-* board - breakout-specific pin identities
-* microcontroller - chip-specific pin identities
-* digitalio - digital input/output pins, using pin identities from board/microcontroller
+* **board** - breakout-specific pin identities
+* **microcontroller** - chip-specific pin identities
+* **analogio** - analog input/output pins, using pin identities from board+microcontroller packages
+* **digitalio** - digital input/output pins, using pin identities from board+microcontroller packages
+* **bitbangio** - software-driven interfaces for I2C, SPI
+* **busio** - hardware-driven interfaces for I2C, SPI, UART
+* **time** * - substitute functions monkey-patched to time module