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Typo
Updated PIO port (markdown)
changed "boot PROM" to "boot mask ROM"
Adding devices info
Formatting
Adding broken PIO port picture
Adding link to replacement plugs
Plug clarification
I²S still
I²S again
I²S
high impedance
Chip Select wikipedia link
!CS0 clarification
Typos
Hardware registers
More data
Some more information.
Initial pinout