Doom on z80

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Par erpirao

Paragon (1251)

Portrait de erpirao

30-10-2020, 20:16

Randam wrote:

And if you go gfx9000? would that improve playability?

The V9990 is much faster than the 9958, but I think the interesting thing is you know how far the msx2 (or in this case the turboR) goes

Par Randam

Paragon (1430)

Portrait de Randam

31-10-2020, 06:33

True and I am all for that, but if a v9990 makes it much more doable and actually results in a game I also would like that.

Par wouter_

Champion (481)

Portrait de wouter_

31-10-2020, 10:33

Randam wrote:

And if you go gfx9000? would that improve playability?

It's been a very long since I (helped) develop this code. But if I remember correctly the main bottleneck was not the VDP but the CPU (R800). So switching to gfx9000 won't help that much.

Par Manuel

Ascended (18744)

Portrait de Manuel

31-10-2020, 10:48

ARTRAG wrote:

It could go close enough to be playable
But it needs a lot of work to get a full game

I have the feeling ARTRAG is not talking about work on the rendering engine, but more work on content creation and details about the engine to make it a game (open doors, keys, health, weapons, etc.)

Par erpirao

Paragon (1251)

Portrait de erpirao

31-10-2020, 22:32

I just did a test with the webMSX, which allows speeding up the vdp or the cpu, and I have put the VDPx4 (1/2 that of the 9990), the minimum frames have risen to 17, and I have quite high maximums.

@Manuel,
you are very right and a proof is the doom they are doing for the amiga500.
doom amiga500

Par ARTRAG

Enlighted (6832)

Portrait de ARTRAG

01-11-2020, 09:46

In order to get a game from the current demo one should add doors, interaction with switches, sprite spawning and AI, interaction with sprites, weapons and bullets, level generation...

Par msd

Paragon (1472)

Portrait de msd

01-11-2020, 11:12

The CPU might be the biggest bottle neck, however there are less cycles wasted by waiting for the VDP when using the V9990. Also in cases you need less instruction due to simpler register setup of the v9990.

Par erpirao

Paragon (1251)

Portrait de erpirao

23-03-2021, 20:59

I just saw this for spectrum next: Wolfenstein 3d - spectrum next
it is very interesting.
in the end there is some test of a "wolfestein" in turboR + 9990?

Par Sandy Brand

Champion (277)

Portrait de Sandy Brand

24-03-2021, 01:10

Very impressive for sure Smile

But let's not forget that, although it is an 8-bit architecture, a 'Spectrum Next' is basically an FPGA emulated imaginary ZX Spectrum at 28 Mhz, 2048 KiB of memory and some new graphic modes?

I didn't see anything MSX related at the end of the video though?

Par Metalion

Paragon (1491)

Portrait de Metalion

24-03-2021, 10:48

Sandy Brand wrote:

But let's not forget that, although it is an 8-bit architecture, a 'Spectrum Next' is basically an FPGA emulated imaginary ZX Spectrum at 28 Mhz, 2048 KiB of memory and some new graphic modes?

With a lot of new Z80 instructions as well ...

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