Protected mode works but is ugly, CS, SS work, failed lidt real mode attempt

lidt.S

@@ -0,0 +1,43 @@
+/*
+# lidt
+
+TODO get working:
+
+- http://wiki.osdev.org/Real_Mode
+
+Sets the IDTR through a from a descriptor in memory, and tells the CPU where the IDT is on memory.
+
+Expected outcome: 'ab' gets printed to the screen.
+
+osdev says this is not compatible with older CPUs.
+
+# sidt
+
+Read the descriptor register to memory.
+*/
+
+#include "common.h"
+BEGIN
+    CLEAR
+
+    lidt idt_descriptor
+
+    movw $handler, 0x04
+    mov %cs, 0x06
+
+    int $0
+    PUTC($0x62)
+    hlt
+
+idt:
+    .word 2
+    .word 4
+idt_end:
+
+idt_descriptor:
+    .word idt_end - idt
+    .long idt
+
+handler:
+    PUTC($0x61)
+    iret