added a TI-74 port

README.md

@@ -139,6 +139,26 @@ implementation to be considered correct:
 4. The decryption part shall sanitize the ciphertext before processing,
    removing any whitespace and non-letter characters from the input.
 
+TI-74 BASIC port
+----------------
+The [dracondi.b74](dracondi.b74) file in this repository contains a port of the
+cipher to the Texas Instruments TI-74 handheld computer in its native BASIC
+language dialect. This port has been developed and tested on the TI-74S model
+and contains the following limitations:
+
+1. The message length is restricted by the device's line limit.
+2. No message prefiltering is done: enter the plaintext strictly in lowercase,
+without any spaces and non-alphabetical characters.
+3. The resulting ciphertext is divided with spaces every five characters but
+the last group is not autofilled.
+4. When decrypting, you can enter the ciphertext with spaces but no other non-
+alphabetical characters are allowed.
+5. No explicit exit command provided, use the BREAK key to exit the program.
+
+For field operation, this port requires your keyphrases to be hardcoded in the
+line 100 and 110 `DATA` statements. You can change the line numbers as long as
+they remain the first `DATA` statements in the device's program memory.
+
 Credits
 -------
 Created by Luxferre in 2025, released into the public domain with no warranties.