docs: more notes

1 files changed, 10 insertions, 4 deletions

diff --git a/doc/assignment1.md b/doc/assignment1.md
index fd7405f..5cc7dc2 100644
--- a/doc/assignment1.md
+++ b/doc/assignment1.md
@@ -8,12 +8,18 @@ Instructions: Please answer the following questions in complete sentences. Your
 
 1. Define the concepts interrupt and trap, and explain the purpose of an interrupt vector.
 
-An interrupt vector is a list or table of interrupts. Each interrupt has an
-address to the interrupt routine to execute when the interrupt is signaled.
-A trap is a way to capture a triggered signal to allow programs to respond to
-and handl the signal.
+  An interrupt vector is a list or table of interrupts. Each interrupt has an
+  address to the interrupt routine to execute when the interrupt is signaled.
+  A trap is a way to capture a triggered signal to allow programs to respond to
+  and handl the signal.
 
 1. How does a computer system with von Neumann architecture execute an instruction?
+
+  * fetch instruction from memory and store that instruction in the instruction register.
+  * decode instruction. may cause operands to be fetched from memory and stored in some internal register.
+  * execute instruction
+  * store result back in register
+
 1. What role do device controllers and device drivers play in a computer system?
 1. Why do clustered systems provide what is considered high-availability service?
 1. Describe an operating system’s two modes of operation.