try this: if you have AMIBIOS go to advanced settings and turn "MEMORY REMAPPING" to "OFF" , save/reboot and see if it helps...

keropi wrote:

try this: if you have AMIBIOS go to advanced settings and turn "MEMORY REMAPPING" to "OFF" , save/reboot and see if it helps...

I have AMIBIOS, but I do not see that option in the BIOS menu at all unless I am missing something.

strange, the 386/486 boards I have here have this option... it actually fixed jazz on a 386DX40 and 486DX2 build I made...

keropi wrote:

strange, the 386/486 boards I have here have this option... it actually fixed jazz on a 386DX40 and 486DX2 build I made...

Knowing my luck it is probably hidden somewhere that is obvious yet I didn't notice, probably also doesn't help that most of the hardware for this computer I am using was optimized for Windows for the most part.

or it's a stripped setup like OEM computers usually do.

leileilol wrote:

or it's a stripped setup like OEM computers usually do.

Probably is though I can't be too sure. All I know is that for a Windows computer from 1999, it wasn't very good for Windows 9x gaming that required 3D acceleration. For DOS, at least when I played with DOS in Windows 98 it was a solid machine for that purpose.

You could try AMISETUP (search for amis2990.zip) to access hidden AMI BIOS settings. Don't know if this still works for a machine from 1999 but it doesn't hurt to try.

idspispopd wrote:

You could try AMISETUP (search for amis2990.zip) to access hidden AMI BIOS settings. Don't know if this still works for a machine from 1999 but it doesn't hurt to try.

My newbie-ness might be at hand here but I tried that and I can't seem to do anything because the program says that my BIOS is not compatible.

Hi. First post here and a bump for an unresolved issue, it seems. I have the exact same problem with those two games. I tried TPPATCH and CTBPPAT to no avail as well as MoSlo. The Jazz Jackrabbit CD comes with shareware versions of Tyrian, One Must Fall, and Epic Pinball. The weird thing is that the latter two work fine. I can get Jazz and Tyrian to work if I start them up from Windows 98, but I'd rather start them up from DOS.

I am using a Toshiba Tecra 550CDT laptop. My BIOS doesn't have a memory remapping option either.

Problem solved, I believe. The Tecra came loaded with 96MB of RAM, so I removed the 64MB expansion card. Jazz ran with MoSlo before patching, ran without it after using CTBPAT. Just doesn't play well with lots of memory, I guess.

boxpressed wrote:

Problem solved, I believe. The Tecra came loaded with 96MB of RAM, so I removed the 64MB expansion card. Jazz ran with MoSlo before patching, ran without it after using CTBPAT. Just doesn't play well with lots of memory, I guess.

I figured out my issue as well, but it requires me to nab a decent VGA card for the machine since the integrated ATI chip doesn't work well in pure DOS mode. I say that since Commander Keen fails to work right on there as well.

SpooferJahk wrote:

the integrated ATI chip doesn't work well in pure DOS mode. I say that since Commander Keen fails to work right on there as well.

There have been many threads posted here in the past on getting Commander Keen (I assume you mean Keen 4-5-6) to behave; the performance of Keen seems to be a poor basis for assuming that the chip doesn't work well.

Jorpho wrote:

SpooferJahk wrote:

the integrated ATI chip doesn't work well in pure DOS mode. I say that since Commander Keen fails to work right on there as well.

There have been many threads posted here in the past on getting Commander Keen (I assume you mean Keen 4-5-6) to behave; the performance of Keen seems to be a poor basis for assuming that the chip doesn't work well.

Can you link me to said threads? I apologize if I came to a sudden conclusion but I haven't really worked on this DOS project since a month after creating this thread, and definitely going to get back to it much later when I can acquire a much better sound card as well since the SB16 clone I have has major compatibility issues alongside a few other things.

SpooferJahk wrote:

Can you link me to said threads?

search.php?keywords=Commander+Keen&terms=all& … 0&submit=Search

I know this is a old topic, but since I've been surprised by the same problem on one of my old machines I investigated it and found out that Tyrian/Tyrian 2000 seems to have this behavior when you hame EMM386 with NOEMS in your config.sys. Found that out with the selective startup (F8). This computer is on "pure" DOS 6.22, with no modified files. I'm going to try to use "newer" himem and emm386 as suggested on MDGX. Funny enough, it ran flawless on another of my old computer, but this one's running on DOS 7.1 (great job to whoever put it together, saved me lots of time).

Snayperskaya wrote:

I know this is a old topic, but since I've been surprised by the same problem on one of my old machines I investigated it and found out that Tyrian/Tyrian 2000 seems to have this behavior when you hame EMM386 with NOEMS in your config.sys. Found that out with the selective startup (F8). This computer is on "pure" DOS 6.22, with no modified files. I'm going to try to use "newer" himem and emm386 as suggested on MDGX. Funny enough, it ran flawless on another of my old computer, but this one's running on DOS 7.1 (great job to whoever put it together, saved me lots of time).

Been a while since I have tried to fix the issue, but my plan is to eventually get the parts to make the machine more DOS friendly in general. I need a better sound card and a proper VGA card to have working drivers for.

Are you using DOS 6.x or 7.1? I'd give 7.1 a try if you didn't already. Comes with sound drivers for quite some cards, add-ons (such as Volkov Commander, although I like Norton's better, maybe because I used it for almost 10 years).

Snayperskaya wrote:

Are you using DOS 6.x or 7.1? I'd give 7.1 a try if you didn't already. Comes with sound drivers for quite some cards, add-ons (such as Volkov Commander, although I like Norton's better, maybe because I used it for almost 10 years).

DOS 6.22 actually, but again, going to try and give it better parts anyways. It really needs a better sound card since the one I am using is a pretty bad SB16 clone. Can't remember the name but it does not work right with some games I have so I am aiming to get an AWE32 card or an actual SB16 card.

Snayperskaya wrote:

I know this is a old topic, but since I've been surprised by the same problem on one of my old machines I investigated it and found out that Tyrian/Tyrian 2000 seems to have this behavior when you hame EMM386 with NOEMS in your config.sys.

Interesting and thank you for sharing. 😀 No less interesting follow-ups are:

1) What happens if you use EMM386 with different parameters (like RAM)?
2) Why would someone want to have EMM386 NOEMS in their configuration? Can EMS emulation really hurt anything? And if it can, and if you really don't need EMS, then perhaps it's better to use UMBPCI, the real-mode DOS UMB allocator.

Snayperskaya wrote:

I'd give 7.1 a try if you didn't already. Comes with sound drivers for quite some cards, add-ons (such as Volkov Commander, although I like Norton's better, maybe because I used it for almost 10 years).

I am quite confident no raw DOS 7.1 comes with any of these. You must have used some customized build where someone packaged these drivers/utilities.