diff --git a/README.md b/README.md
index 5bfc2d4..8007eef 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # RC2014 - Quazar OLED board
 
-This project provides MACRO-80 assembler code for `oled` program to drive OLED display for RC2014 by Quazar. It provides a Rust "script" to convert 128x32 black and white image to hex output suitable for the `oled` program.
+This project provides MACRO-80 assembler code for `oled` program for CP/M to drive OLED display for RC2014 by Quazar. It provides a Rust "script" to convert 128x32 black and white image to hex output suitable for the `oled` program.
 
 ## Compiling
 
diff --git a/compute.obm b/compute.obm
new file mode 100644
index 0000000..ca0b99f
Binary files /dev/null and b/compute.obm differ
diff --git a/cpm.obm b/cpm.obm
new file mode 100644
index 0000000..57aacbb
Binary files /dev/null and b/cpm.obm differ
diff --git a/oled-to-hex b/oled-to-hex
index ba7cc68..fdd203e 100755
--- a/oled-to-hex
+++ b/oled-to-hex
@@ -8,6 +8,7 @@ edition = "2021"
 
 [dependencies]
 image = { version = "0.25.8", default-features = false, features = ["png"] }
+atty = { version = "0.2.14" }
 */
 
 use image::GenericImageView;
@@ -15,7 +16,7 @@ use image::ImageReader;
 use image::Pixel;
 use std::env;
 use std::error::Error;
-use std::io::{Error as IoError, ErrorKind};
+use std::io::{stdout, Error as IoError, ErrorKind, Write};
 
 /// Example script description
 fn main() -> Result<(), Box<dyn Error>> {
@@ -23,11 +24,11 @@ fn main() -> Result<(), Box<dyn Error>> {
         ErrorKind::NotFound,
         "expected PNG 128x32 file path",
     ))?;
-    println!("Loading {}", file);
+    eprintln!("Loading {}", file);
 
     let img = ImageReader::open(file)?.decode()?;
     let (w, h) = img.dimensions();
-    println!("Loaded file {}x{}", w, h);
+    eprintln!("Loaded file {}x{}", w, h);
     if w != 128 && h != 32 {
         return Err(Into::into(IoError::new(
             ErrorKind::InvalidData,
@@ -35,6 +36,8 @@ fn main() -> Result<(), Box<dyn Error>> {
         )));
     }
 
+    let out_hex = atty::is(atty::Stream::Stdout);
+
     for row in 0..4 {
         for column in 0..128 {
             let mut byte = 0u8;
@@ -48,7 +51,11 @@ fn main() -> Result<(), Box<dyn Error>> {
                     byte = byte | 128;
                 }
             }
-            print!("{:02X}", byte);
+            if out_hex {
+                print!("{:02X}", byte);
+            } else {
+                stdout().write(&[byte]).unwrap();
+            }
         }
     }
 
diff --git a/toghxd.obm b/toghxd.obm
new file mode 100644
index 0000000..3dd4d72
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diff --git a/toghxdgr.obm b/toghxdgr.obm
new file mode 100644
index 0000000..5953728
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diff --git a/zilog.obm b/zilog.obm
new file mode 100644
index 0000000..67fc6ac
Binary files /dev/null and b/zilog.obm differ