lbaeza Posted March 11, 2016 Share Posted March 11, 2016 Hi Some game titles were released on disk back in the day, with one side featuring the Atari version of the game, and on the other side, the C64 version of the same game. I think these were called "flippy" disks. Datasoft's version of Pole Position has this feature, see the pictures of the disk. Do you know any other titles like this? Do we have a list of these games?Kind regards, Louis BQ Quote Link to comment Share on other sites More sharing options...
Paul Westphal Posted March 11, 2016 Share Posted March 11, 2016 Lucasfilm disk games did the same. Koronis Rift, The Eidolon, Ballblazer, Rescue on Fractalus. Activision too. Quote Link to comment Share on other sites More sharing options...
Rybags Posted March 11, 2016 Share Posted March 11, 2016 Pretty sure there was a disk of Elektraglide that was for both systems... that was how I got my initial copy. Quote Link to comment Share on other sites More sharing options...
Heaven/TQA Posted March 11, 2016 Share Posted March 11, 2016 System 3 = International Karate Quote Link to comment Share on other sites More sharing options...
carlsson Posted March 11, 2016 Share Posted March 11, 2016 (edited) Once I heard about disks with dual formats on the same side, but I don't know if that really works. I know the 1541 will seek for the directory + BAM at track 18, and then move the head in either direction depending on what the directory says files are located. I don't know how the Atari disk format(s) are designed, but I imagine one might be able to format only some tracks and as long as files and directory entries are kept inside that range, any two formats - possibly even a MFM and GCR side by side - could coexist. Edit: The VTOC and directory on a 810 are stored in soft sectors 360-368 out of 720, which suggests to me it is in the middle of the physical disk area so possibly it would conflict with the 1541? Edited March 11, 2016 by carlsson Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted March 11, 2016 Share Posted March 11, 2016 My copy of F-15 Strike Eagle is a flippy disk. The Atari side still boots, last time I checked. Haven't ever tried the C64 side (don't have a drive cable for the Commodore). Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Rybags Posted March 11, 2016 Share Posted March 11, 2016 For a multi format disk to work on Atari, you only need the track with the boot sector. All the others are optional. Directory/Vtoc doesn't matter in most cases as the majority of games just use raw data without a file system structure. I think 1050 actually by default will seek track 0 when you insert a new floppy or first turn the drive on. At that stage it does a density check which can be enquired by the Status command. Not sure with C= disks though if it requires a Track zero to exist. Pretty sure their drives don't even seek when a new disk is inserted. No multiple densities to worry about so no reason for complex initialisation. Quote Link to comment Share on other sites More sharing options...
+MrFish Posted March 11, 2016 Share Posted March 11, 2016 Mercenary and On-Track Quote Link to comment Share on other sites More sharing options...
lbaeza Posted March 11, 2016 Author Share Posted March 11, 2016 Lucasfilm disk games did the same. Koronis Rift, The Eidolon, Ballblazer, Rescue on Fractalus. Activision too. Guys, thanks for your replies so far. Paul, what Activision titles were released as flippy disk? Kind regards, Louis BQ Quote Link to comment Share on other sites More sharing options...
Paul Westphal Posted March 11, 2016 Share Posted March 11, 2016 Master of the Lamps, and Great American Cross County Road Race Quote Link to comment Share on other sites More sharing options...
R.Cade Posted March 11, 2016 Share Posted March 11, 2016 There are some with the game on the same side, either Apple+C64 or Atari+C64, but it's pretty rare. Off the top of my head, some Mastertronic games are like this. Quote Link to comment Share on other sites More sharing options...
+Allan Posted March 11, 2016 Share Posted March 11, 2016 http://www.atarimania.com/game-atari-400-800-xl-xe-chem-lab_1014.html Allan 1 Quote Link to comment Share on other sites More sharing options...
luckybuck Posted March 11, 2016 Share Posted March 11, 2016 Synapse SynCalc 128K version Quote Link to comment Share on other sites More sharing options...
lbaeza Posted March 11, 2016 Author Share Posted March 11, 2016 http://www.atarimania.com/game-atari-400-800-xl-xe-chem-lab_1014.html Allan Wow! Didn't know there were "educational flippy" also...cool... Kind regards, Louis BQ Quote Link to comment Share on other sites More sharing options...
AtariGeezer Posted March 11, 2016 Share Posted March 11, 2016 Add Goonies to the flippy list too... Quote Link to comment Share on other sites More sharing options...
R4ngerM4n Posted March 11, 2016 Share Posted March 11, 2016 Nearly all Mastertronic disc games. Quote Link to comment Share on other sites More sharing options...
+CharlieChaplin Posted March 11, 2016 Share Posted March 11, 2016 (edited) Nearly all Mastertronic disc games. Some of the Mastertronic disc-games were even multi-format and had both formats (e.g. C64 and A8) on one diskside !! Luckily all multi-format disks I had did not contain any copy-protection... and I always erased the evil C64 data on them... Afaik, many Datasoft programs that fitted on one diskside (e.g. Bruce Lee, Pole Position, etc.) were flippies... (Besides, all german "Europa" tapes were flippy tapes, C64 on one side, A8 on the other.) Edited March 11, 2016 by CharlieChaplin Quote Link to comment Share on other sites More sharing options...
Muzz73 Posted March 11, 2016 Share Posted March 11, 2016 There was a game called "Ninja" that came that way, too. I had it back in the day with my C=64 (before I got my hands on my first A8). Quote Link to comment Share on other sites More sharing options...
pixelmischief Posted March 11, 2016 Share Posted March 11, 2016 (edited) [DELETED] Edited March 11, 2016 by pixelmischief Quote Link to comment Share on other sites More sharing options...
high voltage Posted March 11, 2016 Share Posted March 11, 2016 (edited) I Got Chessmaster 2000 and Karateka on flippy. and all Europa Computer Club tapes came on A8/C64 flippy tape Edited March 11, 2016 by high voltage Quote Link to comment Share on other sites More sharing options...
+Ripdubski Posted March 13, 2016 Share Posted March 13, 2016 Wow! Didn't know there were "educational flippy" also...cool... Kind regards, Louis BQ And many productivity apps. Quote Link to comment Share on other sites More sharing options...
lbaeza Posted March 14, 2016 Author Share Posted March 14, 2016 First Star Software's Spy vs Spy: Quote Link to comment Share on other sites More sharing options...
Heaven/TQA Posted March 14, 2016 Share Posted March 14, 2016 @Andreas... How did the mastertronic disc format looked like? Aren't c64 format too different? Quote Link to comment Share on other sites More sharing options...
lbaeza Posted March 14, 2016 Author Share Posted March 14, 2016 Mastertronic's Ninja Hayden Software's Sargon III Kind regards, Louis BQ 1 Quote Link to comment Share on other sites More sharing options...
+CharlieChaplin Posted March 15, 2016 Share Posted March 15, 2016 @Andreas... How did the mastertronic disc format looked like? Aren't c64 format too different? Well, afair, a) the bootsectors and sectors thereafter did contain A8 data, b) followed by some empty sectors and then c) followed sectors that gave lots of read errors (contained lots of garbage, the C64 data, I guess)... So I used a sector-copy program that would read a disk and continue on errors. When the disk was read completely, I wrote the copy onto the original disk (and the copy program wrote only the readable A8 data and it wrote empty sectors for all error sectors). Therefore I ended up with an original disk with just A8 data and without any copy-protection at all (and all my flippy-disks are already A8-only disks, since I copied the A8 data onto the other side as well). At comp.sys.atari.8bit (which is completely dead nowadays!) at one point someone appeared and said that a) he knows how to get up to five different computer formats onto one diskette and b) he has the rights (or patent?) for these multi-computer-format disks... Quote Link to comment Share on other sites More sharing options...
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