1 files changed, 18 insertions(+), 2 deletions(-)

M src/processor.rs

@@ 1,3 1,5 @@
+use std::io;
+
 pub struct Processor<'a> {
     reg: [u16;32],
     flags: [bool;2], //Flag A, then B


@@ 5,6 7,7 @@ pub struct Processor<'a> {
     pub memory: &'a mut [u16], //Public since memory should be modifiable by the system.
     pub disk: &'a mut [u16],
     pub vram: &'a mut [u16],
+    stdin_buf: Vec<u16>,
 }
 
 pub fn new<'a>(memory: &'a mut [u16], disk: &'a mut [u16], vram: &'a mut [u16]) -> Processor<'a> {


@@ 15,6 18,7 @@ pub fn new<'a>(memory: &'a mut [u16], disk: &'a mut [u16], vram: &'a mut [u16]) 
         memory,
         disk,
         vram,
+        stdin_buf: Vec::new(),
     }
 }
 


@@ 286,8 290,20 @@ impl <'a> Processor<'a> {
                         1 => self.reg[operands.0] = self.memory[self.reg[operands.1] as usize], //Main memory
                         2 => self.reg[operands.0] = self.disk[self.reg[operands.1] as usize], //Disk
                         3 => self.reg[operands.0] = self.vram[self.reg[operands.1] as usize], //VRAM
-                        4 => todo!(), //Serial port, todo as stdin handling would be preferably
-                          //dealt with as part of the main program loop
+                        4 => { //Serial port
+                            if self.stdin_buf == Vec::new() { //Fill stdin_buf if empty
+                                let mut buffer = String::new();
+                                io::stdin().read_line(&mut buffer).expect("STDIN read failure");
+                                for byte in buffer.as_bytes().iter().rev() { //Reversed so values
+                                                                             //can be simply popped
+                                                                             //from the vec
+                                    self.stdin_buf.push(*byte as u16);
+                                }
+                            }
+                            self.reg[operands.0] = self.stdin_buf.pop().unwrap_or(0); //If stdin is
+                                                                                      //empty, pass
+                                                                                      //in 0
+                        }
                         _ => return true
                     }
                 }