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Document PH00524 a bit more

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Rahix 2024-08-15 02:20:20 +02:00
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## Board `PH00524-2`
The board controlling the vacuum valves does not show up in the schematics
delivered with the SEM. To us, it seems like the functionality was updated by
merging a few of the boards from the schematics into a single board with even
more smartness.
`PH00524-2` contains connectors named `FK*`, `FM*`, and `FL*`, leading to the
assumption that the boards `FK`, `FM`, and `FL` have been integrated into it.
So far, the connectors seem to match up with the ones shown in the SEM schematics.
There is also a Z80 based system + an EEPROM on the board.
![Image of PH00524-2](./ph00524-2.jpg)

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