Vampire Killer

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Por PingPong

Enlighted (4098)

Imagen del PingPong

24-12-2022, 18:34

on a pc xt tandy https://www.youtube.com/watch?v=9kq_6wSUmrA&t=1203s
Someone think a msx2 version could do a little better in terms of scrolling using the VDP?

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Por sd_snatcher

Prophet (3646)

Imagen del sd_snatcher

25-12-2022, 15:46

You mean, like these? Seems to already have been proven many times...

Por PingPong

Enlighted (4098)

Imagen del PingPong

25-12-2022, 17:04

sd_snatcher wrote:

You mean, like these? Seems to already have been proven many times...

No, i mean a more classical approach of brute force scrolling. In the video i've measured a 3 fps. The vdp should be able to do a little better.

Por gdx

Enlighted (6120)

Imagen del gdx

26-12-2022, 01:22

The VDP copy command is too slow to do this. We are forced to use the "SET ADJUST" to make a clean scroll.

Por syn

Prophet (2117)

Imagen del syn

26-12-2022, 01:56

PingPong wrote:

No, i mean a more classical approach of brute force scrolling. In the video i've measured a 3 fps. The vdp should be able to do a little better.

You mean something like Ys3?

Por sd_snatcher

Prophet (3646)

Imagen del sd_snatcher

26-12-2022, 02:48

I wonder why impose this requirement to scroll using the blitter, since it's more resource intensive and less efficient than a smooth scroll using the screen offset register (just like it's done on the C64, amongst others).

Por PingPong

Enlighted (4098)

Imagen del PingPong

26-12-2022, 10:07

gdx wrote:

The VDP copy command is too slow to do this. We are forced to use the "SET ADJUST" to make a clean scroll.

The vdp hmmc copy command can do 6-7 fps for a full screen scroll. The game as little less game area.
Judging by the tandy video the fps on pc are less than 6 fps

Por gdx

Enlighted (6120)

Imagen del gdx

26-12-2022, 12:07

That's what I'm saying, it's too slow. Look at the Ys series, it's not full screen but it's already too slow.

Por Metalion

Paragon (1622)

Imagen del Metalion

26-12-2022, 13:03

PingPong wrote:

on a pc xt tandy https://www.youtube.com/watch?v=9kq_6wSUmrA&t=1203s
Someone think a msx2 version could do a little better in terms of scrolling using the VDP?

Well of course, that's a simple 8 pixels character scroll.
Could be done simply on SCREEN4, and much more rapidly than on this Tandy machine.

PS: The test of Castlevania is rather at 1071s than 1203s.

Por PingPong

Enlighted (4098)

Imagen del PingPong

26-12-2022, 15:01

gdx wrote:

That's what I'm saying, it's too slow. Look at the Ys series, it's not full screen but it's already too slow.

i know the vdp is slow. but my question is another. can we get better performances even using the brute force scrolling approach on VDP with HMMM commands?
I've never measured tandy fps but i think we can get a bit more. Even if we considering what we have hw sprites and we are not not necessarily forced to move the entire screen

Por PingPong

Enlighted (4098)

Imagen del PingPong

26-12-2022, 15:02

Screen 4 is not the point, I mean screen 5. Since i talked about VDP commands

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