diff --git a/8086/msdos/v4th.com b/8086/msdos/v4th.com index e95f373..3cfafc5 100644 Binary files a/8086/msdos/v4th.com and b/8086/msdos/v4th.com differ diff --git a/8086/msdos/v4thblk.com b/8086/msdos/v4thblk.com new file mode 100644 index 0000000..39a9bd3 Binary files /dev/null and b/8086/msdos/v4thblk.com differ