6000-nin no Sensei-tachi ga Tsukutta Tanoshii Shougakkou Tanken 1

6000-nin no Sensei-tachi ga Tsukutta Tanoshii Shougakkou Tanken 1
Developer: Sega Publisher: Sega Platform: Sega Pico Released in JP: September 30, 1999 This game has a hidden sound test.

Sound Test

When page 0 is loaded, some subroutines are indirectly referenced. However, two for this sound test aren't loaded:

000d8cae 22 71 00 00     movea.l    (0x0,A1,D0w*0x1)=>000d8cb6,A1 = 000d8cf8
000d8cb2 4e 91           jsr        (A1)
000d8cb4 4e 75           rts
000d8cb6 00 0d 8c f8     addr       LAB_000d8cf8 ; load ascii graphics
000d8cba 00 0d 90 76     addr       LAB_000d9076 ; page0 subroutine1
000d8cbe 00 0d 90 9a     addr       LAB_000d909a ; page0 subroutine2
000d8cc2 00 0d 93 78     addr       LAB_000d9378
000d8cc6 00 0d 93 b2     addr       LAB_000d93b2
000d8cca 00 0d 8c da     addr       LAB_000d8cda
000d8cce 00 0d 8c e6     addr       LAB_000d8ce6
000d8cd2 00 0d 93 d2     addr       LAB_000d93d2 ; sound test subroutine1
000d8cd6 00 0d 95 de     addr       LAB_000d95de ; sound test subroutine2

We can patch two of the loaded subroutines to instead load the sound test:

000d8cbc = 93 d2
000d8cc0 = 95 de

Controls:

Down/Up	Increment / Decrement sound type
Right/Left	Increment / Decrement sample index
Red button	Play sound

(Source: Original TCRF research)