Earlier today, I was talking about the Sega Mega Drive and how it sometimes used software sprites (but mostly its predecessor, the Sega Master System). This made me think of the technique for a while and how I haven’t seen it detailed in any length for a while. It was not that…
VT1682 Schematic Symbols
I took a quick break to map the pinout of the VT1682 CPU unto a library for my favorite schematic editor. I use an old version of bSch i translated into English a couple of years ago. It runs fine, even on Windows 7, but the tools that convert the…
NJ Pocket initial signal analysis
To add to my previous post, I ran my oscilloscope over the pins on the small board. It exposes 44 pins, and one would expect to see 16 data pins, and the full 21 addressing space. So a quick look revealed 23 pins with a waveform like this: That seem…
Exploring the NJ Pocket
To start this blog, I want to focus on a piece of hardware that has caught a bit of interest recently. It is the NJ-250A “NJ Pocket”, a very cheap (under $20) console that can be obtained from several internet retailers:The machine itself is manufactured by Shenzen Nanjing technologies. While…