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 Post subject: Re: New SuperGrafx demo
PostPosted: Tue Sep 25, 2012 7:11 am 
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Joined: Sun Mar 19, 2006 9:44 pm
Posts: 924
Location: Japan
If, uh... you want to see the above in action, download my Fractal Engine (2.0) program. It detects SGX hardware (or SGX settings in an emulator) and then uses all 4 layers (2 BG, 2 SPR) to make a 256x240x6bpp fractal. At 512x240 or 512x480 it uses SGX + PCE BGs in unison for higher resolutions/colour count.

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 Post subject: Re: New SuperGrafx demo
PostPosted: Thu Sep 27, 2012 6:22 pm 
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Joined: Wed May 19, 2010 6:12 pm
Posts: 2433
tomaitheous wrote:
Of course, on the PCE and SGX that's per *VDC scanline* and not NTSC scanline. You can setup the VDC to draw two or more scanlines per NTSC scanline, but you'll get a gap between them (the width of hblank since no pixels will be sent to the encoder except color #256; sprite transparency color). The PC-Engine is 256 pixels or 16 16-pixel-wide cells per scanline. Which ever comes first. It doesn't increase with the resolution change either, since the internal fetch/hold buffer isn't larger than that. Which is why most PCE games stick with the 5.37mhz dot clock over the 7.16mhz and 10.74mhz dot clock resolutions. So that's another advantage the SGX has over the PCE. The higher resolutions become more useful in relation to sprites and scanline limits.


Wait what? How many scanlines can it display per scanline?


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 Post subject: Re: New SuperGrafx demo
PostPosted: Thu Sep 27, 2012 11:51 pm 
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Location: Japan
Picture a VGA signal (31khz horiz. freq) but missing an Hsync pulse every odd scanline. That's the picture you'll get if you set up the VDC in certain ways.

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 Post subject: Re: New SuperGrafx demo
PostPosted: Fri Sep 28, 2012 11:08 am 
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Joined: Thu Aug 28, 2008 1:17 am
Posts: 591
Denine wrote:
If I ever will leave NES grounds, I'll go with Genesis or SNES. PC engine sounds interesting, but it have only one BG layer.
Anyway, thanks for tips, guys! I really appreciate it. :D


The PC-Engine can do quite a bit with just one BG layer. Just look at Got: http://www.youtube.com/watch?v=ZEMpyATFRQc (30 min play through). Or Lords of Thunder, or Dracula X.
Or some homebrew doing it:
http://www.youtube.com/watch?v=WnglTbLR8VY (first area)
http://www.youtube.com/watch?v=oabDZSMT93A

There are other examples, but I don't have videos of them.

@tokumaru: There are a lot more than 8 people who own an SGX. A lot of PC-Engine fans own one. The first person who puts out a SGX SuperCD homebrew is gonna hit it big in the PCE retro community. SGX+arcade card CD would be ideal; you'd be surprised how many people own that setup (a lot more than 8 ). Arcade card gives you the normal CD features as well as and extra 2megabytes of ram to play with (on top of the 256k CD RAM). They also added 4 long pointers into the AC memory, so no mapping or fiddling. The four register pointers can self increment and decrement (either on WORD or BYTE read/writes) and the value of the incrementing is a signed 16bit number (each register has its own 'indexer'). There's also a 32bit shifter and barrel shifter, but that's not as a cool as the other stuff on the card. All the new AC regs are mapped into a normally fixed area too (normally open bus), so no bank swapping to access the new regs (kind of like the SNES).

This:
http://www.youtube.com/watch?v=TbljxwgyKOw (stage 1/2)
http://www.youtube.com/watch?v=lr1oSq2SLbA (stage 3/4)
http://www.youtube.com/watch?v=NdQClRBEgrw (stage 5/6)
Would be even more incredible on SGX...




I know homebrew isn't ALL about making money (and not at all for some), but if you picked the CD platform then the cost to manufacture a CD with a manual and case is about $1.20. That's for a pressed CD bundle of 500 with case and manual. Compare that to the cost of a cart+box+manual. Frozen Utopia (PCE homebrew) just released an old school RPG for the system on CD that sold 200 copies as of a couple of weeks ago. At $40 a pop x 200, that's $8000USD. Sure, they include free shipping in that, but you get the idea. I think overall a lot more shmup fans own a PCE/Duo CD unit than RPG fans.


@psycopathicteen: I've done up to 7 in hi res mode, but they were practically useless. Two is easily doable. Here's a game that has a debug mode to show it off:

http://www.youtube.com/watch?v=ENXcn5idTOk
Though they didn't shrink hblank for it. You can shrink it more than what's shown.


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