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Showing posts from May, 2019

VGA Video out on BluePill

http://shadetail.com/blog/vga-video-out-on-bluepill/ One major limitation during the development of an embedded system, especially for programmers who are used to PCs, is the lack of video output. That’s exactly what Vidout provides, using only 24% of the CPU on a STM32F103.

I don't know how CPUs work so I simulated one in code

https://djhworld.github.io/post/2019/05/21/i-dont-know-how-cpus-work-so-i-simulated-one-in-code/ A few months ago it dawned on me that I didn’t really understand how computers work under the hood. I still don’t understand how modern computers work. However, after making my way through But How Do It Know? by J. Clark Scott, a book which describes the bits of a simple 8-bit computer from the NAND gates, through to the registers, RAM, bits of the CPU, ALU and I/O, I got a hankering to implement it in code. While I’m not that interested in the physics of the circuitry, the book just about skims the surface of those waters and gives a neat overview of the wiring and how bits move around the system without the requisite electrical engineering knowledge. For me though I can’t get comfortable with book descriptions, I have to see things in action and learn from my inevitable mistakes, which led me to chart a course on the rough seas of writing a circuit in code and getting a

Peraturan Menteri Terkait Keamanan Teknologi Informasi & Sistem Informasi

Dokumen terkait pengelolaan teknologi informasi nasional: Permen Kominfo No 41 tahun 2017 TATA KELOLA TEKNOLOGI INFORMASI DAN KOMUNIKASI NASIONAL – PANDUAN UMUM https://jdih.kominfo.go.id/produk_hukum/view/id/450/t/peraturan+menteri+komunikasi+dan+informatika+nomor+41permkominfo112007+tanggal+19+november+2007 Permen Kominfo No 4 Tahun 2017 PERATURAN MENTERI KOMUNIKASI DAN INFORMATIKA REPUBLIK INDONESIA NOMOR 4 TAHUN 2016 TENTANG SISTEM MANAJEMEN PENGAMANAN INFORMASI https://jdih.kominfo.go.id/produk_hukum/view/id/532/t/peraturan+menteri+komunikasi+dan+informatika+nomor+4+tahun+2016+tanggal+11+april+2016

Full Disk Images of Earth from GOES-17

http://esorensen.com/goes-part-1/ Background and Introduction Since 1975, NOAA has maintained multiple geostationary satellites to aid in weather forecasting and research. These are called GOES satellites ( G eostationary O perational E nvironmental S atellite). The first GOES satellite in 1975 was initially called GOES-A during launch and then renamed to GOES-1 upon reaching in final location in the sky. The most recent satellite is GOES-17, which was launched in March 2018 as GOES-S and recently reached its final operating point above the Pacific Ocean. There are two other GOES satellites in orbit GOES-15 (replaced by GOES-17) and GOES-16 (Atlantic coverage). There is a great overview of GOES-16 and 17 here . Here is a map of the coverage: NOAA also has a number of weather satellites in a polar orbit. These include NOAA 15, 18, and 19. These are at a lower elevation and are much easier to receive – I've gotten acceptable images using a $30 SDR and a 2m dipole