MOD File Format and MODRES Interface
 MOD File Structures
   Introduction
   Module Overview
   Module Name
   Sample Details
   Pattern Sequence
   Sample Count Marker
   Pattern Details
   Sampled Sound Data
   Identification Block
 MODRES Interface
   Introduction
   Version differences
   Subfunction 20     Play a module
   Subfunction 21     Test for residency
   Subfunction 22     Reset the interrupt vector
   Subfunction 23     Play a sample
   Subfunction 24     Load a module
   Subfunction 27     Play loaded module