3UBI EasyCoder 101 – Technical ManualCONTENTS, cont'd.Electronics Accessing the CPU Board ..................................................... 60CPU Board............................................................................ 61UBI Fingerprint EPROM's .................................................... 62Configuration EPROM's ........................................................ 62RAM Memory ...................................................................... 63GAL Circuit .......................................................................... 63Real-time Clock Circuit ......................................................... 63Potentiometers....................................................................... 64Interfaces Communication Port "uart1:"................................................. 65Serial Interface Board: RS 232C (V24) on "uart1:" ................ 66Serial Interface Board: 20 mA CL on "uart1:" ........................ 68Optional Interface Boards ...................................................... 71Parallel Interface Board ......................................................... 72Parallel Interface Board: "centronics:" ................................... 73Parallel Interface Board: RS 232C (V24) on "uart1:" ............. 75Triple Serial Interface Board .................................................. 77Triple Serial Interface Board: RS 232C (V24) on "uart1:" ...... 78Triple Serial Interface Board: 20 mA CL on "uart1:".............. 80Triple Serial Interface Board: RS 232C (V24) on "uart2:" ...... 82Triple Serial Interface Board: RS 232C (V24) on "uart3:" ...... 84