Using the SSG sound channels: Difference between revisions
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m (Created page with "<pre> .org $8 push af ld a, d out (4), a ;Set YM2610 "Port A" register D to value E ld a, e out (5), a pop af </pre> <pre> FastBeep: ld de, 0040h …") |
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| Line 1: | Line 1: | ||
<pre> | <pre> | ||
.org $8 | .org $8 | ||
push af | push af ;Set YM2610 "Port A" register D to value E | ||
ld a, d | ld a, d | ||
out (4), a | out (4), a | ||
ld a, e | ld a, e | ||
out (5), a | out (5), a | ||
| Line 11: | Line 11: | ||
<pre> | <pre> | ||
FastBeep: | FastBeep: | ||
ld de, 0040h ;Channel | ld de, 0040h ;Channel 1 frequency: 2kHz | ||
rst 08h | rst 08h | ||
ld de, 0100h | ld de, 0100h | ||
rst 08h | rst 08h | ||
ld de, 0B0Fh ;EG | ld de, 0B0Fh ;EG period: $50F | ||
rst 08h | rst 08h | ||
ld de, 0C05h | ld de, 0C05h | ||
rst 08h | rst 08h | ||
ld de, | ld de, 0810h ;Channel's 1 amplitude is tied to the EG | ||
rst 08h | rst 08h | ||
ld de, | ld de, 0D08h ;EG shape: Repetitive ramp down | ||
rst 08h | rst 08h | ||
ld de, | ld de, 070Eh ;All channels except 1 are off | ||
rst 08h | rst 08h | ||
ret | ret | ||
</pre> | </pre> | ||
| Line 32: | Line 33: | ||
<pre> | <pre> | ||
SSG_Silence: | SSG_Silence: | ||
ld de, 0800h ; | ld de, 0800h ;SSG channel 1 volume = 0 | ||
rst 08h | rst 08h | ||
ld de, 0900h ; | ld de, 0900h ;SSG channel 2 volume = 0 | ||
rst 08h | rst 08h | ||
ld de, 0A00h ; | ld de, 0A00h ;SSG channel 3 volume = 0 | ||
rst 08h | rst 08h | ||
ld de, 070Fh ;Disable all channels | ld de, 070Fh ;Disable all channels | ||
| Line 43: | Line 44: | ||
</pre> | </pre> | ||
[[Category: | [[Category:HowTo]] | ||
[[Category:Code]] | [[Category:Code]] | ||
Revision as of 05:59, 16 April 2011
.org $8 push af ;Set YM2610 "Port A" register D to value E ld a, d out (4), a ld a, e out (5), a pop af
FastBeep: ld de, 0040h ;Channel 1 frequency: 2kHz rst 08h ld de, 0100h rst 08h ld de, 0B0Fh ;EG period: $50F rst 08h ld de, 0C05h rst 08h ld de, 0810h ;Channel's 1 amplitude is tied to the EG rst 08h ld de, 0D08h ;EG shape: Repetitive ramp down rst 08h ld de, 070Eh ;All channels except 1 are off rst 08h ret
SSG_Silence: ld de, 0800h ;SSG channel 1 volume = 0 rst 08h ld de, 0900h ;SSG channel 2 volume = 0 rst 08h ld de, 0A00h ;SSG channel 3 volume = 0 rst 08h ld de, 070Fh ;Disable all channels rst 08h ret