SpritesMind.Net

1,5./ Sega MEGADRIVE/GENESIS-SD/MMC Adapter %)

@HardWareMan->
But SegaIDE need lot of hardware mods /wires/...
So You must mod console...
/But maybe better solution as cartrige.../
Can it be as standalone interface for CD connector???
There no need to mod the console to use my SegaIDE. Every console with SegaCD connector can work with it. And ...

Use this. All what you need.

Quick question:
How long does reading a whole 512byte sector from a SD/MMC takes?
(Just 1 sector)
Maximum theoretical speed is 33MHz of clock signal or 33Mbits (info from datasheet). But not all cards can handle that. And bus cycle are more complex. You can use MMC+ or even SD interface (wich 8 ...

tinctu wrote:Idea>w
When it is IDE possible so it is possible to use IDE-CF reduction...

Yes, it is. CF has ATA interface and almost all storages (Compact Flashes and Microdrives) must handle the native True IDE Mode.

Okay, here's my idea: Make the cart with an FPGA, the SD card adapter, and a 4MB SRAM. Have the FPGA read the "boot sector" (however you wish to define that) into the start of the SRAM on powerup or reset. That code can then act as a loader for running programs from the SD card. It would also ...

I am doing this already 3 years. You can not use MMC / SD card program as a carrier at runtime, as these memory cards sequential access. You have to use either RAM or ROM as a buffer.

Cant see connection. If it external CRAM, then must be method to do write an palette in it. How? I want that damn shematic diagram...
PS So, how use it in Sega MD games? They dont use this bits, right?

Jorge Nuno wrote:So pins 120-123 are the color index from CRAM?

Yes. On active raster only (sun and background).

Jorge Nuno wrote:pin40 with the sun on screen? Nothing?

No signal. Logical 1 (actually 5v).
I want shematic diagram connections this pins on C2 machine....

Corrections: active only 120-123 pins.

Jorge Nuno wrote:At last LOL, and the pins?

LOL. There (on [120-127]) really have an VIDEO. And it remind an index of color. But on [18-25] still quiet. Maybe its activated on CRAM loads?
By the way: pins actived only on "sky". On text no moves there.
What do you think?

OK, finally it works.

Did it show the bios message?
Or you have no bios?
I'm trying to manually fix it... if that doesn't work then I will copy the init code
Rom sent...
I have an clone, that have no BIOS. That is correct, BIOS do init itself (TMSS), but most of clones have no BIOS. Second round...
***Not working. Can ...

It not starts. I guess you do wrong hardware initialization (or do not at all). I did same mistake, when began make own programms for MD. Do this:

*Boot code
move.l sp,a7
move.w #$2700,sr
tst.l $a10008.l
bne.s SkipJoyDetect
tst.w $a1000c.l
SkipJoyDetect:
Bne SkipTable
lea Table(pc),a5 ...

The SE-93 is a pirate VDP, TmEE has one in his megadrive (check his website if you don't beleive me)
I know this. Also SE-93 = TA-06; SE-95 = TA-04 + TA-05 and SE-95 = TA07 = YM2612.
I just sent a rom to HwMan, so he can tell me what's on those pins, but I won't release it yet because i'm using ...