|
Post by GiGaBiTe on Mar 12, 2005 22:35:21 GMT -5
would it be possible to add random hardware to a game cartrige if it was programmed to use it?
example add another 68000 or more vram or ram?
|
|
Fonzie
Moldy Popcorn
h?h
Posts: 31
|
Post by Fonzie on Mar 13, 2005 4:20:34 GMT -5
Yeah, it is possible, 32x/MCD are no more than a big cart. But the idea is to don't surcharge the power supply from cart so, don't add too many hardware ;D. You can also use the clock of the cartridge port for your system. The only limit is that the mapping, limited to 4MB for genesis>Cart
|
|
oompa loompa
I AM THE GOVERNATOR
"Git 'Er Dun!"
Posts: 1,301
|
Post by oompa loompa on Mar 15, 2005 20:04:41 GMT -5
there's also that region above the 4mb that can be used. i've used it once on my first design of my sega computer, but later i realised i couldn't use the region because of the 32x =P
|
|
|
Post by GiGaBiTe on Mar 19, 2005 2:39:34 GMT -5
OOO, ill make a 128x! it will have quad hitachi sh4's @ 200 MHz each with 64 MB ram and an ati radeon 9800 gpu with 128 megs of ram. and a sound blaster audigy sound cpu. now i would die laughing if someone made that for the genesis XD i wonder if it would even work
|
|
|
Post by haroldoop on Mar 19, 2005 15:15:19 GMT -5
Well, it could work, although it would need a secondary power source, and the unit itself would probably be bigger than the Sega Genesis itself... ;D
|
|
oompa loompa
I AM THE GOVERNATOR
"Git 'Er Dun!"
Posts: 1,301
|
Post by oompa loompa on Mar 19, 2005 18:54:02 GMT -5
sh4, sound blaster, ati raedon are all gonna be hard to solder onto a pcb =P, not to mention getting the chips themselves =D
what i had in mind was a 486 133mhz for coprocessessing, fpga with an uber frame buffer for video, 1gig dram, sound blaster isa card........... can go on forever. i say a 486 because all this can be mounted on a simple prototype card =D
|
|
|
Post by Tom Maneiro on Mar 19, 2005 22:44:26 GMT -5
A SuperFX would work there?
|
|
|
Post by GiGaBiTe on Mar 20, 2005 11:59:28 GMT -5
yea the 486 would be easiest, it has the pins spaced far apart. the sh4 has like 300 pins on each cpu :x
trade up that sound blaster isa with an awe 64. those are the best isa cards and you can still get them for cheap. the best awe 64 is with the model number CT4520, because it uses less parts than the older ones.
but wouldnt you need a cpu to isa bridge controler for the sound card? and can a 486 even support a gig of ram?
|
|
|
Post by haroldoop on Mar 20, 2005 19:30:01 GMT -5
Actually, a 486 can address up to 4GB of RAM, although, for obvious reasons, most motherboards didn't support that amount of memory.
|
|
oompa loompa
I AM THE GOVERNATOR
"Git 'Er Dun!"
Posts: 1,301
|
Post by oompa loompa on Mar 21, 2005 15:44:15 GMT -5
also, i bluffed, i wouldn't put 1 gb of memory =D it'd require very little time to refresh 128mb simms already that it'd cause a lot of wait states to occur. i'd probably use old fast 486 cache memory instead
|
|
|
Post by GiGaBiTe on Mar 21, 2005 21:47:00 GMT -5
can 486's work in dualies? that would be cool..
and why use old sram for memory, you would have to have like 16 of those chips on the board to jut get even a couple of megs of memory.
|
|
oompa loompa
I AM THE GOVERNATOR
"Git 'Er Dun!"
Posts: 1,301
|
Post by oompa loompa on Mar 22, 2005 20:05:58 GMT -5
the 486 wasn't made to work in dualities (is this a word =P, i couldn't think of another word for this =D) like how pentium processors are. there are ways to make two processors work in parallel, but it takes some external hardware, like a communications ram, and memory will have to be assigned to the processors, both processors can't access the same memory
|
|
|
Post by GiGaBiTe on Mar 23, 2005 2:26:32 GMT -5
i found a place to buy sh2s and sh4s, but damn, its like 40 bucks for one chip.
R8A7780 (64 bit SH4 @ 400 MHz)
i read up on this chip, and its performance matches a high performance intel or amd chip (2.0 ghz+) that is of course if you can properly code it and create the hardware around it, unlike *cough* sega *cough*
|
|
oompa loompa
I AM THE GOVERNATOR
"Git 'Er Dun!"
Posts: 1,301
|
Post by oompa loompa on Mar 23, 2005 19:45:25 GMT -5
nah, i blame it on the compiler =P
$40 is too steep for a project =D, and the chip is a bga...................
|
|
|
Post by MaskofDestiny on Apr 5, 2005 14:25:25 GMT -5
and the chip is a bga................... You could always go the toaster oven route. Supposedly it is possible to solder BGA this way, though unless you have X-Ray equipment you have no way to guarantee you soldered it correctly. I'm sure you could hack together some kind of shared memory solution. I'm sure the 486 has some support for other bus masters (even the original 68000 had this). Of course cache coherency would be a problem, but with careful coding you can get around that (albeit with poorer performance). I don't think the SH-2s in the 32X/Saturn supported bus snooping so they were in the same boat. Still a dualie 486 seems kind of silly, though if it's all for fun it doesn't really matter I suppose.
|
|