All New World of Lemmings (AGA)

[finkel]

Is there some WinUAE configuration that will make this fantastic game work?

The problem manifests as game freezing up after one of the levels is chosen in the menu (one of the lemmings is clicked on). Configuration I'm using is:
- 68020
- AGA chipset, Chipset extra A1200
- Advanced Chipset: Compatible Settings
- KS ROM v3.1 (A1200) rev 40.68 (512k) [391773-01/391774-01]
- RAM: CHIP = 2MB, Fast = 4MB
- Workbench 3.1
- WHDLoad version of the game

I've tried different variations of Cycle-exact, More compatible, and JIT settings, but no success so far.

If this should be considered as a bug report, here are some (more useful ) details.

I noticed the same problem in UAE4ALL, and I was able to get rid of it by reordering instruction emulation and interrupt handling in m68k_emulate(). Here are some comments that I kept in UAE4ALL code, so hopefully, they may be of some help. To avoid confusion, Cruise for a Corpse works perfectly in WinUAE, it's just Lemmings that seems to be having this problem.

/* ... code may miss out
* on the change to VBL (bit 5 of intreq).
*
* Example: Cruise for a Corpse
* - game uses a tight MOVE/BTST/BEQ loop to test for VBL
* - vsync_handler() sets VBL at some point during emulation
* - m68k_emulate() is called next
* - since line 3 is active, ROM interrupt code is called,
* and it clears VBL bit
* - MOVE/BTST/BEQ misses out on the change to VBL,
* resulting in an infinite loop
*/

/* Different behavior for 68000 (KS 2.0) and 68020 (KS 3.1 A1200).
* First requires interrupts to be handled after the first
* emulated instruction (Cruise for a Corpse, 68000),
* second requires handling them before (All New World of Lemmings, 68020).
*/

[Toni Wilen]

I don't care much about whdload versions unless it also happens on confirmed working disk images using basic a500 or a1200 quickstart modes.

Interrupts are emulated nearly correct in cycle-exact mode (100% 68000 interrupt timing would require partial 68000 microcode emulation..). It is impossible to have correct interrupt "delay" behavior without cycle exact emulation.

There are 2 delay types:

- Paula interrupt bit change -> CPU interrupt level pins state change. (This is very important, many A500 demos do that stupid testing with interrupts enabled..)
- CPU detecting interrupt change (68000 does this in microcode, not all instructions have same "delay"..)
- 68020+, no one knows how it exactly works.

[Arnie]

Originally Posted by finkel

- 68020
- AGA chipset, Chipset extra A1200
- Advanced Chipset: Compatible Settings
- KS ROM v3.1 (A1200) rev 40.68 (512k) [391773-01/391774-01]
- RAM: CHIP = 2MB, Fast = 4MB
- Workbench 3.1
- WHDLoad version of the game
*/

I'm using the exact same config and the game works fine.

Have you tried changing the the misc/graphics API:?

I use Windowed display with directdraw.

What HD are you using, Directory, HDF or real HD?

[finkel]

Originally Posted by Arnie

Have you tried changing the the misc/graphics API:?

I use Windowed display with directdraw.

What HD are you using, Directory, HDF or real HD?

Display is set to Primary Display Driver (that should probably mean DirectX), Native Mode Windowed, but I don't think that's the problem. The mouse still works in the menu, and can be moved around, it's just that nothing is happening.

I'm using directory HD, so I'll try to move it to HDF and try again.

What's important is that game works for someone, so it's obviously not WinUAE problem.

Originally Posted by Toni Wilen

I don't care much about whdload versions unless it also happens on confirmed working disk images using basic a500 or a1200 quickstart modes.

Any link to get hold of those working images?

Edit: Never mind... Found some floppy images, and yep, they work. It's WHDLoad version that somehow messes things up.

[Toni Wilen]

WHDLoad version works fine here, even with JIT enabled, 68020 CPU, lots of RAM and stuff.

[ck1200]

I have the game fully working through uae , hope you get it sorted

[Arnie]

What WHDload version are you using? I use the one from the KillerGorilla packs.

[hexaae]

This game is okay, even launched from WB.
There was a cracked version widley spread that freezes loading the Ninja Lemmings level. It was a missing file problem....