H8 System Support II
This board provides eight utility functions to augment the H8 computer:
1) "Blinkenlights" activity LED controller, monitoring eight user-selectable (by GAL programming) I/O activities.
2) Speech output, with optional National Semiconductor "Digitalker" chipset and/or Parallax EMIC2 Text-to-Speech board
3) I2C controller, using the PCA9665 chip
4) PWM controller, using the PCA9685 chip (eight channels wired)
5) Dual USB ports, using the Vinculum VDIP1, with COMMAND/DATA toggle for both USB file and "vanilla" serial communications
6) Single RS232 port, using a 16C550 chip
7) Eight channels of cascaded interrupts
8) Epson RTC-72421 real time clock, with interrupt capability
(Rev "L" shown with optional EMIC2 Text-to-Speech
board)