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Jazz Multimedia G-Force 128 (Tseng ET6000) can't play Jazz Jackrabbit

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First post, by clb

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Something surprising I found out recently: I've got this Jazz Multimedia G-Force 128 graphics card:

The attachment JazzET6000.jpg is no longer available

that has a Tseng ET6000 graphics chip.

Interestingly, when I fire up Jazz Jackrabbit, it gives the following glitchy rendering:

https://youtu.be/Hb7zuzRKAIw

Screenshot:

The attachment JAZZ1.png is no longer available

I haven't seen any other graphics cards produce this sprite rendering bug, and this bug doesn't occur in any other game that I've tested on this card. That makes me wonder what is Jazz Jackrabbit doing that's so unique that no other game does, and what did this card's manufacturers forget to implement correctly? Any clues to this mystery? 😁

Reply 1 of 4, by AppleSauce

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I had this issue with my ET6000 , I think it's because the card does not support mode X.

Reply 2 of 4, by Joseph_Joestar

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Now we need to find out if it works with a Media Vision Jazz 16 sound card. 😀

PC#1: Pentium MMX 166 / Soyo SY-5BT / S3 Trio64V+ / Voodoo1 / YMF719 / AWE64 Gold / SC-155
PC#2: AthlonXP 2100+ / ECS K7VTA3 / Voodoo3 / Audigy2 / Vortex2
PC#3: Core 2 Duo E8600 / Foxconn P35AX-S / X800 / Audigy2 ZS
PC#4: i5-3570K / MSI Z77A-G43 / GTX 980Ti / X-Fi Titanium

Reply 3 of 4, by clb

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I did find a comment at http://www.dosdays.co.uk/topics/Manufacturers/tseng_labs.php about ET6000:

"For DOS, ET6000 cannot do "mode x" properly, so breaks compatibility with a few games like Jazz Jackrabbit. "

However, ET6000 does support Mode-X. E.g. Epic Pinball uses Mode-X, which works on this card:

The attachment EPIC.png is no longer available

and my own SCROLL.EXE test program also uses Mode-X, and that works fine on this card:

The attachment SCROLL2.png is no longer available

Jazz Jackrabbit is a Mode-X game as well.

Though maybe there is some kind of subtle bug in how the card handles the unchained memory addressing that Mode-X has, that is not immediately obvious. Just can't figure out what that could be.

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