VDU project

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By wolf_

Ambassador_ (9876)

wolf_'s picture

16-09-2007, 18:59

Here's the continuation of this newspost!

VDU is an MSX "videocard" made out of 4x 9958 chips, thus 4 multilayer scrolls of high-color screens, 4x sprites etc. etc.

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Enlighted (6506)

ARTRAG's picture

16-09-2007, 19:09

send me a vdu (for free) and i'll continue the debate :-)

By nikodr

Paladin (747)

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16-09-2007, 19:51

well if it could be made on large quantities (example like manuel pazos's megaflash or sunrise cf adapter of v9990 cards) then it should be ok,otherwise it is just an interesting experiment for me.

By SLotman

Paragon (1236)

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16-09-2007, 20:51

Well, it can be made. I recently found a vendor with several v9990 - they probably should have some v9958 too.

The rest, as far as I know are implemented in FPGA, so it shouldnt be hard to make. Problem is the cost, besides the FPGA board, 3 v9958 wouldnt be something very cheap...

Oazem just made it "for the fun", but I bet if enough people show interest on this, he would make them... for now he is still thinking on what to do to make it even better (like adding more memory for at least one vdp, and/or making vdp access faster)

Another thing I just thought, this could be used to improve the EVA player -- since it uses the VRAM as a buffer, and with VDU we have 4x 128kb...

SymbOS maybe could benefit from it... imagine a wallpaper on SCR12 not interfering with anything else in the OS!

Hmmm... not even re-programming needed, just load a SCR12 image on VDP1, set VDP0 to be written to, and put a wallpaper on SymbOS with color 0,0,0 all over... and it's done :)

By Manuel

Ascended (17947)

Manuel's picture

16-09-2007, 20:59

But ehm, if you're combining VDP's anyway, why not combine V9958 with V9990? That's also lots of power. In principle, the V9990 can be superimposed with the V9958.

By SLotman

Paragon (1236)

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16-09-2007, 21:05

Oazem is thinking about it... but first he has to get a V9990 to start experimenting Smile

By Prodatron

Paragon (1789)

Prodatron's picture

16-09-2007, 21:43

@Slotman: *EDIT* Cool chip search page, didn't know it before. I am interested in that, too.
In general wouldn't it be possible to build the 9958 or 9990 in current not too expensive FPGA chips?

By RobertVroemisse

Paragon (1298)

RobertVroemisse's picture

16-09-2007, 23:00

Okay, sounds cool but...

What will the price be? Don't need exact prices (yet), but are we talking 100 or 300 euro's for example?


Enlighted (6506)

ARTRAG's picture

16-09-2007, 23:47


IMHO the price for bulks of 8-10chips should be c.a. 16$/chip

By Edwin

Paragon (1182)

Edwin's picture

16-09-2007, 23:55

I don't think relying on an FPGA would be good for the price. Maybe a small CPLD for some control logic or something. But even for those there are probably cheaper solutions.

By ivke2006

Resident (53)

ivke2006's picture

17-09-2007, 13:13

hmm..implementing this in the OCM should not be that hard I gues...If enough gates are available on the FPGA. :-)

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