get drive geometry

boot1.s

@@ -0,0 +1,23 @@
+org 0x7c00  
+bits 16 
+
+  ; Reveal the true nature of jen
+  xor bx, bx
+  mov ax, 17
+loop:
+  cmp bx, ax
+  jae done
+  lea si, [womble + bx]
+  mov dh, [si]
+  mov di, bx
+  shl di, 1
+  mov byte fs:[di], dh
+  mov byte fs:[di + 0x01], 0x1f
+  inc bx
+  jmp loop
+done:
+  hlt
+
+womble:
+  db "jen is a womble!"
+