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AD-ST | Usage during menu system run     | Usage during danmaku engine run
------+----------------------------------+------------------------------------
$8000 | Black screen buffer (1/3)        | * Black screen buffer (1/2)
$8100 | Black screen buffer (2/3)        | * Black screen buffer (2/2)
$8200 | Black screen buffer (3/3)        | * 8-bit sine/cosine table
$8300 | Unused                           | Player portrait buffer
$8400 | Gray screen buffer (1/3)         | * Gray screen buffer (1/2)
$8500 | Gray screen buffer (2/3)         | * Gray screen buffer (2/2)
$8600 | Gray screen buffer (3/3)         | * Enemy portrait buffer
$8700 | Unused                           | 8x8 sprite rotation buffer
$8800 | Unused                           | Bullet allocation table
$8900 | Unused                           | Primary bullet data table (1/4)
$8A00 | Unused                           | Primary bullet data table (2/4)
$8B00 | Unused                           | Primary bullet data table (3/4)
$8C00 | Unused                           | Primary bullet data table (4/4)
$8D00 | Unused                           | Player bullet table
$8E00 | Menu system recordkeeping        | Enemy script data area
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