Finally handling key presses in the console! (Took long enough, huh?) Added a dead simple console echo example program in 6502 assembly, as well.

samples/echo.asm

@@ -0,0 +1,36 @@
+;;
+;; Read input from the keyboard, and echo to console.
+;;
+
+
+.alias iobase   $c000
+.alias iostatus [iobase + 1]
+.alias iocmd    [iobase + 2]
+.alias ioctrl   [iobase + 3]
+
+.org $0300
+
+start:  cli
+        lda #$09
+        sta iocmd      ; Set command status
+        lda #$16
+        sta ioctrl     ; 0 stop bits, 8 bit word, 300 baud
+
+;; Load a character from the keyboard and store it into
+;; the accumulator
+
+getkey: lda iostatus   ; Read the ACIA status
+        and #$08       ; Is the rx register empty?
+        beq getkey     ; Yes, wait for it to fill
+        lda iobase     ; Otherwise, read into accumulator
+
+;; Write the current char in the accumulator to the console
+
+write:  pha            ; Save accumulator
+        lda iostatus   ; Read the ACIA status
+        and #$10       ; Is the tx register empty?
+        beq write      ; No, wait for it to empty
+        pla            ; Otherwise, load saved accumulator
+        sta iobase     ; and write to output.
+
+        jmp getkey     ; Repeat