SpritesMind.Net

Posted: **Fri Sep 28, 2007 11:10 am**

As Shiru said, the note freq number list in Sega manual for YM2612 is wrong, so I'm asking who can give me the right one ?

Posted: **Fri Sep 28, 2007 4:34 pm**

I got this from BasiEgaXorz manual and it sounds very accurate to me.
I also included the noise generation description from the manual.

In BEX, it works GREAT!

Code: Select all

Notes to Frequency to PSG Conversion Table 

Note PSG Hertz    Note PSG Hertz 
A 3    7 110.00   B 5  798 493.88 
A# 3  64 116.54   C 6  810 523.25 
B 3  118 123.47   C# 6 822 554.37 
C 4  169 130.81   D 6  834 587.33 
C# 4 217 138.59   D# 6 844 622.25 
D 4  262 146.83   E 6  854 659.26 
D# 4 305 155.56   F 6  864 698.46 
E 4  345 164.81   F# 6 873 739.99 
F 4  383 174.61   G 6  881 783.99 
F# 4 419 184.99   G# 6 889 830.61 
G 4  453 195.99   A 6  897 880.00 
G# 4 485 207.65   A# 6 904 932.32 
A 4  516 220.00   B 6  911 987.77 
A# 4 544 233.08   C 7  917 1046.5 
B 4  571 246.94   C# 7 923 1108.7 
C 5  596 261.63   D 7  929 1174.7 
C# 5 620 277.18   D# 7 934 1244.5 
D 5  643 293.66   E 7  939 1318.5 
D# 5 664 311.13   F 7  944 1396.9 
E 5  685 329.63   F# 7 948 1480.0 
F 5  704 349.23   G 7  953 1568.0 
F# 5 722 369.99   G# 7 957 1661.2 
G 5  739 391.99   A 7  960 1760.0 
G# 5 755 415.31   A# 7 964 1864.7 
A 5  770 440.00   B 7  967 1975.5 
A# 5 784 466.16   C 8  971 2093.0 

Middle C = 261.63Hz = C 5

Noise Generator

MSB: 0 0 0 0 0 FB NF1 NF0 :LSB 

FB Noise type 
0 Periodic (like low-frequency tone) 
1 White (hiss) 

NF1 NF0 Noise Generator Clock Source  
0   0   Clock/2 [Higher pitch, "less coarse"]  
0   1   Clock/4  
1   0   Clock/8 [Lower pitch, "more coarse"]  
1   1   Tone Generator #3

Posted: **Fri Sep 28, 2007 5:01 pm**

Table above for PSG, TmEE asked about YM2612...

My table, which I use in TFM MM for VGM exporter: 645,683,724,767,812,861,912,966,1024,1085,1149,1217 (for 3.83MHz YM's clock)

Note that main problem not in YM or PSG freq tables (it's not big deal if music sounds slightly higher or lower). They just must be tuned up together. So you can correct PSG table instead of YM, if you want.

Posted: **Sat Sep 29, 2007 8:18 am**

Actually the PSG table has some use to me, as mine is generated by a quickly written QB program, and is slightly inaccurate. Thanks both of you

SpritesMind.Net

YM2612 notes...

YM2612 notes...