Ch341par.exe

C:\Program Files (x86)\CH341\CH341PAR\ch341par.exe

ch341par.exe -s 0x0C ; 0x0C = 00001100 → INIT=1, others high Then pulse strobe low and back: ch341par.exe

ch341par.exe -s 0x0D ; low ch341par.exe -s 0x0C ; high -r returns status byte. Busy is bit 7 (value 0x80). Invert logic (busy low = printer busy). C:\Program Files (x86)\CH341\CH341PAR\ch341par

Data: 0x00 Status: 0x79 Control: 0x0F Interpretation depends on your wiring. ch341par.exe -w 255 Now pins 2-9 go high (+5V / 3.3V depending on adapter). Example 3: Set data pins to binary pattern To set D7..D0 = 10101010 (0xAA): 0x0C = 00001100 → INIT=1