# Soccer (JU)

## Status

**Pass 3 complete; promoted.** `prg.s` is a traced disassembly with all
address-derived labels replaced, all `jsr`/`jmp` operands symbolic, hardware
registers named via `symbols.inc`, and `apply_symbols.py` reporting 0 residue.
Code coverage: 18,110 / 32,768 bytes (55.3%).
`make` assembles and verifies byte-identical to `rom.nes`.

## ROM

| Property | Value |
|----------|-------|
| Format | iNES |
| Mapper | 0 (NROM) |
| PRG | 32 KB |
| CHR | 8 KB |
| Mirroring | Vertical |
| NMI vector | $809F |
| RESET vector | $8000 |
| IRQ vector | $8000 |

## Power-on flow

RESET enters at `$8000`:

    cld                            ; CPU:$8000 PRG:0000  D8
    sei                            ; CPU:$8001 PRG:0001  78
    ldx #$00                       ; CPU:$8002 PRG:0002  A2 00
    stx PPUCTRL                    ; CPU:$8004 PRG:0004  8E 00 20
    stx PPUMASK                    ; CPU:$8007 PRG:0007  8E 01 20
    lda PPUSTATUS                  ; CPU:$800A PRG:000A  AD 02 20
    bpl Reset_OnNonnegative        ; CPU:$800D PRG:000D  10 FB
    dex                            ; CPU:$800F PRG:000F  CA
    txs                            ; CPU:$8010 PRG:0010  9A
    ldx #$1F                       ; CPU:$8011 PRG:0011  A2 1F
    lda Zp50,x                     ; CPU:$8013 PRG:0013  B5 50
    sta $0350,x                    ; CPU:$8015 PRG:0015  9D 50 03

NMI handler at `$809F`:

    php                            ; CPU:$809F PRG:009F  08
    pha                            ; CPU:$80A0 PRG:00A0  48
    txa                            ; CPU:$80A1 PRG:00A1  8A
    pha                            ; CPU:$80A2 PRG:00A2  48
    tya                            ; CPU:$80A3 PRG:00A3  98
    pha                            ; CPU:$80A4 PRG:00A4  48
    ldx #$03                       ; CPU:$80A5 PRG:00A5  A2 03
    lda $80EE,x                    ; CPU:$80A7 PRG:00A7  BD EE 80

## Data-table inventory (Pass 3)

- `$8251-$8262` (18 bytes) - `LevelHandlerPointerTable`
- `$82EF-$8306` (24 bytes) - `PlayerSpeedTable`
- `$832C-$832F` (4 bytes) - `LevelStartParameterTable`
- `$8921-$8996` (118 bytes) - `PlayerMovementTable`
- `$89D2-$89DB` (10 bytes) - `PlayerDirectionTable`
- `$8C07-$8C0B` (5 bytes) - `FieldPlayerPositionTable`
- `$8D44-$8DD3` (144 bytes) - `FieldPlayerSpriteTable`
- `$8ED1-$8F20` (80 bytes) - `FieldNameText`
- `$9007-$9012` (12 bytes) - `PlayerSpeedFineTable`

## Build

```
Byte-identical ROM verified.
```