Harvest Moon 64 (harvestwhisperer/hm64-decomp, US build)

In the US release, a crop is a run of tile numbers in groundObjectsInfo, each growth stage a dry tile followed by its watered twin. The watering can turns a waterable tile into the next number (dry soil into watered soil). Each night, updateGroundObjectsOvernight reads a flag byte per tile: a watered stage moves on to the next stage's dry tile, watered soil and a watered ripe crop go back to dry, and a dry stage stays where it is. So a crop grows one stage per watered day and a dry day doesn't count. Worked out from the table (computed), the watered days from sowing to ripe are: turnip 4, potato 6, strawberry 6, moondrop flower 6, cabbage 7, eggplant 7, pink cat mint 8, tomato 9, corn 13. Grass's stages aren't waterable and advance every night: 9 nights from seed. harvest-moon-64/crop-days

About: Harvest Moon 64 Crop growth

{
 "turnip": 4,
 "potato": 6,
 "strawberry": 6,
 "moondrop": 6,
 "cabbage": 7,
 "eggplant": 7,
 "pinkCatMint": 8,
 "tomato": 9,
 "corn": 13,
 "grass": 9
}

The table's index is the tile number, so row n sits on line 38 + n. The greenhouse loop (lines 1384 onward) applies the same flags. The blue mist flower, on its own plot by the pond, follows a separate branch and isn't counted here. The seed stages' flag bytes also carry 0x08 (0x08 dry, 0x09 watered, against 0x00 and 0x01 for later stages); the overnight update doesn't read that bit.

Cited by: Crop growth, Harvest Moon 64

In the US release, picking a ripe tomato, ear of corn, or eggplant puts back an earlier stage (tile 0x5F, TOMATO_PLANT_STAGE_1; 0x7A, CORN_PLANT_STAGE_1; 0x2A, EGGPLANT_STALK_STAGE_1) under a comment reading "replace with stalks", so the plant ripens again after 3, 4, and 3 more watered days (computed from the table). Any other crop picked leaves soil (dry or watered, as the ripe tile was) or a bare tile. harvest-moon-64/crop-regrowth

About: Harvest Moon 64 Crop growth

{
 "tomato": 3,
 "corn": 4,
 "eggplant": 3
}

In the US release, the farm's overnight update has a rule for the night that starts a season (the day of the month is 1 by then). Summer turns sprouted-or-older turnips, potatoes, and cabbages into dead plants and their seed stages back into tilled soil. Autumn does the same to tomatoes, corn, moondrop flowers, and pink cat mint, and sends any spring seed stages to tilled soil. Winter clears dry tilled soil, weeds, eggplants at every stage, the dead plants, and the remaining seed stages to the bare tile. Spring turns grass back to cut grass and returns tilled soil to the bare tile when getRandomNumberInRange(0, 5) >= 3. Strawberries, whose seeds sow only in the greenhouse, appear in none of the lists, and the greenhouse loop has no season rule. harvest-moon-64/season-change

About: Harvest Moon 64 Crop growth

The season check runs after the night's growth step, so a crop watered on the last day of a season still dies. Winter's list names dry tilled soil (TILLED) but not watered soil. The Japanese build's winter list differs by one range (#ifdef _JP, lines 1357 to 1361): only the US one also clears dead moondrop flowers there. Tiles 0xD7 and 0xD8, unnamed in the decompilation, go to tilled soil in spring, summer, and autumn and to the bare tile in winter.

Cited by: Crop growth, Harvest Moon 64

In the US release, each night the new day's weather is set before the crops update; then, if it is rain, updateCropsIfRain turns every waterable tile on the farm into its watered twin, as the watering can would, so a rainy day counts as watered. The greenhouse isn't touched. harvest-moon-64/rain-waters

About: Harvest Moon 64 Crop growth

The same function also waters the pond's blue mist flower plot.

Cited by: Crop growth, Harvest Moon 64

In the US release, updateClock adds a day to the date and the day of the week when the hour rolls over to 6:00, and going to bed sets the clock to 6:00 and adds the day itself. Day 31 becomes day 1 of the next season, and the fifth season is spring of the next year: four seasons of 30 days, with the year capped at 99. harvest-moon-64/calendar

About: Harvest Moon 64 Calendar

{
 "daysPerSeason": 30,
 "seasonsPerYear": 4,
 "dayStartsAt": "6:00",
 "maxYear": 99
}

Cited by: Calendar

In the US release, each step of the gameplay loop adds 10 to the clock's seconds, as long as the map's LEVEL_TIME_FLOWS flag is set, no animation has suspended time, and the player entity passes checkEntityMapSpaceDependent and isn't paused; 60 seconds make a minute. So a game minute is 6 steps and a game hour 360. The main loop steps at most once per video retrace (mainLoopUpdateInterval is 1), and the retrace callback counts 60 calls as its cycle. Assuming 60 retraces a second (NTSC's rate is about 59.94), the clock runs at most 10 game minutes per real second, an hour in 6 real seconds (computed under that assumption). The real rate depends on how many steps the game finishes each second, which the atlas hasn't measured. harvest-moon-64/clock-rate

About: Harvest Moon 64 Time of day

{
 "gameSecondsPerStep": 10,
 "stepsPerGameMinute": 6,
 "maxGameMinutesPerRealSecond": 10
}

The retrace callback counts 60 calls as one cycle (vblankCounter > 59, mainLoop.c line 241). A step that runs long makes the loop miss retraces, which slows the clock. The Nintendo fandom wiki's article puts an hour at about 15 real seconds, a lead toward a measurement, not evidence.

Cited by: Time of day

In the US release, toolToFatigueScore gives each tool a stamina cost per charge level: the sickle and hoe 2, 4, and 6; the ax and hammer 1, 2, and 3; the watering can 1, 2, and 6; the milker, bell, brush, clippers, the seed bags, and grass seeds 1; the rest 0. Releasing B subtracts the cost from stamina. If it is raining or snowing, or the hour is before 6:00 or from 18:00, and the player isn't in the greenhouse, the same cost is added to fatigue (out of 100), or half of it once a life-event flag the decompilers name KAPPA_POWER_NUT_GIFT is set. Holding B raises the charge level each time a hold counter reaches 16, up to the tool's upgrade level, while stamina covers the next level's cost. harvest-moon-64/tool-cost

About: Harvest Moon 64 Stamina

{
 "sickle": [
  2,
  4,
  6
 ],
 "hoe": [
  2,
  4,
  6
 ],
 "ax": [
  1,
  2,
  3
 ],
 "hammer": [
  1,
  2,
  3
 ],
 "wateringCan": [
  1,
  2,
  6
 ]
}

The hold counter counts calls of handleToolAction in which the player's animation state has changed, so the atlas doesn't give it in frames. The table declares MAX_TOOLS (30) rows but lists 32. Using a tool whose cost exceeds the remaining stamina triggers the exhaustion action (checkStaminaExhaustionLevel returns 4); the atlas hasn't read what that action does.

Cited by: Harvest Moon 64, Stamina

In the US release, going to bed refills stamina to its maximum and, unless fatigue is at 100, takes 2 points of fatigue off for each hour of sleep before 6:00, 3 with the cushion (life event HAVE_CUSHION): the hour taken is the bedtime, plus 24 if before 6:00, subtracted from 30. Staying up until 6:00 runs the next day's update by another path that doesn't touch stamina or fatigue. Food and drink add the item's stamina value and take off its fatigue value. harvest-moon-64/rest

About: Harvest Moon 64 Stamina

{
 "fatiguePerHourSlept": 2,
 "withCushion": 3,
 "fatigueMax": 100
}

Maximum stamina starts at 100 (initialize.c line 319) and some events raise it by 15, up to MAX_STAMINA (250). checkFatigueLevel returns 3 only at exactly 100.

Cited by: Harvest Moon 64, Stamina

In the US release, a cow's milk size comes from its affection (0 to 255): small at 150 or less, medium from 151 to 220, large from 221, and golden for a cow whose milkType is 0, whatever its affection. harvest-moon-64/milk-affection

About: Harvest Moon 64 Affection

{
 "small": [
  0,
  150
 ],
 "medium": [
  151,
  220
 ],
 "large": [
  221,
  255
 ]
}

The atlas hasn't read what sets milkType to 0.

Cited by: Affection, Harvest Moon 64

In the US release, adjustFarmAnimalAffection scales a change by an adult cow's condition: a happy cow's gains are doubled and a mad or sick cow's halved. Its loss branch negates the scaled amount, -(amount * 2) for mad and sick and -(amount / 2) for happy, and since the amount is already negative, the result is positive: a loss raises a mad, sick, or happy cow's affection, by twice or half the loss (computed). Leaving an adult cow outdoors on a rainy day can trigger this: updateFarmStatusRain makes it mad when getRandomNumberInRange(0, 3) returns 0 and then applies −20, or sick when getRandomNumberInRange(0, 7) returns 0 and then applies −30, and a cow already sick gets −20. harvest-moon-64/cow-mood-sign

About: Harvest Moon 64 Affection

{
 "madOrSickLossMultiplier": -2,
 "happyLossMultiplier": -0.5
}

The decompilation matches the ROM, so the C's arithmetic is the game's. The atlas hasn't seen this in play or found it described elsewhere; it may be a known quirk among players. Baby cows, calves, and pregnant cows take the change as given. Whether getRandomNumberInRange includes its upper bound isn't read here, so the odds aren't given.

Cited by: Affection, Harvest Moon 64