zezba9000 Posted November 23, 2020 Share Posted November 23, 2020 If there is an pre-order / interest list you're keeping I would like to be on it. This looks awesome! Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted November 23, 2020 Share Posted November 23, 2020 Oh and also ... I'm going to also do the "Deep Brinstar" music from Metroid as a demo. That was always my favorite piece from Metroid, and double POKEY will do it justice. 1 Quote Link to comment Share on other sites More sharing options...
7800 Posted November 26, 2020 Share Posted November 26, 2020 (edited) I'd like to be added to the list for this... The fully loaded version. Edited November 26, 2020 by 7800 Quote Link to comment Share on other sites More sharing options...
rj1307 Posted November 26, 2020 Author Share Posted November 26, 2020 I would like to ask for a little more patience, today the test cartridge arrived at Walter I have a few cartridges ready and material for several dozen pieces, but I am waiting for the results of Dragonfly compatibility with different versions of A7800, if there are no major problems, I will start a new thread for sales only, but here will remain the "technical department". 14 1 Quote Link to comment Share on other sites More sharing options...
gambler172 Posted November 27, 2020 Share Posted November 27, 2020 Tests are running very well.... 10 Quote Link to comment Share on other sites More sharing options...
+sramirez2008 Posted November 27, 2020 Share Posted November 27, 2020 16 minutes ago, gambler172 said: Tests are running very well.... Yes! ? 1 Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted November 29, 2020 Share Posted November 29, 2020 So ... Still working out how to do a double POKEY binary, then we should have something for testing on the dragonfly. Quote Link to comment Share on other sites More sharing options...
CPUWIZ Posted November 29, 2020 Share Posted November 29, 2020 I just want to throw out there, that the 7800 RMT supports 2 POKEY's. 1 Quote Link to comment Share on other sites More sharing options...
zezba9000 Posted November 29, 2020 Share Posted November 29, 2020 (edited) Maybe I'm missing something but whats the purpose of multiple POKEYs? Advanced Multi-Core audio processing? One for music and one for sound-FX? Edited November 29, 2020 by zezba9000 Quote Link to comment Share on other sites More sharing options...
juansolo Posted November 29, 2020 Share Posted November 29, 2020 More sounds channels, that's about it on a 7800 because making it stereo would be a royal pain in the arse for everything else given it's got multiple sounds sources as it is. 1 Quote Link to comment Share on other sites More sharing options...
gambler172 Posted November 29, 2020 Share Posted November 29, 2020 At the moment...test number 10 is running..... 3 systems left... 5 Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted November 30, 2020 Share Posted November 30, 2020 20 hours ago, zezba9000 said: Maybe I'm missing something but whats the purpose of multiple POKEYs? Advanced Multi-Core audio processing? One for music and one for sound-FX? Well ... the purpose is NES quality music. Normally each POKEY has 4 sound channels with only 255 frequency dividers. You can use a square wave but limited range, and tuning errors. Sawtooth wave only allows bass frequencies. Triangle is unusable for music without tricks. But: You can combine two channels with 16-bit mode! 65,536 frequency dividers. All waveforms can be used musically, and suddenly we get music on a par with the NES and C64 if not better. 4 16-bit channels if you like, or any number of combinations. Add in tricks like SKCTL or hi pass filtering, and you got a monster. 1 1 Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted November 30, 2020 Share Posted November 30, 2020 20 hours ago, CPUWIZ said: I just want to throw out there, that the 7800 RMT supports 2 POKEY's. Which is good ... except RMT doesn't support my special modes without some hacking lol .. Quote Link to comment Share on other sites More sharing options...
zezba9000 Posted November 30, 2020 Share Posted November 30, 2020 4 minutes ago, Synthpopalooza said: Well ... the purpose is NES quality music. Normally each POKEY has 4 sound channels with only 255 frequency dividers. You can use a square wave but limited range, and tuning errors. Sawtooth wave only allows bass frequencies. Triangle is unusable for music without tricks. But: You can combine two channels with 16-bit mode! 65,536 frequency dividers. All waveforms can be used musically, and suddenly we get music on a par with the NES and C64 if not better. 4 16-bit channels if you like, or any number of combinations. Add in tricks like SKCTL or hi pass filtering, and you got a monster. So am I right in assuming that the Concerto cart will only have one POKEY & the Dragonfly might have two (which is whats being tested now)? Allowing the Dragonfly to have up to 8 channels? Also do only "some" POKEY chips support a 16-bit-rate mode while others only 8-bit? If so I'm assuming both the Concerto & Dragonfly will support these. Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted November 30, 2020 Share Posted November 30, 2020 16-bit mode is standard on all POKEY ... it's controled through AUDCTL (located at POKEYADDR+$08) By setting bits, you can control certain features. Bit 1: Enables 15khz mode to pitch your channels into bass frequencies Bit 2 and 3: Enables a hi pass filter (3 on 1, or 4 on 2) which lets you have a variable pulse wave like NES, or other SID swirling effects. Bits 4 and 5: 16-bit mode (1 and 2, or 3 and 4) ... combines two channels into a 16-bit channel, silence the first, place low and high order bytes in both channels. Bits 6 and 7: 1.79 mhz mode on channel 1 or channel 3. Pitches your notes up. Used in conjunction with 16-bit mode, or with $2x and $Cx distortions Bit 8: 9-bit polycounter enable. Used with the $8x distortion to change from white noise to buzzy guitar tones. Two POKEYs means two AUDCTL registers, with any number of setups possible. For example, $7A (hi pass filter plus 1.79 mhz plus 16-bit mode) burns all four channels, but gives you a very nice SID type swirling variable pulse wave which can be fine tuned using 65,536 settings. I used this in my Metroid krayt demo. And you still get 4 channels free on the second POKEY. There is also SKCTLS two tone filter. By storing $8B in SKCTLS (POKEYADDR+$0F), playing the first channel and silencing the second, play the carrier frequency in the first and the modulation in the second, it also gets you a sort of variable pulse wave, or other neat tricks. Again, with a second POKEY, there's a second SKCTLS register to play with too. 2 Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted November 30, 2020 Share Posted November 30, 2020 Here's an old article which discusses POKEY in regards to 16-bit audio: https://www.atarimagazines.com/compute/issue34/112_1_16-BIT_ATARI_MUSIC.php Short version: You get better note resolution ... while standard 8-bit settings only give you from the third octave up to the 5th octave in $Ax square wave before tuning errors creep in, 16-bit covers 9 octaves without problems. 3 Quote Link to comment Share on other sites More sharing options...
gambler172 Posted November 30, 2020 Share Posted November 30, 2020 Good news. Only one last test for the Dragonfly and till now it looks very promising. 10 Quote Link to comment Share on other sites More sharing options...
Cyprian Posted December 1, 2020 Share Posted December 1, 2020 On 11/26/2020 at 6:05 PM, rj1307 said: I would like to ask for a little more patience, today the test cartridge arrived at Walter I have a few cartridges ready and material for several dozen pieces, but I am waiting for the results of Dragonfly compatibility with different versions of A7800, if there are no major problems, I will start a new thread for sales only, but here will remain the "technical department". great news, my 7800 just flies to me, and would be cool to buy the Dragonfly Quote Link to comment Share on other sites More sharing options...
+darryl1970 Posted December 2, 2020 Share Posted December 2, 2020 On 11/30/2020 at 12:20 AM, Synthpopalooza said: Here's an old article which discusses POKEY in regards to 16-bit audio: https://www.atarimagazines.com/compute/issue34/112_1_16-BIT_ATARI_MUSIC.php Short version: You get better note resolution ... while standard 8-bit settings only give you from the third octave up to the 5th octave in $Ax square wave before tuning errors creep in, 16-bit covers 9 octaves without problems. I obviously didn't think you got this knowledgeable overnight, but I didn't realize you were an expert 37 years ago. That's pretty cool to see that date in 1983! Good times.... 1 1 Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted December 2, 2020 Share Posted December 2, 2020 Well to be fair ... didn't know half then as I do now ... modern tools have helped alot 3 Quote Link to comment Share on other sites More sharing options...
+darryl1970 Posted December 2, 2020 Share Posted December 2, 2020 21 minutes ago, Synthpopalooza said: Well to be fair ... didn't know half then as I do now ... modern tools have helped alot I hear you. I get that, but the lack of modern tools makes that even more impressive. 1 Quote Link to comment Share on other sites More sharing options...
gambler172 Posted December 3, 2020 Share Posted December 3, 2020 Good news....all tests are finished.? 9 Quote Link to comment Share on other sites More sharing options...
Synthpopalooza Posted December 3, 2020 Share Posted December 3, 2020 Yaay. I can't wait to get my hands on it 2 Quote Link to comment Share on other sites More sharing options...
Shaggy the Atarian Posted December 3, 2020 Share Posted December 3, 2020 On 11/28/2020 at 11:47 PM, zezba9000 said: Maybe I'm missing something but whats the purpose of multiple POKEYs? Advanced Multi-Core audio processing? One for music and one for sound-FX? In addition to what Synthapalooza said, there are various real-world examples of games using two Pokeys, thanks to Atari's arcade development. Millipede on modified Centipede hardware; Most vector games such as Black Widow, Tempest, Space Duel, Major Havoc, & Gravitar; then all System I and System II games had a couple of Pokeys (often with some extra chips though, such as voice and a YM2151) Star Wars used 4 Pokeys plus another chip for voice. Should be interesting to see some modern examples of both working though, especially with the tools we've got now! 3 Quote Link to comment Share on other sites More sharing options...
rj1307 Posted December 3, 2020 Author Share Posted December 3, 2020 Please, a little more patience, there was a small problem with the USB but I have already located it, fortunately all you need to do is change the value of a few resistors. By the end of the week I will have a few ready and tested ones, and in a few days I am waiting for the delivery of PCBs and start assembly. For two weeks my 3D printer has been working 12 hours a day doing casing. 13 Quote Link to comment Share on other sites More sharing options...
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