SEGA PART #171-5507

2 & 4 Megabit PCB - Date 1987

Simply seems to be a variation of the 171-5507D PCB.  I am unsure if this is a new or older version of the PCB, advantages or disadvantages.  Each ROM has 32 PINs, and the serial number is located on the back or the PCB on the left-hand side.  The only difference between the two is the 171-5507D is missing pins.  Pins 3, 4, 5, 11, 34, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 49 & 50 have been removed from the PCB

Games like Double Dragon have also been found using the 171-5507D PCB, yet the ROM MPR numbers remain the same.  There may not be any advantage/disadvantage when comparing one PCB to the next.  It simply may be a choice of what was available at the time.

Strider, Buggy Run & Sonic The Hedgehog Chaos are the only 4Meg games that is included on a single ROM and on this PCB as well.  All the other 4Meg titles I have use the 315-5235 external memory controller.

On the some of the Master System boxes, there is a four digit code that appears on the spine of the box.  The first digit indicates the size of the game (refer to the chart below).

4xxx = Sega card (32 kbytes)
5xxx = Mega cartridge (128 kbytes)
6xxx = combo cart
7xxx = Two-Mega cartridge (256 kbytes)
8xxx = 3-D carts (requires 3-D glasses unless otherwise noted)
9xxx = 4 Mega cart (i.e. 512 kbytes)
x5xx = battery back-up RAM