Updating the USB-NES firmware fixes bugs and improves overall cart compatibility. Please visit the firmware upgrage homepage for more info: https://usbnes.com/usb-nes-firmware-upgrades-compatibility/ Shift your bits with USB-NES! https://www.ebay.ca/itm/313633595573 https://www.ebay.ca/sch/taysndbra/m.html This video is part 2 of a 2 part series where we look at how to upgrade the USB-NES unit firmware. In this video we will be focused on updating the USB-NES kernel. Part 1 here: https://www.youtube.com/watch?v=4rYIT7QQth8 The USB-NES kernel is easy to update via USB. The first thing you need to do is plug your USB-NES into the computer with no cartridge plugged in. Be sure that your computer's hidden and system files are visible. In Windows, you can check the kernel version of your USB-NES by right-clicking on the USB-NES drive and going to properties. Click on the Hardware tab, select BTTD Grp BLUE-PILL KERNEL USB Device from the list of disk drives, and click on Properties to open a new box. From here, click on the Details tab, and select Hardware Ids from the Property drop-down box. At the end of the first line in the Value window, you will see the 1.2 digit version number at the end of the string. You'll want to now head over to https://usbnes.com/usb-nes-firmware-upgrades-compatibility/ and scroll down to the Stable USB-NES Kernel Versions Available list and compare the latest version numbers there to what is on your unit. Click on the Stable USB-NES Kernel Versions Available link to spawn the kernel update tool page. On this new page click browse and select your unit's security.bin file, and select desired kernel version from the dropdown button. Click on the upload button and a firmware download link will appear shortly. Click on the link and download firmware.bin to your computer. Before you copy firmware.bin onto USB-NES, be sure to not interrupt the file transfer or cut power to the unit while the green light is on or blinking (for about 10 seconds) or you could damage your unit. Moreover, using a good computer with an uninterruptible power supply is strongly recommended for performing USB-NES kernel upgrades. After the blinking is done, you will be left with a USB-NES with no application layer. So at this point you will have to repeat the process discussed in the first video to finish setting up the USB-NES with fresh new firmware. The end. ... https://www.youtube.com/watch?v=ykkUEwzQR7w

The controller uses 2 shift registers to latch 14 buttons (excluding the analog stick) from the N64 controller, and a multiplexer to select an 8-bit stream of buttons to return to the NES based on the polarity of the clock line. Moreover, the NES will pulse the controller clock LOW to drive that data on the CPU bus and it is latched on the positive edge. However, the data entering the NES on the negative edge transition of the controller clock line is effectively ignored, and thus opens up a data communication technique allowing the extra button data to be sent over the same wire and during the same clock cycle as the classic gamepad data. ... https://www.youtube.com/watch?v=G3o8pqJN6Kw