| 0080 | m80 | |
| 0081 | m81 | |
| 0082 | skipPlayfield | If D7 is set then skip drawing the playfield |
| 0083 | m83 | |
| 0084 | m84 | |
| 0085 | m85 | |
| 0086 | frameCounter | Incremented every TV frame |
| 0087 | maskRightNumber | Mask to turn off right number (0 for off, FF for on) |
| 0088 | m88 | ?? F00F something to do with console switch inputs |
| 0089 | m89 | |
| 008A | m8A | |
| 008B | m8B | |
| 008C | m8C | |
| 008D | m8D | |
| 008E | m8E | |
| 008F | m8F | |
| 0090 | m90 | |
| 0091 | m91 | |
| 0092 | m92 | |
| 0093 | m93 | |
| 0094 | m94 | |
| 0095 | m95 | |
| 0096 | m96 | |
| 0097 | m97 | |
| 0098 | m98 | |
| 0099 | m99 | |
| 009A | m9A | |
| 009B | m9B | |
| 009C | m9C | |
| 009D | m9D | |
| 009E | m9E | |
| 009F | m9F | |
| 00A0 | mA0 | |
| 00A1 | scoreP1 | Score for player 0 |
| 00A2 | scoreP1 | Score for player 1 |
| 00A3 | mA3 | |
| 00A4 | player0row | Row number of player 0 |
| 00A5 | player1row | Row number of player 1 |
| 00A6 | missile0row | Row number of missile 0 |
| 00A7 | missile1row | Row number of missile 1 |
| 00A8 | mA8 | |
| 00A9 | mA9 | |
| 00AA | mAA | |
| 00AB | mAB | |
| 00AC | mAC | |
| 00AD | mAD | |
| 00AE | mAE | |
| 00AF | mAF | |
| 00B0 | mB0 | |
| 00B1 | mB1 | |
| 00B2 | mB2 | |
| 00B3 | mB3 | |
| 00B4 | scanlineNumber | Counts the scan lines while drawing |
| 00B5:B6 | pf0Graphics | Pointer to PF0 graphics |
| 00B7:B8 | pf1Graphics | Pointer to PF1 graphics |
| 00B9:BA | pf2Graphics | Pointer to PF2 graphics |
| 00BB | mBB | |
| 00BC | mBC | |
| 00BD | playerXpicture | Offset to player graphics (interleaved -- P0 even, P1 odd) |
| 00BE | mBE | |
| 00BF | mBF | |
| 00C0 | mC0 | |
| 00C1 | mC1 | |
| 00C2 | mC2 | |
| 00C3 | mC3 | |
| 00C4 | mC4 | |
| 00C5 | mC5 | |
| 00C6 | mC6 | |
| 00C7 | mC7 | |
| 00C8 | mC8 | |
| 00C9 | mC9 | |
| 00CA | mCA | |
| 00CB | mCB | |
| 00CC | mCC | |
| 00CD | mCD | |
| 00CE | mCE | |
| 00CF | mCF | |
| 00D0 | mD0 | |
| 00D1 | mD1 | |
| 00D2 | scratch1 | Temporary variable used several places |
| 00D3 | stackPointer | Holds stack pointer while drawing the screen (with the stack pointer) |
| 00D4 | mD4 | |
| 00D5 | mD5 | |
| 00D6 | colorP0 | Color of Player 0 |
| 00D7 | colorP1 | Color of Player 1 |
| 00D8 | mD8 | |
| 00D9 | mD9 | |
| 00DA | mDA | |
| 00DB | mDB | |
| 00DC | mDC | |
| 00DD | mDD | |
| 00DE | nextLeft | Holds next pattern for left two digits (offset into 5 slots) |
| 00DF | nextRight | Holds next pattern for right two digits (offset into 5 slots) |
| 00E0 | leftDigitLSD | Least significant digit for left number (offset into 5 slots) |
| 00E1 | rightDigitLSD | Least significant digit for right number (offset into 5 slots) |
| 00E2 | leftDigitMSD | Most significant digit for left number (offset into 5 slots) |
| 00E3 | rightDigitMSD | Most significant digit for right number (offset into 5 slots) |
| 00E4 | mE4 | |
| 00E5 | mE5 | Seems to be first non-used (like reserved for stack) |
| 00E6 | mE6 | |
| 00E7 | mE7 | |
| 00E8 | mE8 | |
| 00E9 | mE9 | |
| 00EA | mEA | |
| 00EB | mEB | |
| 00EC | mEC | |
| 00ED | mED | |
| 00EE | mEE | |
| 00EF | mEF | |
| 00F0 | mF0 | |
| 00F1 | mF1 | |
| 00F2 | mF2 | |
| 00F3 | mF3 | |
| 00F4 | mF4 | |
| 00F5 | mF5 | |
| 00F6 | mF6 | |
| 00F7 | mF7 | |
| 00F8 | mF8 | |
| 00F9 | mF9 | |
| 00FA | mFA | |
| 00FB | mFB | |
| 00FC | mFC | |
| 00FD | mFD | |
| 00FE | mFE | |
| 00FF | mFF | Stack builds towards 00 from here |
