Glitches and emulation errors in Mega Drive, Retrocopy 0.720

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Posted by Sasha on Wednesday, March 17, 2010

Sasha

Type: Member
Posts: 185
Joined: 2/19/2010

Retrocopy 0.720

Still some bugs with Sonic the Hedgehog 3, colors dots in water:

in Sonic 3D blast main menu colors too juiced and dark

i found megadrive approximately volume of PSG 1.000000, noise levels must be decreased at 3-5%

filter: cut off - causes random clicks.

sound may desync and produce random clicks and crackles.

Now i must continue test's

game "4 in 1" still can't work properly, works only Robocop 3.

Gargoyles - not playable, character still die in the black screen.

Thunder force 4 - not run at all, just show black screen.

Valis - not run at all, just show black screen.

Valis 3 - not run at all, just show black screen.

Squirel king - collision bug, character still fall and lost lives + new graphic glitch with main screen:

Beyon of Oasis - still hang and cause Retrocopy 0.720 crash!

Mega-lo-Mania - graphic glitch, messed textures of trees:

http://radikal.ru/F/i059.radikal.ru/1002/2d/221a4f07383d.jpg.html

Mickey Mania still have glitches at the right side of screen:

Sonic the Hedgehog 2: still have strange scanlines in two players mode with split-screen:

Bonkers - graphic glitches, all textures distorted:

SuperSkidmarks - menu glitch, screen completely messed:

Sesame Street counting cafe - not work at all, just show black screen.

Wolf Child - On title screen name of game with wrong draw:

Mr Nuts - not run at all, just show black screen.

Super Fantasy Zone - not run at all, just show black screen.

Zoop - no playable, because i can't see items.

Risky Woods - all enemyes and items invisible.

Evander Holyfiel Boxing - box without boxers.

Killing game show - cause crash Retrocopy 0.720 with error messages!

NHL 98 after main menus show black screen.

Best of the Best championship karate - in pause mode, graphic glitches:

Phantom 2040 - lines of health and ammo with bugs:

Thunder force 4 - not run at all, just show black screen.

Soul Blade (unl) - when fight begin, crash Retrocopy 0.720!

Eternal Champions - graphic bug with health lines and timer, all graphic is broken.

Edited 18 times. Last edit by Sasha

Posted by Neville on Wednesday, March 17, 2010

Neville

Type: Member
Posts: 41
Joined: 12/13/2009

On the other hand, now "Lotus" and "Outrun"'s problems seem gone:

But "Risky Woods" still won't show the graphics for weapons or enemies.

Posted by Sasha on Wednesday, March 17, 2010

Sasha

Type: Member
Posts: 185
Joined: 2/19/2010

Neville wrote:

But "Risky Woods" still won't show the graphics for weapons or enemies.

Yeah, and + Soul Blade (unl), Killing game show, Beyon of Oasis - these games crash with error messages.

I spend just 57 minutes for searching big list of known games with bugs, and i must check all 500 games for any minor bugs.

I found new bugs:

Addams family values - vertical color dots at right side of screen:

Aero the Acrobat 2 - horizontal white and grey dots:

http://s57.radikal.ru/i155/1003/c2/590d8a701f5c.png

Awesome Possum - new bug with controller, strange button A and C works not properly, button C work as pause?

Beast Wrestler - not run at all, just show black screen.

Bio-Hazard Battle - new bug with controller, strange button A and C works not properly, button C work as pause?

Brett Hull Hockey '95 - all players invisible

Bugs life (unl) - not run at all, just show black screen.

Chester Cheetah - this new strange graphic bug:

Edited 12 times. Last edit by Sasha

Posted by RetroRalph on Thursday, March 18, 2010

RetroRalph

Type: Administrator
Posts: 801
Joined: 7/19/2009

Sasha wrote:

filter: cut off - causes random clicks.

sound may desync and produce random clicks and crackles.

Likely means you don't have enough performance to enable it. Press F2 to check for "repos" that means sound can't keep up if you get them constantly. I struggled enabling all the options in some instances.

Sasha wrote:

Sonic the Hedgehog 2: still have strange scanlines:

You mean accurate scanlines?

Yeah I need to make a progressive mode for that don't I, no one likes the interlaced emulation.

Posted by Sasha on Thursday, March 18, 2010

Sasha

Type: Member
Posts: 185
Joined: 2/19/2010

RetroRalph wrote:

You mean accurate scanlines?

Yeah I need to make a progressive mode for that don't I, no one likes the interlaced emulation.

Yes i think what screen filled scanlines it's bug, because on my real thing + all another emulators i never see these scanlines

RetroRalph wrote:

Sound repos=1 and sound skips 3 - this is good result?

Maybe very high frequences cause clicks when Sonic do harsh attack or collect rings, it cause crackles and clicks.

You may test this issue on game: populous 1 - sounds as heart beat with crackle

Dune the battle for arrakis - new graphic bug:

F1 circus md - after game menu, Retrocopy 0.720 crash with error message!

F-117 night storm - not run at all, just show black screen.

Fatman - not run at all, just show black screen.

Gaiares - not run at all, just show black screen.

Gain ground - still won't show characters in game land.

Garfield - caught in the act: all graphic still distorted.

Home Alone 2 - all graphic distorted:

Klax - bug with controller, strange button A and C works not properly, button C work as pause?

lhx attack chopper - not run at all, just show black screen.

Marvel land - color dots on the sky.

Misadventures of flink - some screens with these distortions:

Mulan(unl) - after intros, game show black screen.

Nba JAM tournament - just these color stripes:

Nhl 94 - Retrocopy 0.720 crash with error message!

Nhl 95 - Retrocopy 0.720 crash with error message!

Slaughter sport - not run at all, just show black screen.

Soldiers of fortune - trees messed:

Spider-man vs the kingpin - Spiderman run too fast

Street racer - glitch with Press Start and color dots at horizont:

Sub terrania - screens with graphic distortions:

Taz-Mania - run too fast

Virtua Fighter 2 - in upper left side of screen graphic glitch:

Virtual Pinball - graphic messed in some areas:

Edited 40 times. Last edit by Sasha

Posted by Eke-Eke on Thursday, March 18, 2010

Eke-Eke

Type: Member
Posts: 18
Joined: 3/5/2010

RetroRalph wrote:

Yeah I need to make a progressive mode for that don't I, no one likes the interlaced emulation.

Actually, accurate interlaced emulation need an interlaced display or this will look like shit. There is no point in doing this on CRT since it will not be accurately rendered by the Video Hardware anyway. Also, there are no "scanline" in interlaced video, "scanline" is a side effect of lowres non-interlaced display (aka 240p). Those lines are not visible on real hardware, there is indeed some screen tearing because odd/even lines are flickering at 60hz but that's all, it's nothing near like that.

Edited 1 times. Last edit by Eke-Eke

Posted by Sasha on Thursday, March 18, 2010

Sasha

Type: Member
Posts: 185
Joined: 2/19/2010

I completed tests of all 500 games, tired and very happy

Posted by RetroRalph on Thursday, March 18, 2010

RetroRalph

Type: Administrator
Posts: 801
Joined: 7/19/2009

Eke-Eke wrote:

Mmm well it can be somewhat accurately rendered on our displays. When a line is rendered on CRT it begins to fade so it does begin to look darker and darker until the TV comes back to "redraw it". Since one field is drawn first then the next you can notice the scanline effect on some CRT with interlaced content. RetroCopy doesn't emulate this fade so it looks quite different (and wrong).

If you put an old CRT PC monitor at 60Hz you can notice this fade/flicker and it updates 60 times per second the whole frame, so if you imagine it at 30Hz for half the lines you could predict how it would be roughly.

If CRT interlaced display could keep the fields steady and simply have the combing you talk about not many people would be complaining about headaches/eye strain and whatnot when viewing it.

Posted by Sasha on Thursday, March 18, 2010

Sasha

Type: Member
Posts: 185
Joined: 2/19/2010

And after all testings adjustings, i tryed set PSG to 1.000000, Bass boost = 0, Mid Boost = -4, High Boost = -79, and run Sonic & Knuckles again, and like a blade by brains, in memory flash 15 seconds music from past time, and i scream it my real Mega Drive 2! So PSG in compare with all YM2612 channels + TV aspects with muffled sound

Added:

I have idea, for another audio systems, we may increase High Boost from -79 for example to -60 and check the game Sonic & Knuckles, rings must sounds at volume of music, yes rings may a bit louder at 3-5% and if we do right setup, and it will sounds as real Mega Drive 2

I still have issue with game - Crusader of Centy, text messages messed + inner save game not work.

Phantasy Star 2 - inner save game not work (SRAM)

Phantasy Star 3 - inner save game not work (SRAM)

So after testing various games with SRAM battery, i 100% sure Beyond of Oasis, NHL all series, and many sport simulators, causes crashes Retrocopy with error messages, because SRAM not implemented, they require SRAM battery for proper work.

Very required SRAM support, please

Edited 7 times. Last edit by Sasha

Posted by Sasha on Friday, March 19, 2010

#10

Sasha

Type: Member
Posts: 185
Joined: 2/19/2010

Bram stoker's dracula - after intro and option just hang, not playable yet.

And about fullscreen mode: i use resolution 1280x960 and Monitor still use 1280x1024, and i got small black borders.

And yes, Skitchin still have single line glitch...

Hopefully i found all bugs, and found another method of post pictures

Edited 2 times. Last edit by Sasha

Posted by RetroRalph on Friday, March 19, 2010

#11

RetroRalph

Type: Administrator
Posts: 801
Joined: 7/19/2009

Thanks for doing the pictures like that, looks neat!

SRAM support should be working, maybe some ROMs aren't being correctly detected or have bad headers. I'll have a look into it, but I tested with Shining Force 2 and it appeared to work.

Posted by Sasha on Friday, March 19, 2010

#12

Sasha

Type: Member
Posts: 185
Joined: 2/19/2010

RetroRalph wrote:

Thanks for doing the pictures like that, looks neat!

SRAM support should be working, maybe some ROMs aren't being correctly detected or have bad headers. I'll have a look into it, but I tested with Shining Force 2 and it appeared to work.

I use ROMs passed test of GoodGen v3, Kega Fusion not show any warnings with bad checksums, Kega and Regen works perfectly with my ROM's

After testing NHL games, Retrocopy crashes with error messages before show SEGA logo

Sorry it only on russian language, this is all crashes Retrocopy

P.S i tested all games in non-stop 39 hours

Edited 2 times. Last edit by Sasha

Posted by RetroRalph on Friday, March 19, 2010

#13

RetroRalph

Type: Administrator
Posts: 801
Joined: 7/19/2009

Good ROMs can still have "bad headers", it just means the developers didn't correctly set the header. It wasn't really a requirement for the game to work on the real system to set header correctly. Most emulators seem to hardcode things for certain games to overcome these issues.

Posted by Sasha on Friday, March 19, 2010

#14

Sasha

Type: Member
Posts: 185
Joined: 2/19/2010

RetroRalph wrote:

And why Beyond of Oasis crashes? i search all sources and download all versions of this game, but she still not work in Retrocopy.

Some games at start up try get access to SRAM, and if SRAM in emulator can't recognize game, emulator crashes with error message, i know about these issues, because i make bug reports for AamirM, currently Regen can't detect only 3-4 games with SRAM

Edited 1 times. Last edit by Sasha

Posted by RetroRalph on Friday, March 19, 2010

#15

RetroRalph

Type: Administrator
Posts: 801
Joined: 7/19/2009

Because I haven't hardcoded as many "fixes" for games so it's quite likely a few games crash on startup that should have SRAM set. It's just a theory anyhow, I'm not certain why it's crashing.

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