based on my own and others' research
SystemID NES
0018 b u 0 RAM Game Mode
001A b u 0 RAM Frame Counter
00AE b u 0 RAM Player Invincibility Timer
0098 b u 0 RAM Player Vel X
00C6 b s 0 RAM Player Vel Y
00B4 b u 0 RAM Player Dead Flag
00AA b u 0 RAM Player Current Weapon
0064 b u 0 RAM Screen Scroll X 1
0065 b u 0 RAM Screen Scroll X 2
00D6 b h 0 RAM Player Animation Frame
00C2 b u 0 RAM Player Aim Direction
0334 b u 0 RAM Player Pos X
031A b u 0 RAM Player Pos Y
0368 b u 0 RAM Bullet 1 State
0369 b u 0 RAM Bullet 2 State
036A b h 0 RAM Bullet 3 State
036B b h 0 RAM Bullet 4 State
036C b h 0 RAM Bullet 5 State
036D b h 0 RAM Bullet 6 State
036E b h 0 RAM Bullet 7 State
036F b h 0 RAM Bullet 8 State
0370 b h 0 RAM Bullet 9 State
0371 b h 0 RAM Bullet 10 State
03C8 b h 0 RAM Bullet 1 Pos X
03C9 b h 0 RAM Bullet 2 Pos X
03CA b h 0 RAM Bullet 3 Pos X
03CB b h 0 RAM Bullet 4 Pos X
03CC b h 0 RAM Bullet 5 Pos X
03CD b h 0 RAM Bullet 6 Pos X
03CE b h 0 RAM Bullet 7 Pos X
03CF b h 0 RAM Bullet 8 Pos X
03D0 b h 0 RAM Bullet 9 Pos X
03D1 b h 0 RAM Bullet 10 Pos X
03B8 b h 0 RAM Bullet 1 Pos Y
03B9 b h 0 RAM Bullet 2 Pos Y
03BA b h 0 RAM Bullet 3 Pos Y
03BB b h 0 RAM Bullet 4 Pos Y
03BC b h 0 RAM Bullet 5 Pos Y
03BD b h 0 RAM Bullet 6 Pos Y
03BE b h 0 RAM Bullet 7 Pos Y
03BF b h 0 RAM Bullet 8 Pos Y
03C0 b h 0 RAM Bullet 9 Pos Y
03C1 b h 0 RAM Bullet 10 Pos Y
04BE b h 0 RAM Enemy 1 Type
04BF b h 0 RAM Enemy 2 Type
04C0 b h 0 RAM Enemy 3 Type
04C1 b h 0 RAM Enemy 4 Type
04C2 b h 0 RAM Enemy 5 Type
04C3 b h 0 RAM Enemy 6 Type
04C4 b h 0 RAM Enemy 7 Type
04C5 b h 0 RAM Enemy 8 Type
04C6 b h 0 RAM Enemy 9 Type
04C7 b h 0 RAM Enemy 10 Type
0344 b h 0 RAM Enemy 1 Pos X
0345 b h 0 RAM Enemy 2 Pos X
0346 b h 0 RAM Enemy 3 Pos X
0347 b h 0 RAM Enemy 4 Pos X
0348 b h 0 RAM Enemy 5 Pos X
0349 b h 0 RAM Enemy 6 Pos X
034A b h 0 RAM Enemy 7 Pos X
034B b h 0 RAM Enemy 8 Pos X
034C b h 0 RAM Enemy 9 Pos X
034D b h 0 RAM Enemy 10 Pos X
032A b h 0 RAM Enemy 1 Pos Y
032B b h 0 RAM Enemy 2 Pos Y
032C b h 0 RAM Enemy 3 Pos Y
032D b h 0 RAM Enemy 4 Pos Y
032E b h 0 RAM Enemy 5 Pos Y
032F b h 0 RAM Enemy 6 Pos Y
0330 b h 0 RAM Enemy 7 Pos Y
0331 b h 0 RAM Enemy 8 Pos Y
0332 b h 0 RAM Enemy 9 Pos Y
0333 b h 0 RAM Enemy 10 Pos Y
057E b h 0 RAM Enemy 1 HP
057F b h 0 RAM Enemy 2 HP
0580 b h 0 RAM Enemy 3 HP
0581 b h 0 RAM Enemy 4 HP
0582 b h 0 RAM Enemy 5 HP
0583 b h 0 RAM Enemy 6 HP
0584 b h 0 RAM Enemy 7 HP
0585 b h 0 RAM Enemy 8 HP
0586 b h 0 RAM Enemy 9 HP
0587 b h 0 RAM Enemy 10 HP
07E2 b u 0 RAM Score 1
07E3 b u 0 RAM Score 2
001B b u 0 RAM isLagFrame