Sega Master System / Mark III / Game Gear
Now that we've built up the power supply, the next step is to solder in the IC sockets and cartridge connector, and the wire links to provide power to them.
Orient one of the 16 pin sockets so that pin 1 is at 12P and pin 16 is at 9P (i.e. the notch faces left). Place the other 16 pin socket so that pin 1 is at 12AB and pin 16 is at 9AB.
The 14 pin socket should be placed such that pin 1 is at 34K and pin 14 is at 37K, i.e. with the notch facing right.
This should be placed so that pin 1 goes to 25H and pin 2 goes to 27H. (Pins 49 and 50 will be at 25AF and 27AF respectively.)
Cut tracks at the following holes:
Solder the three 100nF ceramic decoupling capacitors in the following positions:
Solder wire links between the following pairs of holes. Use solid core, insulated wire for this. For links between holes which are very close together, you can remove the insulation entirely, so long as there's no likelihood of the wire touching another bare wire or a component leg.
Here's what your SMSReader should look like now: