vga, xvga, svga

kelli217 · Post by **kelli217** » Mon Feb 22, 2021 10:23 am

1 hour ago, Cyber said:

I think you are missing the point and project goal.

I said unreasonable.

kelli217 · Post by **kelli217** » Mon Feb 22, 2021 10:31 am

20 minutes ago, BruceMcF said:

It's about more than price point. It's an 8bit system with an 8bit processor driving an 8bit data bus. What would be the point of 24bit color support,for 1280x1024? How effectively could the 65c02 support it?

640x480 has a very real point: it allows 80 column text mode. Once that is hit (as some if not all 8bit systems did), the question becomes WHY raise the cost of the system with the next tier up FPGA in both number of available slices and available built in SRAM?

There's always "more" to be hit in terms of resolution, which is why they are now pushing consumers to "upgrade" to 4K TVs. To paraphrase Jurassic Park, "your computer scientists were so busy trying to find out how to do it, they forgot to ask WHETHER they should do it."

Right.

I was merely adding yet anooooother reason why not.

It wasn't intended to be 'the only valid reason.'

Cyber · Post by **Cyber** » Mon Feb 22, 2021 11:03 am

38 minutes ago, kelli217 said:

I said unreasonable.

I'm sorry. I was the one who missed your point. You are right. )

desertfish · Post by **desertfish** » Mon Feb 22, 2021 11:17 am

Also isn't it more fun to work with the constraints we have now!

Instead of having a 16 or even 32 bit true color screenmode we could try to do something like FLI on the C64 where a bitmap image was showing MORE colors by changing the palette every X scanlines or interpolating 2 colors in interlaced frames.... This kind of trickery is for me a big part of the charm of the original 8 bit systems. Push them to the limits and beyond normal expected results by using interesting new tricks. I wonder what we can do with the Vera ?‍♂️

codewar65 · Post by **codewar65** » Mon Feb 22, 2021 3:13 pm

640x480 is about all the VRAM on VERA can handle; and about what a 65x02 @ 8MHz can handle populating the VRAM in a timely manner.

Robinkle · Post by **Robinkle** » Mon Feb 22, 2021 10:05 pm

640x360 would be pixel perfect with HD, 1440p and 4K displays. I would like to know if this was considered. It makes sense mathematically at least.

BruceMcF · Post by **BruceMcF** » Tue Feb 23, 2021 3:37 am

5 hours ago, Robinkle said:

640x360 would be pixel perfect with HD, 1440p and 4K displays. I would like to know if this was considered. It makes sense mathematically at least.

The design target was to run on original VGA, and original VGA was a 4:3 ratio display, not a 16:9 ratio display. Indeed, that was a secondary strike against the original FPGA video chip design, though the primary strikes were device contention between 6502 bus access and the J1 coprocessor and the lack of a true bitmap mode.

Indeed, you can easily do a 640x360 display by just setting black bars at the top and bottom, and if shown on a TV with all the display options, it would fit. And 640x480 is pixel perfect on a 1440p display if you adjust the display width correctly.

TomXP411 · Post by **TomXP411** » Tue Feb 23, 2021 9:22 am

11 hours ago, Robinkle said:

640x360 would be pixel perfect with HD, 1440p and 4K displays. I would like to know if this was considered. It makes sense mathematically at least.

There is no such mode in the VGA specification. So no, I doubt they considered a resolution that does not exist.

OguzhanKuyubasi · Post by **OguzhanKuyubasi** » Thu Feb 25, 2021 8:20 pm

On 2/22/2021 at 4:13 PM, codewar65 said:

640x480 is about all the VRAM on VERA can handle; and about what a 65x02 @ 8MHz can handle populating the VRAM in a timely manner.

This Resolution and the Palette that the VERA is offering is more than enough for an 8-Bit Computer and it's more powerful than a TG16/PCE.

I'm not from the C64 nor DOS era. I'm more from the Windows XP and Windows 7 era and I was 5 years old (that was in the Year 2008) who I am used a Laptop (a Acer Aspire One A110).?

Nobody asks me but I want to tell it.?

TomXP411 · Post by **TomXP411** » Thu Feb 25, 2021 10:51 pm

On 2/22/2021 at 7:13 AM, codewar65 said:

640x480 is about all the VRAM on VERA can handle; and about what a 65x02 @ 8MHz can handle populating the VRAM in a timely manner.

Just a note: the preferred group term for the 6502 and its descendants is "65x".

That would not only cover the MOS designs (6502, 65C02, 65816, etc) but the variants made for Commodore (6510, 8502), Atari (6507), and NES (Ricoh 2A03 - which adds sound and game controller polling, but removed the BCD mode).

So like we say "x86" to mean everything from the 8088 to the Intel Core i12, "65x" means "everything with a 6502 instruction set."