| mjg59_ | minute: Thanks! | 00:02 |
|---|---|---|
| + apolkosnik (~apolkosni@pool-74-110-135-248.rcmdva.fios.verizon.net) | 03:40 | |
| - zip100- (QUIT: Ping timeout: 272 seconds) (~zip100@193.32.248.173) | 04:52 | |
| + zip100 (~zip100@185.209.196.181) | 04:54 | |
| - apolkosnik (QUIT: Quit: Client closed) (~apolkosni@pool-74-110-135-248.rcmdva.fios.verizon.net) | 04:56 | |
| + norly_ (~norly@zhong.enpas.org) | 09:19 | |
| + neoman_ (neoman@ancientspledge.com) | 09:21 | |
| - neoman (QUIT: Remote host closed the connection) (neoman@ancientspledge.com) | 09:21 | |
| - norly (QUIT: Ping timeout: 246 seconds) (~norly@zhong.enpas.org) | 09:21 | |
| - zip100 (QUIT: Ping timeout: 246 seconds) (~zip100@185.209.196.181) | 09:21 | |
| + zip100 (~zip100@185.209.196.181) | 09:24 | |
| AiO | minute: hm... i don't understand the pin out then... the AUD-header has two left and two right and one common ground. one pair is named "filtered" the other pair is not in the manual. now i put a heftier cable on the "filtered" pair, and it's definetly still some hum/noise going on, but it works at least. the other pair *must* be something else than audio. | 09:59 |
| minute | AiO: yeah probably on the aa3000 it's something else. on the a3000 it's audio. | 10:01 |
| AiO | because.. the audio circuit of the Amiga does not (as far as i undersand) can not output both filtered and unfiltered audio at the same time (i could be wrong). | 10:01 |
| AiO | s/does not// | 10:02 |
| AiO | at least, i've concluded that the little 3-pin cable is way more prone to pick up "radio noise" than the once i have connected now. | 10:03 |
| AiO | probably a shielded cable would be even better. | 10:04 |
| minute | AiO: interesting findings | 10:28 |
| AiO | s/once/ones/ | 10:30 |
| AiO | but. the *best* quality - i definetly get from tapping the RCA:as of the motherboard instead of going through the video-expansion port of the Zorro/ZZ | 10:31 |
| AiO | so. since there is this CD-In thing on AA3000, one last experiment would be to take the AX output to that instead, and only use the RCA's on the motherboard to the amplifier/other equipment | 10:32 |
| AiO | letting the AA do the mixing | 10:32 |
| minute | interesting | 10:32 |
| AiO | it looks like the AX it-self are maknig snaps, cracle and pops randomly | 11:03 |
| AiO | ah. right. when the internal paula connector is floating it picks up a shit load of snaps and crackles from somewhere... | 11:08 |
| AiO | putting a jumper, shorting GND and R remove all that | 11:10 |
| AiO | (on the paula-input-header of the AX) | 11:10 |
| AiO | it's always the right channel | 11:11 |
| AiO | hm | 11:11 |
| AiO | letting the AA3000 do the mixing is definetly the least noisy (onice i shorted the paula input of the AX), taking the 16-bit audio from AX to CD-in, however the output levels are a bit too low for that mixer. so Paula gets way louder compared to the "CD"-in | 11:12 |
| AiO | so... i *suspect* AX is not supposed to act this way. some decupling gone wrong? i will now sample the output so that you get a feel of the level of noise when i remove the jumper | 11:14 |
| AiO | minute: https://www.aio.nu/zz9000.wav here you *clearly* can hear what happens when i let the ground and red float :) (warning... lower the volume of your headphones/speakers!) | 11:31 |
| AiO | minute: going back to the delivered 3pin cable... i am moving it around abit over the card.. if i put it *along* the ribon cable i get best audio.. if i move it to the back of the board on the side of the cable it's horrific, and also if i let it float as far in as it can reach, it's also noisy... so.. if i tape it *to* the length of ribbon cable... i get the least amount of noise :D | 11:33 |
| AiO | hehe. this feels like my old days dealing with music studios... put the coffe-cup over here. no noise... put it over here. much noise. :D | 11:35 |
| AiO | the sample i sent you was recorded from the right channel of the audio out of the AX | 11:35 |
| AiO | left channels eems to behave better | 11:35 |
| AiO | s/ee/see/ | 11:35 |
| minute | wow, finding things in gitlab service desk is really hard | 12:02 |
| minute | (trying to find the discussion about custom screen mode mul/div/div2 formula) | 12:02 |
| minute | mjg59_: ok, it wasn't actually an email https://www.a1k.org/forum/index.php?threads/66615/page-179#post-1670052 | 12:06 |
| minute | 100*15/1/20 = 75 | 12:06 |
| minute | 100*15/1/60 = 25 | 12:06 |
| minute | so 100mhz is the input clock | 12:06 |
| minute | 100*MUL/DIV/DIV2 | 12:06 |
| minute | one needs to check clocking wizard code/docs to see which limitations apply, it's a bit complicated | 12:12 |
| AiO | minute: ok... here is my conclustion. my AX simply is not working as it should :( here's why: if i have my motherboard RCA:s connected to my amplifier... and if i connect the 3-pin cable between the AX and the ZZ, the output of the RCA:s on the motherboard get the same noise/crackled sound. also see my wav-file i sent. that's not plausable amount of noise with right channel lifted/grounded. | 13:57 |
| AiO | minute: (as soon as i disconnect the 3-pin) the noise/cracle disappears | 14:06 |
| AiO | minute: if i have my amplifier connected to the audio out of the AX, see .wav | 14:06 |
| AiO | minute: (it's playing an mp3 on MHI in the background) | 14:07 |
| minute | AiO: which country are you in, maybe we could do a swap with a new card to see if that helps | 14:07 |
| AiO | minute: sweden | 14:07 |
| minute | AiO: sounds good. if you contact support@mntre.com with a warranty request, we can process it | 14:07 |
| AiO | minute: gr8. will do | 14:07 |
| AiO | minute: hm... is the paula mixing mainly software? | 14:46 |
| minute | AiO: no, part hardware (op-amp and resistors on the ax) and part firmware (dsp mixing levels) | 14:46 |
| minute | wait, there's also some register you can poke | 14:47 |
| AiO | minute: because... if i cold-start the machine with red and gnd shorted with a jumper, and then remove it, and connect the paula audio to the header the crackles and noise is reduced when playing a ProTracker module. | 14:51 |
| AiO | minute: because... there is a significant "power on pop" from both the AX itself and from Paula... which might screw something up in "calibration" (if something like that is done) | 14:52 |
| AiO | minute: default behaviuor (on my AX) seem to be hyper-boosted from some aspect due to the noise levels i experience. | 14:59 |
| AiO | minute: is there such "dsp mixing auto leveling" thing in the start-up? | 15:00 |
| minute | AiO: no, but might be an effect of the opamps | 15:03 |
| AiO | ok... yeah, i've had an old-school Alesis MIDI-Verb III with very similar symptoms on op-amps after a cap died. | 15:06 |
| minute | hm | 15:06 |
| AiO | minute: what's the register poking? and what does it do? :) | 16:39 |
| + apolkosnik (~apolkosni@pool-74-110-135-248.rcmdva.fios.verizon.net) | 18:20 | |
| apolkosnik | Howdy | 18:20 |
| - apolkosnik (QUIT: Ping timeout: 256 seconds) (~apolkosni@pool-74-110-135-248.rcmdva.fios.verizon.net) | 18:30 | |
| mjg59_ | minute: Awesome, thanks! I've had fun with PLL setup before. https://www.xilinx.com/products/intellectual-property/clocking_wizard.html is the wizard in question? | 18:58 |
| minute | mjg59_: yes, i use an instance of that IP and it has some registers exposed over AXI, and the xilinx C API stuff talks to that | 19:08 |
| mjg59_ | Perfect | 19:17 |
| mjg59_ | Also, is the debug command for setting a custom video mode guaranteed to be supported? It would make my life easier in this case :) | 19:18 |
| minute | mjg59_: should be, but i don't remember trying it myself... that was contributed by Bnu back in the day | 19:19 |
| minute | if it works, would be nice to wire that up in the driver at some point | 19:20 |
| + apolkosnik (~apolkosni@pool-74-110-135-248.rcmdva.fios.verizon.net) | 20:49 | |
| - apolkosnik (QUIT: Quit: Client closed) (~apolkosni@pool-74-110-135-248.rcmdva.fios.verizon.net) | 21:04 | |
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