SpritesMind.Net

Hm ... A good emulator, sound pleasant. But there is a couple of comments: 1. In "Sub Terrania" melodies a periodic strange sounds happens and BGM sounds different. Here is the record of melody "Carousel". For test purpose, you can use my PD-ROM's . I used emulator for P4. 2. I want to an advanced d...

This mean that the value written at these adresses is then read from DATA bus by additional cart hardware (chip selected by !TIME), which also do some address decoding if multiple addresses can be used (for example, bankswitching at $A130Fx, see ssf2). I have an 10in1 cart, mapper on 161 register w...

One "interesting" thing you can also see one the schematics is that the Bus Arbitrer takes only VD8 and ZD0 data lines... I presume it's because it only needs bit8 (bit 0 with 8bits access) of DATA bus when accessing the ZBUSREQ/ZBUSACK and ZRESET signals (bit8 in $A11100 and $A11200) I confirm tha...

Sega MD block schematic:

Ofcourse, cartrige attached from M68K side to it's bus (control signals gets from control chip).

I tried EDO DRAM. It cost me a major headache. I understand that the use of FPGA would simplify all my effort, but I want device wich cheaper and more importantly - easily repeated by newbie. Therefore, and focused on PSRAM. In addition, when using DDR or DDR2 or even SDRAM memory you will have to n...

Well, then you need to mark all the technical specifications of the project. If the cartridge is not designed to run ROMs, then no need put 4 Mbytes buffer. Use only RAM in console or add a small buffer if necessary. Boot ROM will just have to put to the work with MMC/SD. But USB, IMHO, is not neede...

Hint: There are no need in USB, when you using BROM/PSRAM/SD-MMC cartridge. But when you need to transmit some SYNC signals - you can use MD joystick port.

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 S...

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 bit...

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 conta...

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?