With this soldered into a sega master system or sega master system 2 you can pause and reset the console when used with my controller pcbs. This is to be soldered to the I/o chip. There are two versions and here is the pinout of both: 315 5237 up-pin10 down-pin11 left-pin12 right-pin13 button2(tr)-pin20 ground-pin45 5v-pin48 use pin 33 to reset on sms2.

315 5216 up-pin25 down-pin26 left-pin27 right-pin28 button 2(tr)-pin30 5v-pin32 ground-pin11 use 22 for reset on master system 2. solder pause and reset to the inputs of the pause and reset switch in master system 1 and the inputs of pause in master system 2. IMPORTANT: if soldering into an sms2 you need to pull the reset pin out of circuit for reset to work either by cutting or desoldering and lifting out