story of all this? Broken reset button and flaky buffer IC? (and maybe massaging the filed corner?)
So far that's about the size of it.
I replaced some sketchy IC sockets of course and added the missing ACIA - a few of the ICs are not original but temporary, still to put the originals back - and the temporary CPU of course instead of the daughter board.
I expect the actual problems preventing booting have been resolved though. I'll know for sure when I put all the original pieces back and then try to mount some storage and actually use it.
BTW I thought the TT would not boot without FPU? It seems to have reached the desktop before I installed one... or does it depend on TOS revision? Or something else?
Re: Trying to fix Mikro's wrecked TT board
Posted: 28 Apr 2025 12:40
by stephen_usher
Well done.
As for booting without an FPU, better check the OS sources.
Stuffing TOS 3.06 in would be useful as you'll see the memory check almost immediately and not just a white screen until it's finished.
Re: Trying to fix Mikro's wrecked TT board
Posted: 28 Apr 2025 13:02
by Badwolf
Back of the net!
:cheer:
BW
Re: Trying to fix Mikro's wrecked TT board
Posted: 28 Apr 2025 13:11
by mikro
dml wrote: 28 Apr 2025 12:13BTW I thought the TT would not boot without FPU? It seems to have reached the desktop before I installed one... or does it depend on TOS revision? Or something else?
That is a very good question. I see an fmove pretty early on even in TOS 3.00.