enable a20

readme.md

@@ -11,7 +11,7 @@ fit into 440 bytes. Its tasks are:
 
 `boot1.s` is the second-stage bootloader. Its tasks are:
 - [x] Load its own sectors not loaded by the first stage
-- [ ] Enable A20
+- [x] Enable A20
 - [ ] Detect available memory
 - [ ] Enter unreal mode
 - [ ] Read the kernel ELF from disk (don't have to parse the ELF just yet)