User Tools

Site Tools


base:ntsc_frequency_table

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

base:ntsc_frequency_table [2015-04-17 04:33] (current)
Line 1: Line 1:
 +====== NTSC frequency table ======
  
 +Note by Frantic: Strictly speaking, this table correct for the 6567R8 VIC, used in most NTSC machines. It is slightly incorrect for the 6567R56A VIC (which has 262 lines with 64 cycles per line instead of 263 lines with 65 cycles per line). Nevertheless,​ it is still a relatively good approximation even for the 6567R56A VIC, so for most purposes it is safe to use on any NTSC machine.
 +
 +<​code>​
 +FreqTableNtscLo:​
 + ;      C   ​C# ​ D   ​D# ​ E   ​F ​  ​F# ​ G   ​G# ​ A   ​A# ​ B
 +                .byte $0c,​$1c,​$2d,​$3f,​$52,​$66,​$7b,​$92,​$aa,​$c3,​$de,​$fa ​ ; 1
 +                .byte $18,​$38,​$5a,​$7e,​$a4,​$cc,​$f7,​$24,​$54,​$86,​$bc,​$f5 ​ ; 2
 +                .byte $31,​$71,​$b5,​$fc,​$48,​$98,​$ee,​$48,​$a9,​$0d,​$79,​$ea ​ ; 3
 +                .byte $62,​$e2,​$6a,​$f8,​$90,​$30,​$dc,​$90,​$52,​$1a,​$f2,​$d4 ​ ; 4
 +                .byte $c4,​$c4,​$d4,​$f0,​$20,​$60,​$b8,​$20,​$a4,​$34,​$e4,​$a8 ​ ; 5
 +                .byte $88,​$88,​$a8,​$e0,​$40,​$c0,​$70,​$40,​$48,​$68,​$c8,​$50 ​ ; 6
 +                .byte $10,​$10,​$50,​$c0,​$80,​$80,​$e0,​$80,​$90,​$d0,​$90,​$a0 ​ ; 7
 +                .byte $20,​$20,​$a0,​$80,​$00,​$00,​$c0,​$00,​$20,​$a0,​$20,​$40 ​ ; 8
 +     
 +FreqTableNtscHi:​
 + ;      C   ​C# ​ D   ​D# ​ E   ​F ​  ​F# ​ G   ​G# ​ A   ​A# ​ B
 +                .byte $01,​$01,​$01,​$01,​$01,​$01,​$01,​$01,​$01,​$01,​$01,​$01 ​ ; 1
 +                .byte $02,​$02,​$02,​$02,​$02,​$02,​$02,​$03,​$03,​$03,​$03,​$03 ​ ; 2
 +                .byte $04,​$04,​$04,​$04,​$05,​$05,​$05,​$06,​$06,​$07,​$07,​$07 ​ ; 3
 +                .byte $08,​$08,​$09,​$09,​$0a,​$0b,​$0b,​$0c,​$0d,​$0e,​$0e,​$0f ​ ; 4
 +                .byte $10,​$11,​$12,​$13,​$15,​$16,​$17,​$19,​$1a,​$1c,​$1d,​$1f ​ ; 5
 +                .byte $21,​$23,​$25,​$27,​$2a,​$2c,​$2f,​$32,​$35,​$38,​$3b,​$3f ​ ; 6
 +                .byte $43,​$47,​$4b,​$4f,​$54,​$59,​$5e,​$64,​$6a,​$70,​$77,​$7e ​ ; 7
 +                .byte $86,​$8e,​$96,​$9f,​$a9,​$b3,​$bd,​$c9,​$d5,​$e1,​$ef,​$fd ​ ; 8
 +</​code>​
base/ntsc_frequency_table.txt ยท Last modified: 2015-04-17 04:33 (external edit)