Recent content by antime

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  1. antime

    Some megadrive mini news !

    It seems like a quality product, and they definitely took a page from Nintendo's book by including Darius and Tetris, but it's maddening that each region has a different set of games.
  2. antime

    VDP1 sprites priority

    Transparency depends on the pixel data in the VDP1 frame buffer, and how VDP2 is configured to interpret it. By setting the CMDCOLR word of the sprite drawing command, you can select different priority and color calculation settings for each sprite. Chapter 9 of the VDP2 manual explains it, but...
  3. antime

    Strange address 0xFFFFFF00

    You may have to modify the emulator.
  4. antime

    Strange address 0xFFFFFF00

    0xFFFFFE00-0xFFFFFFFF is the SH7095/SH7604 on-chip peripheral address range. 0xFFFFFF00 is the DVSR register of the division unit.
  5. antime

    Motherboard Issue (Game Disc Unsuitable)

    The "Game Disc Unsuitable" message means that the console has read the game header correctly from disc or cartridge, but that the region code in the header doesn't match the region code of the console. In the Saturn, the region code is defined by four inputs pins of the SMPC, that are either...
  6. antime

    Motherboard Issue (Game Disc Unsuitable)

    If the system has been region modded, verify that the mod hasn't failed.
  7. antime

    Gunslinginninja

    The code to Wolfenstein 3D was released under the GPL, so selling that is OK as long as you follow the terms of the license. You are also allowed to redistribute the shareware assets, but not those of the full game.
  8. antime

    Gunslinginninja

    There's always bottom-feeders. These twerps are selling Nintendo ROMs, so I doubt they'll be around for long.
  9. antime

    Communication port information

    Pin 1 is the metal shell/shield around the connector. It is completely omitted from the service manual schematics, marked as "NC" in the old reverse-engineered schematics, but measured as GND on two different model boards I have. This may have varied by board type. Since we have access to real...
  10. antime

    Communication port information

    Which schematic? The pinout of the comm port connector is 1 - shell / NC 2 - Vcc 3 - SCSP Rx 4 - SCSP Tx 5 - Master SH2 Tx 6 - M Rx 7 - M SCK 8 - GND 9 - Slave SH2 Tx 10 - S Rx 11 - S SCK 12 - GND
  11. antime

    Action Replay 1MB/4MB "automatic" switch

    The USB DataLink connects to the CommLink port. It is however quite slow compared to the dev cart.
  12. antime

    Hex to Bin

    Because I was bored, here's another solution. With the table it's longer, but should run quicker. Obviously when optimizing for speed you can't beat a full 1K table, but I think this is a reasonable compromise. ! Parameters: ! r4 = source ! r5 = length (>= 1) ! r6 = dest ! Local registers: ...
  13. antime

    Hex to Bin

    Your "end of bit conversion" condition doesn't work. Depending on the MSB of the byte loaded from @r0, the cmp/pl is either always false, or always true (loads are sign-extending, and shar is sign-preserving, and the comparison is signed). Also, if any bit pattern is valid you can't early-out...
  14. antime

    USB dev cart project

    I don't know if it will actually help, but if you have a cartridge shell to spare you could try housing the PCB in that. It might make it sit more stably in the port.
  15. antime

    Hex to Bin

    0x40-0x44 is the lookup table.
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