Common Emulator Development Issues - Revision history

MSaarna at 19:14, 24 February 2025

2025-02-24T19:14:24Z

MSaarna at 12:09, 9 May 2024

2024-05-09T12:09:58Z

MSaarna at 01:34, 21 January 2024

2024-01-21T01:34:54Z

MSaarna at 01:23, 21 January 2024

2024-01-21T01:23:33Z

MSaarna at 01:12, 21 January 2024

2024-01-21T01:12:01Z

MSaarna at 01:07, 21 January 2024

2024-01-21T01:07:42Z

Trebor: /* ROMs That May Be Reported As Bugs, But Aren't */

2023-06-03T00:44:46Z

‎ROMs That May Be Reported As Bugs, But Aren't

Trebor: /* ROMs That May Be Reported As Bugs, But Aren't */

2023-06-02T01:08:50Z

‎ROMs That May Be Reported As Bugs, But Aren't

Trebor: /* ROMs That May Be Reported As Bugs, But Aren't */

2023-06-02T00:37:36Z

‎ROMs That May Be Reported As Bugs, But Aren't

Trebor: /* ROMs That May Be Reported As Bugs, But Aren't */

2023-06-02T00:25:20Z

‎ROMs That May Be Reported As Bugs, But Aren't

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 * Xenophobe. If the bottom row of the titlescreen graphic is the incorrect color, it means that DMA cycle penalties or timing aren't accurate.
 * Xenophobe. If all of the main action screen glitches periodically, it means that DMA cycle penalties or timing aren't accurate.
-* Ninja Golf. If the player number selection screen has squished graphics (displaying 160A graphics at 160B) then you need to account for non-zero DLL terminators. Maria ignores bits 7 and 5, so your terminator check should be for "!(value & 0x5F)".
+* Ninja Golf. If the player number selection screen has squished graphics (displaying 160A graphics at 160B) then you need to account for non-zero DL terminators. Maria ignores bits 7 and 5, so your terminator check should be for "!(value & 0x5F)".
-* Crossbow. If all graphics appear garbled/in wrong mode then you need to account for non-zero DLL terminators. Maria ignores bits 7 and 5, so your terminator check should be for "!(value & 0x5F)".
+* Crossbow. If all graphics appear garbled/in wrong mode then you need to account for non-zero DL terminators. Maria ignores bits 7 and 5, so your terminator check should be for "!(value & 0x5F)".
 * Planet Smashers. If the background starfield is replaced by glitched graphics, you aren't checking the entire 8000-BFFF range for the bankswitch hotspot. This game uses the BFFF hotspot.
 * Alien Brigade. Corruption in the main screen can be caused by missing or incorrect DMA cycle penalties, whenever lots of objects are displayed in this game.

← Older revision		Revision as of 12:09, 9 May 2024
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	* Klax. If the game starts up with black screen. you might need to change where the emulator starts in the screen, similar to Pole Position II. The Klax proto has a race condition, and has hit-or-miss startup on (some) real consoles too.		* Klax. If the game starts up with black screen. you might need to change where the emulator starts in the screen, similar to Pole Position II. The Klax proto has a race condition, and has hit-or-miss startup on (some) real consoles too.
	* Tower Toppler. If graphics are striped and ugly, it's due to missing composite video effects. On a composite video display, pixels that alternate intensity at 320 resolution should appear as a continuous area of "artifacting" color.		* Tower Toppler. If graphics are striped and ugly, it's due to missing composite video effects. On a composite video display, pixels that alternate intensity at 320 resolution should appear as a continuous area of "artifacting" color.
		+	* Legend of Silverpeak. (homebrew) If the game crashes, you need to bankswitch to bank 0 prior to starting emulation.
		+	* E.X.O. (homebrew) If some musical notes are silent or off-key, the pokey emulation needs cycle-accurate emulation of 16-bit joined channels, 1.79Mhz audio channels, two-tone, and "low pass" filtering. See the pokey section of [https://www.virtualdub.org/downloads/Altirra%20Hardware%20Reference%20Manual.pdf The Altirra Hardware Reference Manual]. Accurate pokey emulations, for reference source, include Altirra (original), MAME/A7800 (original), JS7800 (prosystem derived).
		+	* A.R.T.I. (homebrew) If some musical notes are silent or off-key, the pokey emulation needs cycle-accurate emulation of 16-bit joined channels, 1.79Mhz audio channels, two-tone, and "low pass" filtering. See the pokey section of [https://www.virtualdub.org/downloads/Altirra%20Hardware%20Reference%20Manual.pdf The Altirra Hardware Reference Manual]. Accurate pokey emulations, for reference source, include Altirra (original), MAME/A7800 (original), JS7800 (prosystem derived).

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 * Karateka. If during the second enemy stage, there is flickering in the bottom right area and/or the power meter, it means that DMA cycle penalties or timing aren't accurate.
 * BallBlazer. If the music track is missing a voice, it's likely the Pokey random number generation is missing or broken.
-* Pole Position. If the track selection by joystick only allows selection between tracks 2 and 4, it's due to a race condition that is won on a real console. Starting the emulation at vblank, instead of the top of the visible screen, should allow track selection to work correctly.
+* Pole Position II. If the track selection by joystick only allows selection between tracks 2 and 4, it's due to a race condition that is won on a real console. Starting the emulation at vblank, instead of the top of the visible screen, should allow track selection to work correctly.
 * Tower Toppler. If graphics are striped and ugly, it's due to missing composite video effects. On a composite video display, pixels that alternate intensity at 320 resolution should appear as a continuous area of "artifacting" color.

← Older revision		Revision as of 01:23, 21 January 2024
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	* BallBlazer. If the music track is missing a voice, it's likely the Pokey random number generation is missing or broken.		* BallBlazer. If the music track is missing a voice, it's likely the Pokey random number generation is missing or broken.
	* Pole Position. If the track selection by joystick only allows selection between tracks 2 and 4, it's due to a race condition that is won on a real console. Starting the emulation at vblank, instead of the top of the visible screen, should allow track selection to work correctly.		* Pole Position. If the track selection by joystick only allows selection between tracks 2 and 4, it's due to a race condition that is won on a real console. Starting the emulation at vblank, instead of the top of the visible screen, should allow track selection to work correctly.
		+	* Tower Toppler. If graphics are striped and ugly, it's due to missing composite video effects. On a composite video display, pixels that alternate intensity at 320 resolution should appear as a continuous area of "artifacting" color.

← Older revision		Revision as of 01:12, 21 January 2024
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	* Karateka. If during the second enemy stage, there is flickering in the bottom right area and/or the power meter, it means that DMA cycle penalties or timing aren't accurate.		* Karateka. If during the second enemy stage, there is flickering in the bottom right area and/or the power meter, it means that DMA cycle penalties or timing aren't accurate.
	* BallBlazer. If the music track is missing a voice, it's likely the Pokey random number generation is missing or broken.		* BallBlazer. If the music track is missing a voice, it's likely the Pokey random number generation is missing or broken.
		+	* Pole Position. If the track selection by joystick only allows selection between tracks 2 and 4, it's due to a race condition that is won on a real console. Starting the emulation at vblank, instead of the top of the visible screen, should allow track selection to work correctly.

← Older revision		Revision as of 01:07, 21 January 2024
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	* Ace Of Aces. If the top line of sky bounces around, it means that DMA cycle penalties or timing aren't accurate.		* Ace Of Aces. If the top line of sky bounces around, it means that DMA cycle penalties or timing aren't accurate.
	* Karateka. If during the second enemy stage, there is flickering in the bottom right area and/or the power meter, it means that DMA cycle penalties or timing aren't accurate.		* Karateka. If during the second enemy stage, there is flickering in the bottom right area and/or the power meter, it means that DMA cycle penalties or timing aren't accurate.
		+	* BallBlazer. If the music track is missing a voice, it's likely the Pokey random number generation is missing or broken.

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 * Rikki & Vikki.  Sound effects volume too low or too high.  Difficulty switch settings control TIA (Sound effects) amplitude.
 * Crazy Brix.  Controls not responding, can't start a game, or game freeze.  Check difficulty switches, tells game what controller types to expect.
-* Armor Attack II.  Second button does not accelerate vehicle.  Difficulty switch setting toggle between pressing UP on joystick or Button 2 to accelerate.
+* Armor Attack II.  Second button does not accelerate vehicle.  Difficulty switch setting toggle between pressing Up on joystick or Button 2 to accelerate.
 * Galaxian.  Player's ship fires too fast or too slow.  Shot speed determined by difficulty switches.
 * Plutos.  Always starts a 2 Player game.  Difficulty switch settings determine whether 1 Player or 2 Players simultaneous game.

← Older revision		Revision as of 00:37, 2 June 2023
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	* Ikari Warriors. No background music. Music presence set by difficulty switches.		* Ikari Warriors. No background music. Music presence set by difficulty switches.
	* Missing In Action. Keeps rotating through start of level or player invincible. Invincibility, taking damage, and level select are determined by difficulty switch settings.		* Missing In Action. Keeps rotating through start of level or player invincible. Invincibility, taking damage, and level select are determined by difficulty switch settings.
		+	* Bentley Bear's Crystal Quest. Doesn't jump or walks too slow, can't run. Check difficulty switch settings. Set the Left Switch to the right & set the Right Switch to the left.
		+	* Rikki & Vikki. Sound Effects volume too low or too high. Difficulty switch settings control TIA (Sound Effects) amplitude.
		+	* Crazy Brix. Controls not responding, can't start a game, or game freeze. Check difficulty switches, tells game what controller types to expect.
		+	* Armor Attack II. Second button does not accelerate vehicle. Difficulty switch setting toggle between pressing UP on joystick or Button 2 to accelerate.
		+	* Galaxian. Player's ship fires too fast or too slow. Shot speed determined by difficulty switches.
		+	* Plutos. Always starts a 2 Player game. Difficulty switch settings determine whether 1 Player or 2 Players simultaneous game.

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 * Super Skateboardin'.  Missing background melody.  Toggles via difficulty switches.
 * Ikari Warriors.  No background music.  Music presence set by difficulty switches.
-* Missing In Action.  Keeps rotating through start of level or player invincible.  Invincibility, taking damage, and level select are impacted, determined by difficulty switch settings.
+* Missing In Action.  Keeps rotating through start of level or player invincible.  Invincibility, taking damage, and level select are determined by difficulty switch settings.