UBI EasyCoder 501 – Service Manual12417.6:5HPC Slave Processor17. CPU BOARD, cont'd./DSREOPUWRRDHPC+5V/TXDST1ST2ST3ST4ST5ST6INCGNDRDHPCEOP/DSRXINT/CTS/RXDAD0 – AD15, A1 – A10INTX0X1/RTSHPCBUSYA2STARTLATCHAD15AD14AD13AD12AD11AD10AD9AD8+5VUWRGND1213141516171819IC40474HC574MHPC46083-DEP/V30IC40260595857565554535251504948474645CKOI0I1ST1ST2RESETA0A1A2A3A4A5A6A7RDYCK2GND1011121314151617181920212223242526I7I6D0D1D2D3E1D4D5D6D7EXMP0P1P2P3NCB15B14B13B12B11B10B9B8A15A14A13A12A11A10A9A8VCC27282930313233343536373839404142/CTS/RXDD0D1D2D3XINTD4D5D6D7GNDSTRB1STRB2STRB3STRB4I5I4I3I2VCCEXUIB0B1B2B3B4B5B6B7WOGNDCKI9876432168676665646361NMIHPC/RESETAD0AD1AD2AD3AD4AD5AD6AD7GNDIC19CIC502A174HC04M74HC074MDDDDDDDD98765432A1A2A3A4A5A6A7A8OECLKSTRBCLKC403C402Y4001918171615141312IC40874HC573MDDDDDDDD23456789OECLKR410GNDST1–ENG1ST2–ENG1ST3–ENG1ST4–ENG1ST5–ENG1ST6–ENG1GND111GNDEN–ENG1111R400+5VR409EN–ENG1WRHPC1HPCBUSYIC503A74HC32M12 3IC19D74HC04M9 8IC08EP1174HC04M11 10IC509A74HC00M12 & 3 WAIT+5VR415X0X1+5VR416/RSETNMIHPCIC702C74HC08M910 & 8R423GNDR425BEEPBEEPEN IC204F7406M13 12BEEP2 1GND1R42224VGND+5VC410 –C413GND+40VC362 –C365ST1ST2ST3ST4ST5ST6STRB4STRB3STRB2423156+5V+5V/RTSLATCHHPCBUSYINT5 6STRB1/STXINCST1–ENG1ST2–ENG1ST3–ENG1ST4–ENG1ST5–ENG1ST6–ENG1FORWARDBACKWARDSTARTGND GNDR424R4211R426FCLK'S1DC1R123