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A comment on Woz’s take on the Apple 1’s noisy -5 volt supply. Parent comment

Re:Woz’s take on the Apple 1’s noisy -5 volt supply by cnvogel on Tuesday November 04, 2014 @12:30PM (#8557774)
It's the DRAM.

Mostek MK4027 (1 Chip, 4096x1 bits each), needs +5V, -5V and +12V.

https://www.google.de/search?q=Mostek+MK4027

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