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These traces go SP1 connects to four channels of U14 (SPI mem?), an 8-channel analog MUX. Pin 2 also connects to R111, non-populated, which would provide a pull-up to +5 at Pin 1.
SP1 connection endpoints
|2
|Unknown
|U14 Pin 13 (A0) - 3V rounded square pulses, 2x per second, 2 different periods avg ~75msec?
|-
|3
|4
|Unknown
|U14 Pin 14 (A1) - 5V, 0.1msec pulse once per second
|-
|5
|6
|Unknown
|U14 Pin 15 (A2) - 5V, 0.1msec pulse once per second
|-
|7
|8
|Unknown
|U14 Pin 12 (A3) - 3V, 250msec pulse once per second
|}
==Components==
