S0.nes & NMI's

Muchaserres · Post by **Muchaserres** » Fri Apr 27, 2007 7:07 pm

Hi all,

While running this demo on the real thing, is the black area on SP0 hits be constant or does it flicker?

I've observed that if I remove all $2002 read trickery (necessary to pass blargg's tests), it flickers no more..

Thx.

Muchaserres · Post by **Muchaserres** » Wed Aug 08, 2007 2:44 pm

Under my emu conditions, the program seems to read VBL flag just one PPU clock before it being set, causing the setting itself being supressed.

Now, if I remove this supression, the "black bar" on sp0 hits flickers no more, but that obviously makes my emu to fail blargg's "2.vbl_timing
" test. Nestopia, on its side, passes every test, and still shows no flicker while running s0.nes.

Any clues?

Thx.

Post by **tepples** » Wed Aug 08, 2007 3:12 pm

Was it my sprite 0 tester? I wrote that before much was known about the NES PPU.

Muchaserres · Post by **Muchaserres** » Wed Aug 08, 2007 4:12 pm

It is the one by Damian Yerrick, "Sprite 0 Test", back to 2000. Did you write it? The point is that I dunno how it is expected to behave on the real deal.

Post by **tepples** » Wed Aug 08, 2007 4:49 pm

I am Damian Yerrick.

And neither do I know how it works on an NES. All I had back then were NESticle, LoopyNES, and NESten.

Muchaserres · Post by **Muchaserres** » Thu Aug 09, 2007 7:23 am

Nice to meet you!

And thanks for the info.

M.

Jedi QuestMaster · Post by **Jedi QuestMaster** » Thu Aug 09, 2007 4:37 pm

tepples wrote:I am Damian Yerrick.

I never knew that.

I like your NSF covers.