Cat can even find a single warm capacitor to sit on.
Trying to fix Mikro's wrecked TT board
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dml
- Posts: 842
- Joined: 15 Nov 2017 22:11
Re: Trying to fix Mikro's wrecked TT board
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d:m:l
BadMooD d/l: https://www.leonik.net/dml/sec_bm.py
SVO30 d/l: https://www.leonik.net/dml/sec_svo30.py
Q2 engine d/l: https://www.leonik.net/dml/sec_q2.py
AGT project: https://www.leonik.net/dml/sec_agt.py
Atari page: http://www.leonik.net/dml/sec_atari.py
YT: https://www.youtube.com/@dmlTPT
BadMooD d/l: https://www.leonik.net/dml/sec_bm.py
SVO30 d/l: https://www.leonik.net/dml/sec_svo30.py
Q2 engine d/l: https://www.leonik.net/dml/sec_q2.py
AGT project: https://www.leonik.net/dml/sec_agt.py
Atari page: http://www.leonik.net/dml/sec_atari.py
YT: https://www.youtube.com/@dmlTPT
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exxos
- Site Admin
- Posts: 28352
- Joined: 16 Aug 2017 23:19
- Location: UK
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dml
- Posts: 842
- Joined: 15 Nov 2017 22:11
Re: Trying to fix Mikro's wrecked TT board
:D
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d:m:l
BadMooD d/l: https://www.leonik.net/dml/sec_bm.py
SVO30 d/l: https://www.leonik.net/dml/sec_svo30.py
Q2 engine d/l: https://www.leonik.net/dml/sec_q2.py
AGT project: https://www.leonik.net/dml/sec_agt.py
Atari page: http://www.leonik.net/dml/sec_atari.py
YT: https://www.youtube.com/@dmlTPT
BadMooD d/l: https://www.leonik.net/dml/sec_bm.py
SVO30 d/l: https://www.leonik.net/dml/sec_svo30.py
Q2 engine d/l: https://www.leonik.net/dml/sec_q2.py
AGT project: https://www.leonik.net/dml/sec_agt.py
Atari page: http://www.leonik.net/dml/sec_atari.py
YT: https://www.youtube.com/@dmlTPT
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exxos
- Site Admin
- Posts: 28352
- Joined: 16 Aug 2017 23:19
- Location: UK
Re: Trying to fix Mikro's wrecked TT board
:bravo: :2k2: :girldance:
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mikro
- Posts: 820
- Joined: 28 Aug 2017 23:22
- Location: Kosice, Slovakia
Re: Trying to fix Mikro's wrecked TT board
Details, details, details!!!
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dml
- Posts: 842
- Joined: 15 Nov 2017 22:11
Re: Trying to fix Mikro's wrecked TT board
:D
You do not have the required permissions to view the files attached to this post.
d:m:l
BadMooD d/l: https://www.leonik.net/dml/sec_bm.py
SVO30 d/l: https://www.leonik.net/dml/sec_svo30.py
Q2 engine d/l: https://www.leonik.net/dml/sec_q2.py
AGT project: https://www.leonik.net/dml/sec_agt.py
Atari page: http://www.leonik.net/dml/sec_atari.py
YT: https://www.youtube.com/@dmlTPT
BadMooD d/l: https://www.leonik.net/dml/sec_bm.py
SVO30 d/l: https://www.leonik.net/dml/sec_svo30.py
Q2 engine d/l: https://www.leonik.net/dml/sec_q2.py
AGT project: https://www.leonik.net/dml/sec_agt.py
Atari page: http://www.leonik.net/dml/sec_atari.py
YT: https://www.youtube.com/@dmlTPT
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dml
- Posts: 842
- Joined: 15 Nov 2017 22:11
Re: Trying to fix Mikro's wrecked TT board
\o/
You do not have the required permissions to view the files attached to this post.
d:m:l
BadMooD d/l: https://www.leonik.net/dml/sec_bm.py
SVO30 d/l: https://www.leonik.net/dml/sec_svo30.py
Q2 engine d/l: https://www.leonik.net/dml/sec_q2.py
AGT project: https://www.leonik.net/dml/sec_agt.py
Atari page: http://www.leonik.net/dml/sec_atari.py
YT: https://www.youtube.com/@dmlTPT
BadMooD d/l: https://www.leonik.net/dml/sec_bm.py
SVO30 d/l: https://www.leonik.net/dml/sec_svo30.py
Q2 engine d/l: https://www.leonik.net/dml/sec_q2.py
AGT project: https://www.leonik.net/dml/sec_agt.py
Atari page: http://www.leonik.net/dml/sec_atari.py
YT: https://www.youtube.com/@dmlTPT
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dml
- Posts: 842
- Joined: 15 Nov 2017 22:11
Re: Trying to fix Mikro's wrecked TT board
So there is something wrong with that buffer IC.
With inputs low, outputs were not correct for TTL - less than 3V.
When I removed the IC and socketed it, I randomly tried it again (since I have not found a replacement yet) and the machine woke up unexpectedly, started booting GEM.
I have left it for a while and its started being flaky again but when I heated the IC with the soldering iron it's again booting GEM and outputs are 4.8V.
The IC seems to be damaged in some way, I'll need to find a replacement to confirm properly.
There is still something funny with the power-on reset sequence vs reset button - but I'll come back to that later. I need to figure out how to rig up storage so I can make sure the machine is mostly working.
I should also spend some time with the diagnostic cart now that the remaining ICs are restored.
...and the daughter board has not been tested yet either.
With inputs low, outputs were not correct for TTL - less than 3V.
When I removed the IC and socketed it, I randomly tried it again (since I have not found a replacement yet) and the machine woke up unexpectedly, started booting GEM.
I have left it for a while and its started being flaky again but when I heated the IC with the soldering iron it's again booting GEM and outputs are 4.8V.
The IC seems to be damaged in some way, I'll need to find a replacement to confirm properly.
There is still something funny with the power-on reset sequence vs reset button - but I'll come back to that later. I need to figure out how to rig up storage so I can make sure the machine is mostly working.
I should also spend some time with the diagnostic cart now that the remaining ICs are restored.
...and the daughter board has not been tested yet either.
d:m:l
BadMooD d/l: https://www.leonik.net/dml/sec_bm.py
SVO30 d/l: https://www.leonik.net/dml/sec_svo30.py
Q2 engine d/l: https://www.leonik.net/dml/sec_q2.py
AGT project: https://www.leonik.net/dml/sec_agt.py
Atari page: http://www.leonik.net/dml/sec_atari.py
YT: https://www.youtube.com/@dmlTPT
BadMooD d/l: https://www.leonik.net/dml/sec_bm.py
SVO30 d/l: https://www.leonik.net/dml/sec_svo30.py
Q2 engine d/l: https://www.leonik.net/dml/sec_q2.py
AGT project: https://www.leonik.net/dml/sec_agt.py
Atari page: http://www.leonik.net/dml/sec_atari.py
YT: https://www.youtube.com/@dmlTPT
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Steve
- Posts: 3305
- Joined: 15 Sep 2017 11:49
Re: Trying to fix Mikro's wrecked TT board
@dml that's some awesome progress man! So good to see that little green desktop!
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PhilC
- Moderator
- Posts: 7442
- Joined: 23 Mar 2018 20:22
Re: Trying to fix Mikro's wrecked TT board
Gotta agree with Steve, well done @dmlSteve wrote: 27 Apr 2025 14:11 @dml that's some awesome progress man! So good to see that little green desktop!
If it ain't broke, test it to Destruction.
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