Search found 81 matches
- Thu May 16, 2013 11:33 pm
- Forum: Sound
- Topic: VGM or TFM with PCM?
- Replies: 25
- Views: 18067
- Fri May 10, 2013 10:48 pm
- Forum: Sound
- Topic: VGM or TFM with PCM?
- Replies: 25
- Views: 18067
- Tue May 07, 2013 7:44 pm
- Forum: Sound
- Topic: VGM or TFM with PCM?
- Replies: 25
- Views: 18067
- Wed May 01, 2013 11:21 pm
- Forum: Video Display Processor
- Topic: Masking (hidding) priority sprites, how?
- Replies: 6
- Views: 5737
Masking (hidding) priority sprites, how?
Returning to old good times with some questions: I read on "Sega Genesis VDP documentation" by Charles MacDonald that you can hide (or mask) sprites putting one of them on x=0, then all the horizontal lines witch the sprite resides are masked and no other further sprite will be drawn on those lines....
- Wed May 25, 2011 11:01 pm
- Forum: Megadrive/Genesis
- Topic: Problems I find if I want to create a save state for real HW
- Replies: 5
- Views: 4178
Problems I find if I want to create a save state for real HW
So lets say that we have done a flash card, or something like it, that lives within the real hardware, and we want to implement a save state for any program or game like an emulator. Is it possible? What problems will we be facing? Obtaining the CPUs status seems not so much difficult, but how about...
- Mon May 23, 2011 5:56 pm
- Forum: Hardware
- Topic: 68000 micro-instructions documents?
- Replies: 16
- Views: 21591
In case there is a collision: http://img838.imageshack.us/img838/7316/mq68kalt.jpg As much as I can tell only shifts can overlap with fetch, but the fact is they wait 6 or 8 cycles to begin working. Now i'm facing Z80 design, so 68k will be stopped for a while. Now what I realize is CPUs are a lot s...
- Fri May 20, 2011 2:12 pm
- Forum: Hardware
- Topic: 68000 micro-instructions documents?
- Replies: 16
- Views: 21591
- Sat May 14, 2011 7:33 pm
- Forum: Hardware
- Topic: 68000 micro-instructions documents?
- Replies: 16
- Views: 21591
That second patent really covers the internals. Of course, it comes from a time when patents were still valid inventions. You won't find anything close in a modern patent - the lawyers wouldn't stand for it. But that is a little hilarious, the idea is to prevent copying. Which defeats the whole pur...
- Thu May 12, 2011 6:28 pm
- Forum: Hardware
- Topic: 68000 micro-instructions documents?
- Replies: 16
- Views: 21591
You do not have enough M68KPM and M68KUM? Are these HLD dessigned CPUs? There is nothing about these words searching in Internet. I'm not aware of any documentation of what the 68000 does in each state. The closest I've seen is docs on how certain instructions "prefetch" the next instruction and ho...
- Tue May 03, 2011 10:17 pm
- Forum: Hardware
- Topic: 68000 micro-instructions documents?
- Replies: 16
- Views: 21591
68000 micro-instructions documents?
Is there a way to know what 68000 does exactly in every cycle? I mean, there are some things (PC++, decode instruction) that can be done not only in specific cycle but in 1 or 2 more. Take, for example the nop instruction, 4 cyles. Yon can do the PC:=PC+1 in the 3rd o 4th cycle. Same goes for the de...
- Tue May 03, 2011 9:31 pm
- Forum: Hardware
- Topic: HDD (or flash) instead of a CD, questions...
- Replies: 140
- Views: 169927
I read a bit of the implementation of the LC89510 and since it has his own memory, memory map and code, to replace it, we need a CPLD+RAM+ROM+PIC or, more simply, a FPGA. It looks easier to replace the CD drive and emulate the interface the LC8951 uses via a CPLD. As I see it: The CPLD to do the me...
- Sat Apr 30, 2011 1:03 pm
- Forum: Hardware
- Topic: HDD (or flash) instead of a CD, questions...
- Replies: 140
- Views: 169927
I read a bit of the implementation of the LC89510 and since it has his own memory, memory map and code, to replace it, we need a CPLD+RAM+ROM+PIC or, more simply, a FPGA. And, well, in a FPGA we can implement the whole MCD. So, as someone said, there is no point here. I dont understand why some say ...
- Fri Aug 27, 2010 9:19 pm
- Forum: Hardware
- Topic: HDD (or flash) instead of a CD, questions...
- Replies: 140
- Views: 169927
HDD (or flash) instead of a CD, questions...
I am wondering if this is possible:
1) physicaly attaching a HDD into SCD.
2) modifying the BIOS to access HDD instead CD while playing games.
The BIOS is the only code wich access to CD at low level?
or there are games that run CD directly? or do it all of
them?
Any other problem?
1) physicaly attaching a HDD into SCD.
2) modifying the BIOS to access HDD instead CD while playing games.
The BIOS is the only code wich access to CD at low level?
or there are games that run CD directly? or do it all of
them?
Any other problem?
- Fri Aug 27, 2010 8:36 pm
- Forum: Megadrive/Genesis
- Topic: Found an interesting link - Accolade Vs Sega 1992 Law Case
- Replies: 8
- Views: 6686
Nagashima stated that it was possible either to create a game program which did not contain the TMSS code but would still operate on the Genesis III... That's easier: char strng[]={'S','E'-'S','G'-'E'-'S','A'-'G'-'E'-'S'}; aux = 0; for(i=0;i<4;i++) {aux+=strng[i]; tmss[i]=aux;} I don't know if this...
- Sun Apr 11, 2010 2:44 am
- Forum: Megadrive/Genesis
- Topic: SEGA game development tools ?SEGA MD5?
- Replies: 3
- Views: 4038
SEGA game development tools ?SEGA MD5?
I don't know if this is already known, but in case is not: http://www.hygraphics.com/products.htm (From the web page itself:) An obsolete tool, development tools, early SEGA MD5 SEGA MD5 development tools, including: Complete C compiler, compilation tools, libraries; (Note: the game is different fro...