Revert "Throw out previous x86 stuff"

This reverts commit 807db4a592.

com/asm86.asm

@@ -0,0 +1,21 @@
+org 0x100
+
+jmp start
+
+%include "fcbparse.asm"
+
+fcb_asm:
+  times 36 db 0
+
+fcb_bin:
+  times 36 db 0
+
+fcb_lst:
+  times 36 db 0
+
+start:
+  mov si, 0x81
+  mov bx, fcb_asm
+  mov ax, 0x1234
+  call fcb_parse
+  ret

com/hello.asm

@@ -0,0 +1,17 @@
+org 0x0100
+
+main:
+  mov si, hello
+.loop:
+  lodsb
+  test al, al
+  jz .ret
+  mov dl, al
+  mov cl, 0x02
+  call 5
+  jmp .loop
+.ret:
+  ret
+
+hello:
+  db "Hello!", 0x0A, 0x0D, 0