Dual TV Output

Publison

I'm trying to output Chip's Graphic demo to two separate outputs on the same Prop Prototype Board.

Resistors in place output verified by running the demo with the correct pin group individually.


OUTPUT TV1 = PINS 0..3
OUTPUT TV2 =PINS 16..19

Can it be done?

Duane Degn

Are both TVs going to have identical graphics? If not, I think you'll have memory problems. IIRC, the graphics demo uses a lot of RAM.

kwinn

If you are not doing identical graphics I agree with what Duane posted. If you want the same image on 2 monitors why not put another set of resistors on the video output pins. The prop should not have any trouble driving them.

JRetSapDoog

For different content on each screen, it would probably work if the driver were modified to halve the resolution and thus use less memory. Tile mapped drivers could work. It definitely works for the TV text drivers (like Chip's with 40 chars x 13 lines). You just need to create two instances (2 separate variables (preferably use an array)) of the text driver from the main program in the OBJ section and call start on both of them, sending in different base pin numbers (such as 0 and 4, or perhaps 16 and 20 or similar). That will result in creating one TV cog for one display, another TV cog for the other display, each with separte display memory areas. Perhaps if you get some experience with using multiple instances of the TV text driver, it will give you some insights for more demanding situations, though it won't solve memory issues for the higher res bit-mapped scenario.

Publison

Thanks for the replies guys. I thought memory was going to be a problem.

They are two separate graphics programs, two displays showing some gauges and numbers. It doesn't do much except animate the panel a little.

I'll just slap another Prop on the board and split up the displays.