My own research
SystemID NES
0060 b h 0 RAM RNG State?
0051 b u 0 RAM Drawn Room
04AC b u 0 RAM Screen Transition
04C9 w u 0 RAM Buffered Command
0791 b u 0 RAM Global Timer
0617 b h 0 RAM Kid Frame
002C b u 0 RAM Frame Phase
0611 b u 0 RAM Kid Pos Y
060F w u 0 RAM Kid Pos X
04DE b u 0 RAM Kid Room
04EB b u 0 RAM Boot Flag 1
0584 b u 0 RAM Kid Has Sword
0601 b u 0 RAM Guard Notice
0616 b u 0 RAM Kid Jumping State
0625 b u 0 RAM Guard Animation
06C8 b u 0 RAM Boot Flag 2
06DB b u 0 RAM Guard Is Alive
0732 b u 0 RAM Screen Drawn
001C b u 0 RAM Game State
06EE b u 0 RAM Kid Fight Mode (0 - No Sword, 1 - Sword, 2 - Fighting)
06D1 b u 0 RAM Is Paused
0070 b u 0 RAM Current Level
06CF b u 0 RAM Kid HP
06D0 b u 0 RAM Guard HP
06E4 b u 0 RAM Fall Wait
06E5 b u 0 RAM Bottom Text Timer
0400 b u 0 RAM Exit Door State
06F7 b u 0 RAM Level 4 Exit Door State
0708 b u 0 RAM Level 2 Exit Door Status
073A b u 0 RAM Level 1 Room 19 Door
0621 b u 0 RAM Guard Frame
061D b u 0 RAM Guard Pos X
0613 b u 0 RAM Kid Movement Control
04CD b u 0 RAM Door Opening Timer
06A2 b u 0 RAM Level 2 Last Tile FG
06A4 b u 0 RAM Level 1 First Tile BG
06B0 b u 0 RAM Level 1 First Tile FG
01F7 d u 0 RAM Screen Transition Timer
06C2 b u 0 RAM Password Timer
0502 b u 0 RAM Skeleton Loose Tile
0000 b u 0 RAM Game Mode
04EF b u 0 RAM IGT Timer