io_0 - display
io_1 - y endstop
io_2 - x endstop
io_7 - bltouch

z left - driver0 (seeing from the back)
z rear - driver1 
z right - driver2
right motor - driver3 - Y
left motor - driver4 - X   
extruder motor - driver5 

out1 - SSR
out2 - filament heater 

temp0 - bed
temp1 - filament heater thermistor

out7 - hotend fan
out4 - layer fan