r1cebank's code & 🍗 & ✈️

While browsing Crowd Supply I found a very interesting device called USB Armory. Its a tiny security minded computer in the form factor of a tiny USB stick. The hardware specs is not very amazing but compared with similar device like Raspberry Pi Zero, its not that bad. Hardware SoC: NXP i.MX6ULZ ARM® Cortex™-A7 900 MHz RAM: 512 MB DDR3 Storage: internal 16 GB eMMC + external microSD Bluetooth module: u-blox ANNA-B112 BLE USB-C ports: DRP (Dual Role Power) receptacle + UFP (Upstream Facing Port) ...

It’s been a while since I have posted my findings about the Sega Nu machine. I was lucky enough to get another arcade machine for around 10,000 yen. My goal with this new machine is to carefully backup everything and then carefully make sure that I am able to get the recovery key for the bitlocker drives so I can do anything with it later on. If you haven’t read the part 1 yet, back up, back up, back up your drives! Before I was able to get the new machine shipped to Canada, I created a plan f ...

Is been couple month since I started working on the Sega Nu, this is the first arcade unit I have worked on. Working on the system has totally changed my understanding of how those system works. Before start working on the Nu, my experience with it is very limited. I started to have interest on this system after I learnt this is the system used for my favorite arcade game: Hatsune Miku: Project Diva Arcade Future Tone. I always wanted to own one of the cabinet and make it work offline in my futu ...

I’ve been building a self-contained server from an Intel Nuc, recently I decided to move my dropbox to self-hosted Seafile solution. One of the problem is, I did not encrypt the external storage when I did the system setup. When googled about encrypting existing partitions, I came up with a solution. Make sure you back up all of your data Shrink the partition using resize2fs (make sure calculate the new block size and leave around 32M) Run cryptsetup reencrypt --encrypt /dev/sdXY --reduce-devic ...

Recently I realized that the personal service server I built literally has every port accessible over LAN. I used docker-compose to build all the services I ran on the server and made sure ufw is enabled and only allow port 22 and port 443/80. During a test with a reboot lock down script,  I realized that even I disable all the ports from ufw, these ports are still accessible. After googling, I realized it has something to do with docker’s own iptables rule somehow will take precedent over ...

2020 is an interesting year, although I have made plans to attend Magical Mirai and Miku EXPO, due to the pandemic all of them has been cancelled. The work from home has became a new norm nowdays, and all the travel restrictions has made impossible for anyone to meetup with each other. Achievements Able to finish writing the gameboy emulator Lost weight to sub-80 kg Finished reading 4 books in the yearly plan Made good financial decision on stocks Obtained an PDFT keychip Passed JLPT N2 Stop Do ...

I’ve been writing my gameboy emulator in rust and I had a lot of issues getting this startup screen to display properly, later I’ve realized it was achieved using the clever pallet swapping in runtime. For pokemon red, the start screen flashing start is made possible by changing palette during runtime. 12345let palette_num = if sprite.use_palette_1 { self.op1 } else { self.op0 &# ...

static_assertionshttps://crates.io/crates/static_assertions compile time assertions for rust rusty-forkhttps://crates.io/crates/rusty-fork provide a way to run unit test in “forks” instahttps://crates.io/crates/insta snapshot testing in rust quotehttps://crates.io/crates/quote marco to turn rust syntax tree data structure into token of source code

IntroductionIn the Sega Nu systems, system boot and application start is gated by the mysterious “keychip”. A lot of systems sold online do not include the keychip since they are property of Sega and needed to be returned once the operator terminate contract with Sega. I was lucky enough to find two keychip being auctioned and I want to document my reverse engineering efforts. Hopefull later people are able to use this information to reconstruct keychip for the game they want to launch and keep ...

It’s been a while since I finished the CHIP-8 emulator, the CHIP-8 emulator was mostly capable of running PONG, but at the end I still haven’t figured out how to get input work correctly. This time I want to try to experiment with the Gameboy, it will be much harder to emulate given the increased number of instructions and a palette. DMG-01 Also known as the “original gameboy” Hardware Overview CPU: Custom 8-bit sharp at 4.19MHZ Resolution: 160*144 Framerate: 59.727hz Memory: 8KiB internal S- ...