V9958 on an MTX

[Martin A]

Output from the V9958

after tweaking.jpg (93.99 KiB) Viewed 36660 times

MTX512 driving a V9958 video processor

Testing on the EB512.jpg (161.76 KiB) Viewed 36660 times

Minor success today, first output from the V9958 supplied by Lez, being driven by the much abused MTX500 I upgraded to 64k.

That's half the amount that's on the video board, and there are 2 sockets obscured by the daughterboard that could bump the video ram to 192k.

The visible empty socket is designed to take a sound chip, but that has yet to be tested.

[lezanderson]

AWESOME !!

[Dave]

Well done !

That looks like a really good design, wherever did you find it?

[1024MAK]

I think the answer to Dave's question is: down the back of a sofa?

Well done Martin.

Now does this mean we get a colour version of textinvaders?

Mark

[Martin A]

Now does this mean we get a colour version of textinvaders?

Mark

Hm I guess that depends on the market, what's your estimate of the number MTX's there are out there running with a V9958 expansion?


I was cheating a little to get the display set up, the 9958 was set to respond to ports 1 and 2, effectively shadowing the on-board VDP (which is driving the mono screen). However it does also demonstrate the backward compatibility Yamaha built in.

It does work using it's "normal" ports, but takes a lot of OUT 152 and 153's just to print "Ready" in text mode, getting a display complex enough to "tune" in the picture would have taken quite a while.

[Martin A]

Graphics mode 7

G7 Test-sm.jpg (88.24 KiB) Viewed 36626 times

Graphics mode 7 tested

It's a bitmapped 256 x 192 mode in 256 colours

I'm still running composite video output.

The very basic BASIC used to set up the display can be seen on the other screen.

[1024MAK]

Nice

Keep them updates coming

Mark

[Martin A]

Nothing new from the weekend, I got side-tracked putting together some 6309 based hardware.

I WILL get the 80 column text mode tested, I promise!

[Martin A]

Just for Claus:

Have a look at E

Magrom gets a new option

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I was experimenting with Graphic mode 7: I wanted to show something a litle more interesting that a colour chart.

As I'm using Magrom to load the image, I've had to keep within the 28k or so file size that the board limits me too.

The original image is 192 x 139 8 at 8 bits per pixel its just over 26k in size leaving enough room for the code.

It's scaled up to 192 x 208 to restore the aspect ratio.

A better "delivery system" would have allowed a full screen image, with a little more detail.

Still, it's not a bad indicator of the possibilities

It may be possible to rival the HRX?

Surprise!

output.jpg (84.96 KiB) Viewed 36580 times

[Dave]

So, what would you little maniacs like to do first?