SEGA PART #171-5519

32k & 1 Megabit PCBs

These are undated PCB's for the Sega Master System.  Games from 32k to 1 Megabit use these PCB's.  Most of these are early titles.  Each ROM has 28 PINs.  The serial number can be located on the back of the PCB on the left-hand side.

Games like Choplifter have also been found using the 171-5364 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.

Transbot is unique because it was originally released on the Sega Card here in America.  The card has a maximum capacity of 32KBytes.  This version of Transbot I obtained is for the UK market.  It is a PAL release on cartridge.  It is still 32KBytes.  The Master System itself can only access 64KBytes of ROM.  Every game over 32KBytes has a special memory controller built into it to get past this limitation.  Since this ROM is exactly 32Kbytes, it does not have a memory controller built into it.  Transbot was probably re-released in this form when the Master System was redesigned into the Master System 2 which eliminated the card slot, which is why the MPR is much later in the sequence.