released intro lecture

commit dd86a6824e586686cab220fe9bf859a8d674f4ef
Author: Chris Gregg <[email protected]>
Date:   Mon Jan 6 06:19:42 2025 -0800

    released intro lecture

Author: tofergregg

_data/unreleased.csv

@@ -29,7 +29,6 @@ permalink,title,released
 "/lectures/Framebuffer/","Graphics and the framebuffer",false
 "/lectures/Interrupts1/","Interrupts",false
 "/lectures/Interrupts2/","Interrupts, cont'd",false
-"/lectures/Intro/","Introduction and welcome",false
 "/lectures/Keyboard/","Keyboards and the PS/2 Protocol",false
 "/lectures/Linking/","Modules, Libraries, and Linking",false
 "/lectures/Memory/","Memory Management",false

lectures/Intro/README.md

@@ -0,0 +1,13 @@
+---
+released: true
+permalink: /lectures/Intro/
+title: Introduction and welcome
+readings: |
+    Readings:
+    + For background, review our guides on [electricity](/guides/electricity/), [binary/hexadecimal numbers](/guides/numbers/), and the [unix command line](/guides/unix). 
+    + Bookmark this collection of [unix video tutorials](https://web.stanford.edu/class/archive/cs/cs107/cs107.1186/unixref/) that were prepared for CS107 students. These videos cover basic concepts, common utilities, development tools, and productivity features.
+    + An [interactive tour of Mango Pi board](https://mangopi.org/_media/mq-pro-v12-ibom.html)
+    + The [Ripes RISC-V simulator](https://ripes.me/)
+    + A "for fun" diversion: Steven Wolfram's blog post [Untangling the Tale of Ada Lovelace](http://blog.stephenwolfram.com/2015/12/untangling-the-tale-of-ada-lovelace) traces the work of Charles Babbage and Lady Ada Lovelace to develop the concept of a general-purpose computer.
+
+---

lectures/Intro/code/README.md

@@ -0,0 +1,23 @@
+# RISC-V instructions
+
+Try pasting these instructions into the [Ripes visualizer](https://ripes.me/)
+
+```
+# li pseudoinstruction, look at executable code to see actual instructions
+li a0,5
+li a1,6
+
+# rtype: 2 sources both regs
+add a2,a1,a0
+sub a2,a1,a0
+and a2,a1,a0
+or a2,a1,a0
+xor a2,a1,a0
+
+# itype: 1 source reg, 1 source 12-bit immediate (constant)
+
+addi a2,a2,45
+addi a2,a2,-1  # no subi
+andi a2,a2,0xf
+ori a2,a2,0xf
+```