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CD Reading Process for Monster Rancher 1

How Monster Rancher 1 (NTSC / PlayStation version) determines which monsters are generated when swapping out CDROM data.

Reading the Data
The game will read the following data from a CDROM:
  • Total minutes and seconds
  • Seconds of the first track
  • Total number of tracks In addition to this, pregap is fixed at 2 seconds

Determine the Main Breed
The Main Breed is determined by the total minutes, of the CD and number of tracks it has.
  1. First, if the total seconds are 58 or 59, add 1 to the minutes.
  2. Then, convert the minutes to hexadecimal notation (16 for 9 minutes 59 seconds, 33 for 21 minutes 37 seconds).
  3. Then subtract the total number of tracks from that value.
Main Breed Determination
Minute
Track
MainMinute
Track
MainMinute
Track
Main
0 or lessDino39Hare78Suezo
1Tiger40Gali79Dino
2Jell41Suezo80Hare
3Dino42Naga81Monol
4Tiger43Worm82Naga
5Jell44Tiger83Plant
6Golem45Golem84Tiger
7Worm46Gali85Worm
8Hare47Suezo86Jell
9Plant48Jell87Gali
10Gali49Worm88Dino
11Golem50Tiger89Golem
12Monol51Golem90Gali
13Dino52Dino91Suezo
14Naga53Plant92Naga
15Jell54Hare93Worm
16Monol55Suezo94Dino
17Suezo56Jell95Monol
18Dino57Worm96Tiger
19Suezo58Tiger97Worm
20Tiger59Suezo98Jell
21Hare60Pixie99Suezo
22Plant61Tiger100Hare
23Suezo62Plant101Monol
24Dino63Dino102Naga
25Tiger64Tiger103Plant
26Dino65Golem104Suezo
27Suezo66Dino105Hare
28Hare67Naga106Monol
29Tiger68Dino107Golem
30Dino69Golem108Suezo
31Tiger70Tiger109Tiger
32Jell71Worm110Suezo
33Monol72Jell111Pixie
34Suezo73Suezo112Suezo
35Hare74Worm113Jell
36Tiger75Plant114Worm
37Suezo76Dino115Tiger
38Plant77Hare116 & upDino

Determine Sub Breed & Stat Offsets

The sub breed determination and Stat Offsets are based on two different measurements

  1. The first stat offset is from the total seconds on the disc.
  2. The second stat offset (and sub breed) is from the seconds in the first track, or the starting position of the 2nd track.
However, if the total number of tracks is 1, the seconds of the first track are forcibly applied with 58 seconds (pure breed, no correction)
Sub Determination and Modifiers
Secs ValueSubLIFPOWDEFSKISPDINT
0Golem7-85862
1Golem69-148 3
2 Monol 8 7 7 -4 6 4
3 Suezo 5 10 9 1 -9 5
4 Jell 6 21 5 1 0 -6
5 Worm -5 7 1 1 0 7
6 Monol 7 -1 10 1 6 8
7 Plant 1 8 -1 1 8 9
8 Plant 10 29 4 -4 8 10
9 Naga 18 2 7 2 -8 11
10 Hare 11 1 0 2 9 -12
11 Gali 14 3 5 2 5 13
12 Suezo -13 12 4 2 18 14
13 Worm 15 -13 6 1 5 15
14 Suezo 16 8 -4 1 5 16
15 Tiger 17 8 6 -3 5 17
16 Suezo 11 6 1 3 -5 18
17 Monol 19 4 1 3 1 -19
18 Worm 12 8 10 3 3 0
19 Golem -17 8 7 4 3 1
20 Dino 16 -3 8 18 15 2
21 Pixie 18 2 -9 4 2 3
22 Hare 15 4 7 -1 4 4
23 Tiger 16 10 10 7 -2 5
24 Naga 15 12 21 8 1 -6
25 Tiger 17 8 7 9 8 7
26 Jell -11 8 1 8 9 8
27 Hare 10 -3 8 7 14 9
28 Gali 18 2 -19 4 5 10
29 Jell 11 7 2 -1 5 11
30 Naga 19 6 1 1 -4 12
31 Monol 15 5 3 0 1 -13
32 Golem 12 2 12 8 1 14
33 Suezo -16 1 13 1 5 15
34 Plant 16 -4 8 7 5 16
35 Naga 17 0 -8 1 3 17
36 Hare 12 3 6 -9 11 18
37 Gali 18 9 4 8 -1 19
38 Golem 0 0 0 0 0 0
39 Pixie 0 0 0 0 0 0
40 Naga 0 0 0 0 0 0
41 Jell 0 0 0 0 0 0
42 Dino 0 0 0 0 0 0
43 Worm 0 0 0 0 0 0
44 Hare 0 0 0 0 0 0
45 Tiger 0 0 0 0 0 0
46 Monol 0 0 0 0 0 0
47 Tiger 0 0 0 0 0 0
48 Worm 0 0 0 0 0 0
49 Plant 0 0 0 0 0 0
50 Dino 0 0 0 0 0 0
51 Pixie 0 0 0 0 0 0
52 Dino 0 0 0 0 0 0
53 Gali 0 0 0 0 0 0
54 Jell 0 0 0 0 0 0
55 Plant 0 0 0 0 0 0
56 Dino 0 0 0 0 0 0
57 Pixie 0 0 0 0 0 0
58 Pure breed 0 0 0 0 0 0
59 Pixie -2 7 4 4 6 1

Determining Rare Monsters
  • When the total minutes, seconds, and seconds of the first track reach a certain value, a different monster is born.
  • Monsters whose Main is Dragon or later, or whose Sub is ???, only appear from this point.
  • This information is specific to Monster Farm 1 and is different in the English version of Monster Rancher 1.
Credits: Runasoru/JP Wiki, TheOmniGamer, Teawch, MonsterFenrick
This page was last modified: May 25 2025
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