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If the multi-cart is less than four in one, it can allow the counter to trigger multiple times (of course, it must not trigger the exponential power of 2 every time. If different reset results in different odd or even number oscillation, it seems to be acceptable). This shows that a certain game is ...

FDS has 65500 bytes of data per disk side, which is a constant and is defined specifically for FDS. For "game doctor", only one parameter needs to be modified: side_ end = (side_ offset == 65499); In this way, you have to redefine file suffixes for this disk format and do not need to be compatible. ...

This board was originally axrom. If you want to write to gxrom, the mirror mode can only be vertical or horizontal, so this board is not applicable.

You need to weld additional flying wires, connecting A10 or a11 to ciram-a10

I'm cautious about homebrew mapper, because create a new mapper, unless you really can't find another mapper that can do the same thing. Sometimes, the existing mapper already meets the demand, and I just need to expand it a little, such as adding the address line of outer PRG bank. Sometimes it is ...

yes,this cart rom working 23 CRC: 295EFA08 SHA-1: 8F4202AEACC78877DD69718EE184096CC6C7F881 System: NES-NTSC Board: KONAMI VRC2/Mapper 23, Mapper 23 PRG-ROM: 128k CHR-ROM: 128k W-RAM: 8k Solder Pad: H:0 V:1 Dump: Unknown contra (ks-7049)_001.png 类似的卡带应该还有双截龙2 MAPPER 127 （但我一直没有找到这个ROM或卡带） this cart ...

This post in November 2020 ten years later brought this old topic to mind, and I wanted to make readers who find this topic through search aware of subsequent developments as well as explore one (admittedly academic) option I had missed at the time. Nintendo were careful, and all these workarounds ...

The significance of mapping ntrom to ciram is that it can display graphics quickly without waiting to write to ciram After all, the hardware remapping is much faster than the software operation of $2006-$2007 loops. This technique is usually in junction with switching the 8K pattern of CROM to impro...

ks7049 is vrc2 clone, I dumped. But the mapper IC (KS204) only has 28 pins? yes,this cart rom working 23 CRC: 295EFA08 SHA-1: 8F4202AEACC78877DD69718EE184096CC6C7F881 System: NES-NTSC Board: KONAMI VRC2/Mapper 23, Mapper 23 PRG-ROM: 128k CHR-ROM: 128k W-RAM: 8k Solder Pad: H:0 V:1 Dump: Unknown con...

DENDY: 6527P+6538+26.601712M xtal
NTSC: 6527+6528+21.47727M xtal

make sure CPU and PPU belong to the matched chipset

Soon after you released this tool, some smart merchants used your works to pack NES ROM and sell them as SNES multi-carts. Some of them crashed due to imperfect emulation. I wonder if the manufacturer of this kind of cartridge has contacted you? If we are using open source products to do business, I...

BAT54 has 0.3V Vf，it can be accepted. Some mature designs use a PMOS to control power cut-off, or LDO with EN pin. The voltage drop of the former is also 0.3V (PMOS on the power path can be seen in most designs), while the latter is more common in handheld low-power systems Diode access should be av...

epm240 has enough capacity to emulate VRC6

thers is one thing i dont know why VRC series (2/4 /6) are so strict with SRAM timing.

two power sources and one destination port，should add diodes to prevent the short cut between different VDDs.

for example, when the board is powered on and connected to a download cable meanwhile

lidnariq wrote: ↑

Wed Nov 18, 2020 6:52 pm

aquasnake wrote: ↑

Wed Nov 18, 2020 6:25 pm

The entire BIOS ROM has only 16K PRG ROM data.

4KB. Existing dumps are overdumps.

good news for that, i can put into menu loader

I realized that I actually didn't have anything better to do at the moment, so I constructed a truth table for the entire ROM: A7 A6 A5 A4 A2 D0-D3 D4-D7 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 1 1 0 1 0 0 1 0 0 0 0 0 0 1 0 1 1 0 0 0 1 1 0 0 0 0 0 1 1 1 1 1 0 1 0 0 0 0 1 0 1 0 0 1 0 0 0 1 0...