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ThunderBlade
Registered: Jan 2002
Posts: 75 |
resetting the SID
Hi, not sure if this is an awkward question, but... what's the proper way to reset the SID?
When starting various musics, I sometimes, very rarely, notice they sound different like all the other times. It seems to depend which music I played previously!
Inbetween playing musics, currently I just fill $D400 - $D418 with a counting down loop (starting with $D418) with zeroes. Is there a recommended better way?
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iAN CooG
Registered: May 2002
Posts: 3138 |
another example
/MUSICIANS/S/Simon_Laszlo/So_Hard.sid
change the lda #$1f sta $d418 to $0f like it was before and hear. |
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Frantic
Registered: Mar 2003
Posts: 1630 |
Probably enabling the filter for some voice(s) but not selecting any filter type results in silence then.. I guess. Never tried that I think. At least not that I can remember. ...but then this it is not necessarily correct to select low pass filter. It could just as well have been some other type of filter in the original tune, even though low pass filter is probably most common.
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iAN CooG
Registered: May 2002
Posts: 3138 |
search for a9 1f 8d 18 d4: 10489 sid files found
search for a9 0f 8d 18 d4: 3987 sid files found
not so uncommon, and i don't want to search for DMC tunes that set d418 in an indirect way =) |
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SIDWAVE
Account closed
Registered: Apr 2002
Posts: 2238 |
ldx #$1d
lda #0
.sta $d400,x
dex
bpl .
rts
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j0x
Registered: Mar 2004
Posts: 215 |
Quote:
Probably enabling the filter for some voice(s) but not selecting any filter type results in silence then.. I guess.
Sounds like Frantic is probably on the right track. If this is true, is it only true for SID emulation?
Sorry for side-tracking the thread slightly, btw... :( |
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Frantic
Registered: Mar 2003
Posts: 1630 |
Sidwave: Sorry if I am rude now, but I have to say that that was quite a crappy answer to his question. To begin with, $d41d is not a valid SID register at all, and there is no need to write anything to the registers $d419-$d41c which are purely output registers. ...and the whole thread began on the assumption that something more than just writing zeroes to the SID would be relevant.
j0x: I think it may very well be true on the real hardware too, but I don't have it right here where I am at the moment, so I can't tell for sure. |
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SIDWAVE
Account closed
Registered: Apr 2002
Posts: 2238 |
ok Frantic,
i didnt make a sidplayer yet, but what i think will work is:
clear d418, and do a hard restart with no sound, then set filter type.
now the sid will have a filter type when the first note is played, and the ADSR will be reset.
i have a sound like that in SDI:
waveform:
09 00
.01 00
ff .
it resets the sid (as of what i know),
and my filters begin at the correct spot.
this any help ? |
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SIDWAVE
Account closed
Registered: Apr 2002
Posts: 2238 |
this positively works 100% (on 6581 R4 AR anyway), its from a tune i made, i used it many times:
ADSR: 0002
HARD RESTART
FILTER type: 1F (lowpass, max resonance)
WAVEFORM:
01 .
FF .
just a 1.
work every time. |
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Soren
Registered: Dec 2001
Posts: 547 |
SIDwave: what if you don't want to start the tune with hard restart? ;-) |
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SIDWAVE
Account closed
Registered: Apr 2002
Posts: 2238 |
/MUSICIANS/H/Harries_Jan/Equations.sid
Jeff, its just a sid reset that works, that what he asked. |
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