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xanthrou

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Everything posted by xanthrou

  1. I prefer the glue logic one. The speed then would be around 2.38 Mhz in order to communicate with FPGA SID. And what about rest of the components?
  2. If you correctly read it, this is an FPGA recreation of SID, which has all the bells and tolls of the original, and which is not VERA PSG. So, the Z80 asked the 65c02 to reroute the DAC, YM2151 and VERA PSG/PCM to the former, so Z80 could place them onto dedicated sound RAM instead, plus few extras like mixed with FPGA SID and the speech synthesiser, freeing up RAM for other things. Should I raise the MHz's higher or should I keep it as-is?
  3. This is how my (poorly made) design of that daughterboard looks like. Again, not a hardware expert, but I gave it a shot. Any questions or criticisms?
  4. While I am not an expert in hardware, nor do I have resources for all that, I made a rough draft/sketch of how our expansion card would look like. I would some day show you how would it look like. So, we have GUS-like setup for playing back samples, sound effects and voice samples, a speech synthesizer chip, a Z80, dedicated sound RAM and a SID. (with a middleman chip to talk to with 65C02) On non sound-related features, I might add CP/M compatibility (which is what Commodore did with 128, so several KayPro and Osborne files would be read and write to from X16) and some BASIC enhancements, mainly commands for graphics. (a la C128) How does it sound?
  5. The GUS is a great idea (plus I would like to add a speech synthesizer chip in there, just in case), but how would the X16 have a SID card? I mean, isn't VERA PSG based on that? If we added SID, it's basically VERA with 19 channels instead of 16.
  6. I apologize. I totally forgot the possible cost of X16. Due to X16 having exceptional sound and graphics. (Unrelated to the topic, but it might be likely for expansion cards with 3D polygon rendering to have a bigger attention to X16 power users/overkillers than the rest of expansion cards)
  7. In my opinion, PS/2 compatible ports are still made, and the reason why X16 has PS/2 instead of USB is because the former is easier to implement than the latter. Plus, I personally think this post is spam...
  8. That's entirely true and I am not disagreeing with you at all. I'm just pointing out what the X16 offers, where you won't find in Neo-Geo. Just to let you know that X16 sound can be tough as well, not like your average Commodore machines. For some, with the 26 channels and 128 kilobytes of VRAM and 256 color modes, some people would call X16 'the Neo-Geo of 8-bit home computers'. We can do that with the magic of expansion cards, but I doubt it would be supported by a lot of programs.
  9. Mind you that these 11 channels are 3 square wave channels, a noise generator channel and 7 ADPCM channels. (one is around 65 kHz, other six are circa 18kHz). In VERA however, we have PSG and PCM. But not only that, they are 16 channels, more than the 11 ones. And since it's based loosely on SID, you can use pulse (with variable duty cycles), triangle, sawtooth and noise channels and like SID, you can dynamically change the waves, giving an illusion of more than actual channels. Neo-Geo may have 15 channels, but X16 has 26, an overwhelming number of sound channels for an ordinary 8-bit home computer for general use.
  10. Even with some trickery in sound, there's still memory banking, in addition of 39 kilobytes of RAM. Plus, we know that VERA has its own 128kB of VRAM. So there's still space for other things.
  11. Let's mention that there are 3 SSG square wave channels, 1 noise generator channel and 7 ADPCM ones in YM2610. The VERA PSG+PCM, based loosely on SID, has 16 channels of noise, triangle, pulse (not just square, since it has multiple duty cycles) or sawtooth (and ability to be used as PCM), depending on how you use it, plus you can dynamically change the sound waves quickly, much like SID, which is much more channels than SSG, noise and ADPCM combined. Neo-Geo has 15 channels, X16 has overwhelmingly 26 channels, an absurdly large number of sound channels for an 8-bit home computer. By the way, what is 331 Mega?
  12. So, since the YM2151 and YM3012 DAC are going to stay, with YM2151, YM3012 and VERA PSG+PCM, how would we compare the X16 audio capabilities to say like Neo Geo?
  13. YM2151 + YM3012 DAC + VERA PSG + VERA PCM = sounds like a 16-bit arcade machine.
  14. I apologize for misunderstandings. Though is it possible to use VERA PCM and YM3012 simutaniously?
  15. Just in case I made an unofficial box art, for a game or software ported to X16. How's it?
  16. SD sockets are backwards-compatible with MMC cards, jtlyk.
  17. To clarify myself better, I meant in the community downloads.
  18. Yeah, but there are more games and programs that use YM chip than the ones with VERA PSG.
  19. Since there are only YM2151, DAC and VERA PSG left, is there still any chance of the FM chip getting scrapped when X16 was finalized?
  20. In theory, you could make an expansion port (the problem is that it would render the game unplayable once the second phase took off), kinda similar to 32X, but better, to make DOOM work.
  21. I have some other questions about X16. Since SD sockets can also use MMC cards most of the time, is this the case in X16? If X16 loses YM2151 in the final, what impact would it deliver to the retro computer? And is it possible to switch 6502 CPUs with say, like C64?
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