Z80 Retro #18 - How SD Cards Work
An important note from @knghtbrd
You definitely gave enough warning about sda possibly being not your SD card especially on a desktop system, but … it can be your boot drive on a Raspberry Pi too. So a good rule of thumb … before you go writing over anything in /dev … check what's mounted on your system. You can do that with this command:
df -H
If you see sdaANYTHING there … don't run commands that overwrite it! Find out where your SD card is first and figure out how to modify the command appropriately.
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This video is part of a YouTube playlist/series: • Z80 Retro
The github repo seen in this video:
https://github.com/johnwinans/2063-Z8...
Related project hardware repos:
https://github.com/johnwinans/2063-Z80
https://github.com/johnwinans/2065-Z8...
A Hackaday page for Z80 Retro! projects:
https://hackaday.io/project/182190-z8...
Related Wikipedia pages:
https://en.wikipedia.org/wiki/Serial_...
https://en.wikipedia.org/wiki/SD_card
https://en.wikipedia.org/wiki/Master_...
Simplified SD card specification (you want Part-1):
https://www.sdcard.org/downloads/pls/
rjhcoding.com website with some AVR C code that might also be useful in understanding the SD card's SPI protocol.
Ben Eater's SPI interface video:
• SPI: The serial peripheral interface
Music used in this video (Vibe Tracks, Alternate) was downloaded from the YouTube Audio Library: https://www.youtube.com/audiolibrary_...
#Z80
#SDcard
#CPM
#homebrew
#retrocomputer