What is the NEC D91317GD's purpose?

[Sephirothkefka]

One day I was curious to see what made the TG16 CD tick after being impressed with Rondo of Blood 3 layer parallax scrolling. I saw 2 main chips: the Oki MSM5205 (which I know of) and the NEC D91317GD which seems to be a very unusual chip. I saw no info on this at all. It also seems to be in the Super CD ROM² dock. Just what is that chips purpose? Is it a graphics chip? A sound controller? I'm just so confused...

[vestcoat]

I'm not TG16 technical, but remember that the CD-ROM only adds red-book audio and a media format with more storage space, i.e., CD's. The parallex and graphics processing is all in the core hardware.

[Necromancer]

It adds ADPCM too, which is the Oki chip.

[Sephirothkefka]

It adds ADPCM too, which is the Oki chip.

I know that part as I said.

I'm not TG16 technical, but remember that the CD-ROM only adds red-book audio and a media format with more storage space, i.e., CD's. The parallex and graphics processing is all in the core hardware.

Hmm, wgen I looked up the graphics hardware it said it can do only 1 background layer

[Necromancer]

I know that part as I said.

I was obviously replying to vestcoat.

[thesteve]

http://www.pcenginefx.com/forums/index.php?topic=16503.msg342958#msg342958
its a DMA mapper

[Sephirothkefka]

I know that part as I said.

I was obviously replying to vestcoat.

Sorry! 

[Sephirothkefka]

http://www.pcenginefx.com/forums/index.php?topic=16503.msg342958#msg342958
its a DMA mapper

Oh sweet! Well now I need to figure out what makes that 3 layer scrolling in Rondo.

[Sephirothkefka]

http://www.pcenginefx.com/forums/index.php?topic=16503.msg342958#msg342958
its a DMA mapper

Oh sweet! Well now I need to figure out what makes that 3 layer scrolling in Rondo.

Creative use of sprites?

Maybe...

[Sadler]

Oh sweet! Well now I need to figure out what makes that 3 layer scrolling in Rondo.

Which parts are you thinking of? I don't think there's anything fancy in Rondo. I think some areas use scan line scrolling + dynamic tiles + sprites in a pretty convincing manner though.

[Sephirothkefka]

Oh sweet! Well now I need to figure out what makes that 3 layer scrolling in Rondo.

Which parts are you thinking of? I don't think there's anything fancy in Rondo. I think some areas use scan line scrolling + dynamic tiles + sprites in a pretty convincing manner though.

So developer tricks is what you are saying?

[Sadler]

Yeah. I mean, basically the same tricks used for parallax in every PCE game that features parallax. Other ways the PCE can do parallax include using the background color like the first level of Magical Chase (and I'm somewhat convinced the first level rainbows in Star Parodier), and maybe palette rotation. I don't know if palette rotation is used to simulate parallax in any PCE game.

Anyway, Rondo, while a very pretty game, is not doing anything that other PCE games don't do and it's not using any special hardware to do it.

[Sephirothkefka]

Yeah. I mean, basically the same tricks used for parallax in every PCE game that features parallax. Other ways the PCE can do parallax including using the background color like the first level of Magical Chase (and I'm somewhat convinced the first level rainbows in Star Parodier), and maybe palette rotation. I don't know if palette rotation is used to simulate parallax in any PCE game.

Anyway, Rondo, while a very pretty game, is not doing anything that other PCE games don't do and it's not using any special hardware to do it.

Ok, thanks! Thought it was that D91317 chip again

[ccovell]

http://forum.fobby.net/index.php?t=msg&goto=2088&

No info about the NEC chip, but it's likely just glue logic or port mapping hardware.

All the magic is in the PCE unit and the programmer's hands. ;-)

[Sephirothkefka]

http://forum.fobby.net/index.php?t=msg&goto=2088&

No info about the NEC chip, but it's likely just glue logic or port mapping hardware.

All the magic is in the PCE unit and the programmer's hands. ;-)

That website looks very familiar while I was researching about the info of the D91317GD...