Cybernoid Posted December 4, 2004 Share Posted December 4, 2004 Did I hear that someone has POKEY emulated in an FPGA? Would it be possible to create a 2nd-POKEY cartridge that gives the 8bit a plug-in second audio channel? Just an idea.... Quote Link to comment Share on other sites More sharing options...
classics Posted December 4, 2004 Share Posted December 4, 2004 You should be able to put a regular pokey in a cartridge and use it to play music as long as you dont intend to use any of the interrupts. Quote Link to comment Share on other sites More sharing options...
Wilhelm Posted December 4, 2004 Share Posted December 4, 2004 Really?? that's interesting. Can anyone make a diagram for this?? No matter if there is no eprom in there. Quote Link to comment Share on other sites More sharing options...
Cybernoid Posted December 4, 2004 Author Share Posted December 4, 2004 Yeah, I thought about using a real pokey, but don't want rip apart another machine. It is a good idea, though. I suppose it could be wired similarly to the ethercart... I guess a PBI board could be used if the IRQ is needed... C Quote Link to comment Share on other sites More sharing options...
classics Posted December 4, 2004 Share Posted December 4, 2004 A cartridge housing should have enough room for two pokeys and audio jacks. Best and B&C both sell Pokey chips, and you can get them from 7800 Ballblazer carts (practically worthless collector-wise). Since Atari used them in arcade games a bunch of other people sell them as well at pretty reasonable prices. Software would have to be modified to look for Pokey at D5XX or in the cartridge address range somewhere. I think the biggest issue would be the timers and interrupts, dont most music players use those? Quote Link to comment Share on other sites More sharing options...
Cybernoid Posted December 4, 2004 Author Share Posted December 4, 2004 The 7800 Ballblazer carts have a pokey? I didn't know that. Interesting...how did this work? Hmmm I'll look it up... How does the stereo pokey hardware mod work? Quote Link to comment Share on other sites More sharing options...
belboz Posted December 4, 2004 Share Posted December 4, 2004 Way back when I had my dos based Atari 8-bit emulator (called it Pokey), I made two hardware sound cards that had a Pokey chip on them that my emulator would use for 100% accurate sound output. One was interfaced to the LPT port on the computer, the other was an ISA based card that plugged into a free ISA slot. For both I would pipe the output of the pokey chip into the line in on the sound card on the PC. It is quite easy to interface to the Pokey chip. Quote Link to comment Share on other sites More sharing options...
classics Posted December 4, 2004 Share Posted December 4, 2004 The gumby mod just adds another pokey in memory right above the original pokey chip. It also ignores all the interrupt/serial lines and just uses the audio output. A pokey in a cartridge would basically be the exact same upgrade as Gumby except the location of the 2nd pokey in memory would be different. Quote Link to comment Share on other sites More sharing options...
Heaven/TQA Posted December 4, 2004 Share Posted December 4, 2004 a cart would be nice (as a non hardware guy... same goes with x-box mods... ) a lot of software exists out there regarding stereo pokey... maybe easily patchable for a "cart" version... a pokey cart + stereo chinch plugs so atari can be plugged to the stereo would be nice one... and could be done cheap? Quote Link to comment Share on other sites More sharing options...
classics Posted December 4, 2004 Share Posted December 4, 2004 How difficult is it to interface the C64 SID? A cartridge with one SID and one POKEY would be interesting too. Quote Link to comment Share on other sites More sharing options...
Cybernoid Posted December 4, 2004 Author Share Posted December 4, 2004 I think someone already build an Atari interface for the SID...was it Analmux? Anyway, this is pretty much what I thought... I don't think the players, including RMT, use the irq...so it should be easy. I have seen the source code for the RMT player (let me know if I am wrong), so it could easily be modded to look at $d500... If we put 2 pokeys into a cart and use A7 to select between the two... one at $d500 and the other at $d580, with a stereo jack...It should be easy to do for plug and play Quote Link to comment Share on other sites More sharing options...
Cybernoid Posted December 4, 2004 Author Share Posted December 4, 2004 Where can you get cheap cartridge housings? Quote Link to comment Share on other sites More sharing options...
classics Posted December 5, 2004 Share Posted December 5, 2004 I'll draw up a PCB and see if it fits. With a small enough audio jack it should make a nice little cartridge. Best and B&C both sell Atari style cartridge cases. Steve Quote Link to comment Share on other sites More sharing options...
Cybernoid Posted December 5, 2004 Author Share Posted December 5, 2004 Very cool Steve! I'll modify the RMT player code... very simple. If you can pull a cart together, I'll put an option into the JellyBeans Option menu for "Stereo Pokey Cart Music". Quote Link to comment Share on other sites More sharing options...
sack-c0s Posted December 5, 2004 Share Posted December 5, 2004 SID and POKEY sounds interesting - i love the raw distorted bass you can get from the pokey because it has a real kick to it (and is pretty much inline with what I like from my music in general), but with some nice filtered lead sounds... mmm - anyone want to make a theoretical editor/emulator for this? Quote Link to comment Share on other sites More sharing options...
Cybernoid Posted December 5, 2004 Author Share Posted December 5, 2004 The SID should plug in and direct connect to the CPU nicely: http://stud1.tuwien.ac.at/~e9426444/index.html There might be room in a cart for a SID and a Pokey. Mix them together for a nice Mono cart. Hmmm, interesting.... Sack-c0s, your RMT productions rock. I agree, this type of music is great. There needs to be more bands that use Pokey/8bit-ataris for music!!! Quote Link to comment Share on other sites More sharing options...
classics Posted December 5, 2004 Share Posted December 5, 2004 Very cool Steve! I'll modify the RMT player code... very simple. If you can pull a cart together, I'll put an option into the JellyBeans Option menu for "Stereo Pokey Cart Music". I wired up a prototype, with Pokey's at D500 and D580. If you have something to test it with send me a PM. Steve Quote Link to comment Share on other sites More sharing options...
Cybernoid Posted December 5, 2004 Author Share Posted December 5, 2004 It is on its way... Quote Link to comment Share on other sites More sharing options...
nights Posted December 5, 2004 Share Posted December 5, 2004 what is POKEY and FPGA¿ Quote Link to comment Share on other sites More sharing options...
classics Posted December 5, 2004 Share Posted December 5, 2004 I modified a copy of RMT to play with dual pokeys in the cartridge and it sounds fantastic with headphones. cartpokey.zip Quote Link to comment Share on other sites More sharing options...
Cybernoid Posted December 5, 2004 Author Share Posted December 5, 2004 Most Excellent!!!! Quote Link to comment Share on other sites More sharing options...
Cybernoid Posted December 5, 2004 Author Share Posted December 5, 2004 I modified a copy of RMT to play with dual pokeys in the cartridge and it sounds fantastic with headphones. So, when will you have a PCB made? When will a cart be available for purchase and for how much do you think? This is the fastest I have seen a question go from post to proto-type! Quote Link to comment Share on other sites More sharing options...
Dr. Van Thorp Posted December 5, 2004 Share Posted December 5, 2004 what is POKEY and FPGA¿ Pokey is the sound chip (also interface chip) in old Atari 8-bit computers like the Atari 800. FPGA is a chip that can be reprogramed to perform the functions of all sorts of other chips. Field Programmable Gate Array. It is a chip full of little electronic components that can be programmed and reprogrammed to connect together in different configurations to perform different electronic tasks. Often used for small production runs when it isn't feasable to make a custom chip. Also used in some graphics cards and similar devices. Good for hobby projects. Quote Link to comment Share on other sites More sharing options...
classics Posted December 5, 2004 Share Posted December 5, 2004 I ordered some stereo audio jacks that will probably fit, so once I get those next week and can make up a real pcb drawing. I should have a couple prototypes on finished PCBs at the beginning of the next week. I dont know if there would really be enough interest to sell them? If the prototypes work good I suppose I could do pre-orders to see if there is enough interest. I'm really interested in trying a SID cart as well. Is there any Atari software that can use a sid chip right now? I think I have everything here I would need to prototype one, except the SID, which I can brutalize a c64 for. Quote Link to comment Share on other sites More sharing options...
Heaven/TQA Posted December 5, 2004 Share Posted December 5, 2004 in europe there are several stereo mods... but i am a fan of plug and play (f.e. cart) solutions... maybe carsten (cas) of abbuc can make them overseas available??? i would like to have one... can you make them compatible to the polish stereo upgrades? Quote Link to comment Share on other sites More sharing options...
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