Oric Repair: The "Impossible" RAM Failure

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This episode is sponsored by PCBWay
What should have been a relatively straightforward repair of an Oric Atmos, turned into a wild chase for the true source of the problem. Tests kept pointing me in one direction, but my gut told me it was something else.

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Chapters:
00:00 Intro
01:22 Look inside
03:43 Voltages
05:21 Clocks
08:16 RAM
09:17 Diagnostics ROM
12:50 RAM circuit
15:02 ULA
16:08 Power
18:51 Last try
20:38 Testing
21:13 Making sense of things
23:46 Conclusion

Links:
Oric diagnostics ROM
Blake's 7

Music tracks:
Funky Stars by McKlain
Battro OST by McKlain
More awesome music by McKlain:

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