Here are my initial routes through all 3 versions for anyone looking to optimize things further:

--trs80 COCO

N, GET BOTTLE, GET LAMP, D, W, ON, GET BOX, W, GET SCEPTER, W, W, DROP SCEPTER, GET BIRD, GET SCEPTER,

W, D, S, GET GOLD, N, W, WAVE SCEPTER, W, GET JEWELRY, N, S, E, S, S, S, S, N, E, E, NW,

GET GOLD, GET JEWELRY, GET CHEST, SE, N, D, E, E, E, E, U, DROP GOLD, DROP JEWELRY, DROP CHEST, PANEL, S, GET SILVER, S, THROW BIRD, DROP BOX

S, GET DIAMOND, N, W, GET COINS, E, N, N, PANEL, DROP BARS, DROP DIAMOND, DROP SCEPTER, PANEL,

S, D, W, D, W, N, DROP LAMP, DROP BOTTLE,

W, GET EMERALD, E, GET LAMP, GET BOTTLE, GET VASE, SE, U, GET PILLOW, W, W, W, D, POUR WATER,

U, E, E, E, U, E, E, D, GET WATER, U, W, W, D, W, W, W, D, POUR WATER, CLIMB, W, GET EGGS, N, GET KEY, S, S,

CLIMB, U, E, E, E, N, OPEN SARCOPHAGUS, D, D, GET PEARL, U, U, S, U, E, U, N, PANEL, DROP EMERALD,

DROP PILLOW, DROP VASE, DROP PEARL, DROP KEY, DROP EGGS, SCORE

-- trs80

N, GET BOTTLE, GET LAMP, D, W, ON, GET BOX, W, GET SCEPTER, W, W, DROP SCEPTER, GET BIRD, GET SCEPTER,

W, D, S, GET GOLD, N, W, WAVE SCEPTER, W, GET JEWELRY, N, S, E, S, S, S, S, N, E, E, NW,

GET GOLD, GET JEWELRY, GET CHEST, SE, N, D, E, E, E, E, U, DROP GOLD, DROP JEWELRY, DROP CHEST, PANEL, S, GET SILVER, S, THROW BIRD, DROP BOX

S, GET DIAMONDS, N, W, GET COINS, E, N, N, PANEL, DROP DIAMONDS, DROP BARS, DROP COINS, DROP SCEPTER, PANEL,

S, D, W, D, W, DROP BOTTLE, N, DROP LAMP,

W, GET EMERALD, E, GET LAMP, GET VASE, SE, DROP EMERALD, U, GET PILLOW, W, GET EMERALD, GET BOTTLE, W, W, D, POUR WATER,

U, E, E, E, U, E, E, D, GET WATER, U, W, W, D, W, W, W, D, POUR WATER, CLIMB, W, GET EGGS, N, GET KEY, S, S,

CLIMB, U, E, E, E, N, OPEN SARCOPHAGUS, D, D, GET PEARL, U, U, S, U, E, U, N, PANEL, DROP EMERALD,

DROP PILLOW, DROP VASE, DROP PEARL, DROP KEY, DROP EGGS, SCORE

-- PC REMAKE

N, GET BOTTLE, GET LAMP, ON LAMP, D, W, GET BOX, W, GET SCEPTER, W, W, DROP SCEPTER, GET BIRD, GET SCEPTER,

W, D, S, GET GOLD, N, W, WAVE SCEPTER, DROP SCEPTER, W, GET JEWELRY, N, S, E, S, S, S, N, E, E, NW,

GET GOLD, GET JEWELRY, GET CHEST, SE, N, D, E, E, E, E, U, DROP CHEST, DROP GOLD, DROP JEWELRY, PANEL,

S, GET SILVER, S, THROW BIRD, DROP BOX, S, GET DIAMOND, N, W, GET COINS, E, N, N, PANEL, DROP DIAMOND, DROP BARS, DROP COINS, PANEL,

S, D, W, D, W, N, DROP LAMP, DROP LAMP, DROP BOTTLE, W, GET EMERALD, E,

GET LAMP, GET BOTTLE, GET VASE, SE, U, GET PILLOW, W, W, W, D, POUR WATER,

U, E, E, E, U, E, E, D, FILL BOTTLE, U, W, W, D, W, W, W, D, POUR WATER, CLIMB, W, GET EGGS, N, GET KEY, S, S,

CLIMB, U, E, E, E, N, OPEN SARCOPHAGUS, GET KEY, DROP BOTTLE, D, D, GET PEARL, U, U, S, U, E, U, N, PANEL, DROP EMERALD,

DROP PILLOW, DROP VASE, DROP PEARL, DROP KEY, DROP EGGS, SCORE