Research from me and others
SystemID NES
0063 b u 0 RAM Game Timer
006D b u 0 RAM currentStage
006E b u 0 RAM currentSubStage
002D b u 0 RAM Game Mode
0066 b u 0 RAM bossHP
00BF b u 0 RAM Frame Counter
0076 b u 0 RAM ninjalives
0064 b u 0 RAM ninjaPoints
0065 b u 0 RAM ninjaHP
0084 b u 0 RAM ninjaStateFlags
0086 b u 0 RAM ninjaPosX
0085 b u 0 RAM ninjaPosX Frac
00AD b u 0 RAM ninjaSpeedX
00AC b u 0 RAM ninjaSpeedXFrac
008A b u 0 RAM ninjaPosY
0089 b u 0 RAM ninjaSpeedY
0087 b u 0 RAM ninjaSpeedYFrac
008C b u 0 RAM ninjaCollisionFlags
0094 b u 0 RAM ninjaFlinchDirection
0095 b u 0 RAM ninjaInvincibilityTimer
00C9 b u 0 RAM ninjaWeapon
0080 b u 0 RAM ninjaAnimationType
0081 b u 0 RAM ninjaAnimationOffset
0082 b u 0 RAM ninjaAnimationTimer
0083 b u 0 RAM ninjaAnimationFrame
0072 b u 0 RAM enemyCount
04C8 b u 0 RAM timeoutSeconds1
04C7 b u 0 RAM timeoutSeconds60
0050 b u 0 RAM screenScroll1
0051 b u 0 RAM screenScroll2
0052 b u 0 RAM screenScroll3
04BB b u 0 RAM Projectile 1 Pos X
045D b u 0 RAM