I can confirm this issue, and I find a bit odd that the issue is still present in the latest SVN revision. Checked to see if my copy is corrupted but it turned out it's not. Grabbed a few more of them and the issue is still present.
The game launches just fine, you can choose your graphics mode, and everything else works just fine. Had to lower the cycles because the menu is too fast to select stuff. I configured my car, exited the shop and walked to the right to start a game. All nice and fine! So then I ran over every single junk I can find on the road like tires, logs, rocks, deer skulls and other crap that's out there just to damage the car, so I can pull over to repair it.
Red message tell me:
TRUCK DAMAGES - STOPPING FOR REPAIRS
On the repair screen I did a car diagnosis, and after I selected the key the game is frozen. I checked the debugger and I get this, actually a bunch of these messages.
CPU:Illegal Unhandled Interrupt Called 0
If I press SPACE while the car is in perfect condition, blue message:
STOPPING FOR REPAIRS
You can enter the repair screen with the SPACE bar. The weird thing is that I can't freeze the game if the car if nothing is lit on the dash. I can easily select the race flags and continue the race. However if you already did some damage to the car and tried to diagnose and repair the vehicle the game just freezes just like before, and I think this is what Ashir is referring to in this topic and also on the DOSBox compatibility list.
Tried to find some related problems and I only found two on VOGONS.
PC Compatible DeskMate
The Hidden Below - illegal interrupt
Clearly there's something wrong, even though on the Wiki mentions that the game is running very well. The only thing is that only a few people are aware of this issue.
For keys check the wiki because it's really odd to navigate the game.
http://www.dosbox.com/wiki/GAMES:4x4_Off-Road_Racing
Initial menus and shop: Arrow keys to choose, INSERT to select.
During race: LEFT, RIGHT, 0 (on keypad)
Repair during race: SPACE
Edit: I did some more tests and this time I bought a lot of spare parts, transmission fluid and other goodies, because I didn't bought anything in my previous tests.
I checked the manual of the game on lemonamiga.com and I narrowed the issue down to one button. You can check it here: http://www.lemonamiga.com/games/docs.php?id=11
Evaluate your vehicle's condition, then choose one of several options indicated by the following icons: dwell/tachometer (quality repair), hammer (make-do repair), gas can (add gas), map (view your current position and the position of the checkpoints), or checkered flag (return to the race).
The issue is not present if I press the dwell/tachometer (quality repair) icon. This is the first one in the list, but if I choose the second one the hammer (make-do repair) according to the manual the game instantly freezes and I get the "CPU:Illegal Unhandled Interrupt Called 0" errors in the debugger.
Don't know why that doesn't work, but I hope these help to fix the issue.
Edit two: What I find weird is that in the xtcabandonware video worked just fine.
Link to the video: https://www.youtube.com/watch?v=F9CvD8RImag
But on the site in the comments people are still complaining:
"IDK why, but the game crashes when I try to fix my engine..."