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4MB RAM expansion for Atari 520ST(M)
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Rev C now. 'Fixed' by DoG Dec 2021.

Main fixes are:
* Made the trace for CAS0H so bodge wire is not needed anymore.
* I changed the silkscreen text for CAS1H with CAS1L. 
  CAS0H and CAS0L are fetched from wrong chip onboard. They are swapped and thus misslabeled.
  That makes CAS1H and CAS1L also misslabeled.
* Removed VCC layer on top and made it GND instead (VCC trace was already present anyway).
* Only D0-D15 and GND is needed from board so only white squares needs soldered.
  Soldered the full DIP16 pins though. (BTW; D0-7 is swapped with D8-D15 on board)
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PCB is made so that High and Low side is swapped. But it works anyway.

I couldn't bother to change all that...


//DoG