Search found 432 matches

by Miquel
Sun May 05, 2019 12:17 pm
Forum: Exodus
Topic: Active Disassembly
Replies: 13
Views: 1014

Re: Active Disassembly

I have just tested Exodus this past days and I keep my words, predictive disassembly while being much better than plain disassembly still generates holes of unknown data, here and there. Verified with my own game, so no maybe's. Active disassembly is pretty much perfect, but you need to run all code...
by Miquel
Fri May 03, 2019 11:04 am
Forum: Super 32X
Topic: Using 32x as a 3rd plane, possible?
Replies: 28
Views: 1074

Re: Using 32x as a 3rd plane, possible?

I'm not. The vector ROM points to that table… in the mirror space (i.e. $880200, $880206, $88020C, etc.). That means when an interrupt happens, the 68000 will fetch those addresses and jump to the mirror, which won't respond since the 32X disabled it, and hence the 68000 will be stuck forever waiti...
by Miquel
Thu May 02, 2019 6:39 am
Forum: Super 32X
Topic: Using 32x as a 3rd plane, possible?
Replies: 28
Views: 1074

Re: Using 32x as a 3rd plane, possible?

Anyway, I was reading the 32X docs further, and while RV=1 does indeed preserve the Mega Drive mapping for the most part… it also disables the mirror for some reason. Since the vector ROM remains in place even with RV=1 (why?!), that means interrupts won't work at all as they're hardcoded to point ...
by Miquel
Thu May 02, 2019 5:40 am
Forum: Super 32X
Topic: Using 32x as a 3rd plane, possible?
Replies: 28
Views: 1074

Re: Using 32x as a 3rd plane, possible?

Motorola couldn't up the clocks and their chips started to lag behind others (intel, IBM etc.) who were getting faster and faster, their big flagship chips weren't competitive anymore and customers moved to new things. In the end they dropped 68k line and started doing PowerPC instead... Well, for ...
by Miquel
Thu May 02, 2019 5:27 am
Forum: Super 32X
Topic: Using 32x as a 3rd plane, possible?
Replies: 28
Views: 1074

Re: Using 32x as a 3rd plane, possible?

Sorry, I haven’t explained myself properly. What I want is to use 32x hardware from the MD side only, optionally as a 3rd layer. Then what I need is to setup everything in that manner and shout down both SH2. Right now I’m weighing options. A first idea was to ignore, as much as possible, the SH2 si...
by Miquel
Wed May 01, 2019 1:39 am
Forum: Super 32X
Topic: Using 32x as a 3rd plane, possible?
Replies: 28
Views: 1074

Re: Using 32x as a 3rd plane, possible?

68040 and 68060 are the pipelined 68k series CPUs. And why end here? That bad was sales? Just around 1996 appeared plenty of cpus pushing speed around this concept [...] Yep, the boot room does this: org 0 dc.l reset ; 0: POWER ON RESET PC org 0x140 reset: org 0x2ea mov.l @(0x050, pc), r8 ; 0x00000...
by Miquel
Tue Apr 30, 2019 11:44 am
Forum: Super 32X
Topic: Using 32x as a 3rd plane, possible?
Replies: 28
Views: 1074

Re: Using 32x as a 3rd plane, possible?

Roger Chilly Willy! I expend some time reading SH2 and is pretty similar to 68k code, why Motorola didn’t do a pipelined version of the 68k then? Anyway, the boot rom of the 32x at the end jumps at whatever is in 0x24000020, what happens if there is nothing written there? The boot room first checks ...
by Miquel
Thu Apr 25, 2019 11:26 pm
Forum: Super 32X
Topic: Using 32x as a 3rd plane, possible?
Replies: 28
Views: 1074

Re: Using 32x as a 3rd plane, possible?

I just awake and all my view is occupied by a ship. Where I am? It seems the Moon… This drug is really powerful. It reminds me a bit “Star Wars” ships, whit this pointy structure, what it points? This is a level beyond hard drugs. So, kids, lesson of the day: go in life with the eyes close. Going ba...
by Miquel
Thu Apr 25, 2019 2:26 am
Forum: Demos
Topic: MD-NICCC - a 3D Mega Drive experience by TiTAN
Replies: 49
Views: 1365

Re: MD-NICCC - a 3D Mega Drive experience by TiTAN

Um, wrong, even assuming H40, the bandwidth is only somewhat larger (around 7KB vs around 6KB, if memory serves well), and in H32 they're practically identical. If the Mega Drive had been equipped with 128KB of VRAM you'd be right since in that mode it does indeed double bandwidth :​P Alas… But yea...
by Miquel
Wed Apr 24, 2019 11:10 pm
Forum: Super 32X
Topic: Using 32x as a 3rd plane, possible?
Replies: 28
Views: 1074

Re: Using 32x as a 3rd plane, possible?

Perfect! that’s exactly what I want. Now how to handle those moved vectors…

I wish there was a switch like that on life, set it to “1” and everything changes: you are in a science fiction movie for real… oh wait!
No doubt, life is the strongest drug there is.
by Miquel
Wed Apr 24, 2019 10:32 pm
Forum: Demos
Topic: MD-NICCC - a 3D Mega Drive experience by TiTAN
Replies: 49
Views: 1365

Re: MD-NICCC - a 3D Mega Drive experience by TiTAN

You have made me see it again. I settle for:
- A rough approximation with solid tiles in one plane
- Pre-rendered sprites for the borders

Again, it’s all about transfers.
by Miquel
Wed Apr 24, 2019 9:30 pm
Forum: Demos
Topic: MD-NICCC - a 3D Mega Drive experience by TiTAN
Replies: 49
Views: 1365

Re: MD-NICCC - a 3D Mega Drive experience by TiTAN

I cannot understand how SNES version that uses SuperFX still runs muuuuuuuch slower.... Yes, you do. MD has more VDP bandwidth than the SNES homonym, nearly twice if my memory serves me well. They even go to only 50hz (PAL) to maximize it. That's what really counts on this demo. I have no clue what...
by Miquel
Wed Apr 24, 2019 3:17 am
Forum: Super 32X
Topic: Using 32x as a 3rd plane, possible?
Replies: 28
Views: 1074

Re: Using 32x as a 3rd plane, possible?

As far as other stuff goes, no, you cannot really do that. 32X changes the memory map drastically , at best you need a 2in1 game, one that works on vanilla MD and other that works as 32X game. I'm probably missing something because, after looking docs a little bit, the only thing I can see is the v...
by Miquel
Sun Apr 21, 2019 8:22 pm
Forum: Demos
Topic: MD-NICCC - a 3D Mega Drive experience by TiTAN
Replies: 49
Views: 1365

Re: MD-NICCC - a 3D Mega Drive experience by TiTAN

No way, those blit’s are gigantic! VERY BIG demo in space.

Great video, thanks! now: when a game?
by Miquel
Sun Apr 21, 2019 6:39 pm
Forum: Demos
Topic: MD-NICCC - a 3D Mega Drive experience by TiTAN
Replies: 49
Views: 1365

Re: MD-NICCC - a 3D Mega Drive experience by TiTAN

Download link doesn't work.

That's a serious frame rate speed, I just need to see it for myself! ;)

EDIT: forget it, probably is my ISP blocking FTP