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  • Ricoh Theta S 360 Streaming

  • Thinking Outside the Bubble Live-Streaming from a $350 360 camera into Virtual Reality The Ricoh Theta S has achieved much praise within the VR community as being an easily affordable 360 camera that does all the things. The camera has 14MP resolution...
  • Stick a Fork in it

  • It's done! As in the software is at version 1.0 and ready to ship. _ /o) _/\/\/\_// _/NOVASAUR/ /_/{_}~~{_} Novasaur 64k CP/M vers 2.2 Copyright 1979 (c) by Digital Research a>b:uptime System uptime: 0 days, 03:18:38 CPU Load Average (last 4 mins) 0...
  • Z80 (CP/M) Writing to SD Card

  • Digging into SD card writes means shifting gears from the Boot BIOS source code since the Boot BIOS code only does reads. The CP/M BIOS code (CBIOS128.LST) which does the reads/writes after booting. Here's the BIOS code for writes to the SD Card: 0754...
  • Back to the roots ...

  • The orginal goal of this project was to make a smarter & powerfull(er) serial com to my Canon X-07 (by adding support to UARTs & uSDCards).It 's now happening ...And I hope some other ideas will come soon....
  • feels a bit empty, for reasons

  • There was an unofficial statement of "bonus points for blog posts" on the element14 community page for the "Hack Like Heck" contest, so that's why I'm posting my logs there and I'm too lazy to copy them over here. Wouldn't feel right either, so I admit...
  • Post Mortem

  • Post Mortem Well, this is the end of this project. The machine works as expected. One other problem was that I lost my boot sector twice. So I have implemented Boot Sector (for the first 8kb) Software Protection. What caused it? I don't know (other than...
  • Creating a BIOS extension

  • So cartridges in PCjr are actually PC BIOS extensions with 055h 0AAh in the beginning and this is how they checked on boot: with step 2K it's looking for 0x55 0xAA signature and then check CRC: And this piece shows how BIOS determines which algorithm...
  • Adding a Native C Compiler

  • Going the Next Level Up I was brought up on Turbo Pascal V3 and it is available for CP/M-80. But no, it is for the Z80 (or at least the one I tried did not work). Okay, a C compiler would be pretty cool. First compilers of the CP/M era are generally...
  • Multi-boot Multicomp (Part 3)

  • In the last log we got the Multi-boot monitor to run however, when BASIC was run it hung. The Z80 is trying to access I/O address 0x39 which isn't implemented yet. That's the swap back to the original BIOS code. Since it was never swapped out it...
  • Acessando diretamente a memória

  • Para economizar instruções, as transferências memóriaE/S e buscas na memória existe um circuito integrado auxiliar chamado DMA que faz todo esse trabalho exaustivo com apenas alguns bits de instrução. O dma trabalha...
  • More SD Card Write Details

  • Had to dig into the FPGA code for the SD card. Using Neal Crook's documentation of Grant Searle's version (longer pedigree on the page). The status register values are: // SD_Status bit values from Neal Crook's documentation of Grant's SD card // b7...
  • Design

  • In the first post, I shared an overview of the different options of the Connection Unit I'm looking to build over time. For now, I want to start with the simplest version, which is supposed to connect a solar system to a grid of (roughly) similar voltage,...