Rom Hunter Posted April 1, 2022 Share Posted April 1, 2022 No April Fools. Enjoy: http://www.atarimania.com/rom_collection_archive_atari_2600_roms.html Rom 8 10 Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted April 2, 2022 Share Posted April 2, 2022 Attached is the CloneSpy result of the V17 collection. Clones_1977_1992_V17.ods 2 2 Quote Link to comment Share on other sites More sharing options...
+Mitch Posted April 2, 2022 Share Posted April 2, 2022 I didn't see this one in there. Mitch alphabeam2600proto5-5.zip 1 1 Quote Link to comment Share on other sites More sharing options...
Ballblaɀer Posted April 2, 2022 Share Posted April 2, 2022 Just like I created for V16, here's a WinMerge report showing what's new/changed in V17. Reminder: something may be listed because the filename was changed/updated, rather than it being an entirely new ROM. This is intended to be an overview only. compare-v16-v17.htm 3 1 Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted April 2, 2022 Share Posted April 2, 2022 Thanks for providing the diffs, these are really helpful. 1 Quote Link to comment Share on other sites More sharing options...
Rom Hunter Posted April 3, 2022 Author Share Posted April 3, 2022 18 hours ago, Mitch said: I didn't see this one in there. Mitch alphabeam2600proto5-5.zip 5.72 kB · 8 downloads Thanks! Where did you get this one? Must have missed it. It's added to V18. Quote Link to comment Share on other sites More sharing options...
+Mitch Posted April 3, 2022 Share Posted April 3, 2022 I own the proto, I thought I posted it last year. Mitch 1 1 Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted April 3, 2022 Share Posted April 3, 2022 It helps filling the gap between the 1st proto and the final NTSC version. 3 Quote Link to comment Share on other sites More sharing options...
+Mitch Posted April 3, 2022 Share Posted April 3, 2022 It looks like I only posted it in the 7800 forum previously because I got it in a batch of 7800 protos. That is probably why you missed it. It seems like Tempest found it: http://www.atariprotos.com/2600/software/alphabeam/5583.htm Mitch 1 Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted April 10, 2022 Share Posted April 10, 2022 (edited) @Rom Hunter Have you seen this thread? The first attachment contains number of Dactari games. Since you already have some in your collection, I figured you might want to complete the list. I have attached the interesting ones. Odin_ROMs.zip Edited April 10, 2022 by Thomas Jentzsch 2 1 Quote Link to comment Share on other sites More sharing options...
Rom Hunter Posted April 10, 2022 Author Share Posted April 10, 2022 5 hours ago, Thomas Jentzsch said: @Rom Hunter Have you seen this thread? The first attachment contains number of Dactari games. Since you already have some in your collection, I figured you might want to complete the list. I have attached the interesting ones. Odin_ROMs.zip 15.46 kB · 4 downloads I think I missed this. I will examine these ROMs and the others from that topic. Thanks for letting me know, Thomas! 2 Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted April 11, 2022 Share Posted April 11, 2022 Another one for you. This time from Argentina (Edu Juegos). edugames.zip 1 Quote Link to comment Share on other sites More sharing options...
Rom Hunter Posted April 12, 2022 Author Share Posted April 12, 2022 Added. Thanks! Quote Link to comment Share on other sites More sharing options...
alex_79 Posted April 12, 2022 Share Posted April 12, 2022 12 hours ago, Thomas Jentzsch said: Another one for you. This time from Argentina (Edu Juegos). edugames.zip 49.09 kB · 4 downloads Argentina used the PAL-N TV system, which is 50Hz like European PAL but with some differences in the color signal. Atari 2600 consoles were available in this format, but I haven't found tech info about those, only a few pictures here (Note the "PAL-N" or "PN" printed on the labels). Most of the games above are converted from the NTSC version and retain the NTSC colors. So I wonder what palette the PAL-N console uses. Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted April 12, 2022 Share Posted April 12, 2022 (edited) 17 minutes ago, alex_79 said: So I wonder what palette the PAL-N console uses. I wondered about that too. Also, how odd scanlines looked on their TVs. Since they are using PAL, these games should display without colors. Edu Juegos' River Raid has 313 scanlines. Edited April 12, 2022 by Thomas Jentzsch Quote Link to comment Share on other sites More sharing options...
alex_79 Posted April 12, 2022 Share Posted April 12, 2022 Maybe the console is based on the NTSC TIA with an external transceiver circuit, like for Brazilian PAL-M 2600s. The PAL color loss is strictly related to how the PAL TIA encodes the signal. E.g. the PAL MARIA chip in the 7800 console outputs 313 scanlines and there's no color loss there. Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted April 12, 2022 Share Posted April 12, 2022 1 minute ago, alex_79 said: Maybe the console is based on the NTSC TIA with an external transceiver circuit, like for Brazilian PAL-M 2600s. The PAL color loss is strictly related to how the PAL TIA encodes the signal. E.g. the PAL MARIA chip in the 7800 console outputs 313 scanlines and there's no color loss there. Interesting. Can you explain why that works? I thought two consecutive frames are used to "average" the colors. Quote Link to comment Share on other sites More sharing options...
alex_79 Posted April 12, 2022 Share Posted April 12, 2022 3 minutes ago, Thomas Jentzsch said: Can you explain why that works? I thought two consecutive frames are used to "average" the colors. No, I don't know how this works exactly. Quote Link to comment Share on other sites More sharing options...
Rom Hunter Posted April 12, 2022 Author Share Posted April 12, 2022 3 hours ago, alex_79 said: Argentina used the PAL-N TV system, which is 50Hz like European PAL but with some differences in the color signal. Atari 2600 consoles were available in this format, but I haven't found tech info about those, only a few pictures here (Note the "PAL-N" or "PN" printed on the labels). Most of the games above are converted from the NTSC version and retain the NTSC colors. So I wonder what palette the PAL-N console uses. Alex_79, correct me if I'm wrong, but later Argentinian consoles were compatible with NTSC carts, right? Quote Link to comment Share on other sites More sharing options...
alex_79 Posted April 12, 2022 Share Posted April 12, 2022 3 hours ago, Rom Hunter said: Alex_79, correct me if I'm wrong, but later Argentinian consoles were compatible with NTSC carts, right? Technically, all 2600 consoles will play all 2600 games, but the games themselves determine the framerate and vertical resolution, so the resulting signal when mixing games and consoles from different regions might be non-standard. And the TV might not be able to display it. AFAIK Argentina's analog TV system has always been PAL-N, so I guess all consoles sold there used that standard. E.g. the "Edu Games 2600" clone console is PAL-N. A PAL-N console with a NTSC cartridge will produce a non standard signal (PAL-N color encoding but at 60Hz). I don't know if TV sets sold in Argentina would display that signal or not. Another difference could be the palette: NTSC and (European) PAL Atari 2600 have different palettes. When playing a NTSC cart in a PAL console the resulting signal is PAL60, which most European PAL TV will display just fine, but the colors of the games are wrong because of the different palette. Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted April 12, 2022 Share Posted April 12, 2022 7 hours ago, alex_79 said: E.g. the PAL MARIA chip in the 7800 console outputs 313 scanlines and there's no color loss there. Does that really work for all 7800 PAL consoles? I only found someone mentioning something like that in the Circus Convoy thread. Quote Link to comment Share on other sites More sharing options...
alex_79 Posted April 12, 2022 Share Posted April 12, 2022 1 hour ago, Thomas Jentzsch said: Does that really work for all 7800 PAL consoles? Yes (in 7800 mode). This is from the official "7800 Maria specs": Also check this thread: https://atariage.com/forums/topic/224025-7800-hardware-facts/ 1 1 Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted April 12, 2022 Share Posted April 12, 2022 And 262/312 scanlines are fine for the PAL 7800 too? Quote Link to comment Share on other sites More sharing options...
alex_79 Posted April 12, 2022 Share Posted April 12, 2022 In 7800 mode the video generation is completely handled by the MARIA chip which always outputs 263/313 scanlines. No color loss issue here. In 2600 mode, MARIA is disabled, TIA is enabled and it works exactly like a 2600 console. So on a PAL 7800 a 2600 game must output an even number of scanlines, else you'd experience color loss on some TVs. Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted April 12, 2022 Share Posted April 12, 2022 OK, thanks for making that clear. I totally misunderstood you. Quote Link to comment Share on other sites More sharing options...
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