ROM String Analysis

This page documents meaningful strings found in each KN5000 ROM through systematic extraction and analysis. String analysis provides valuable insights into firmware functionality, menu systems, instrument databases, and communication protocols.

Main CPU ROM (kn5000_v10_program.rom)

Size: 2MB (2,097,152 bytes) Load Address: 0xE00000 Total Strings Found: 9,446

Product Identification

Location String
0xE023F0 Technics KN5000 ~95 VOCALIST WORKSTATION

This product ID string confirms the keyboard model and its “Vocalist Workstation” designation, indicating built-in vocal processing capabilities.

Key String Tables

Address Description Count
0xE023F0 Instrument categories ~50
0xE0C3BE Chord database ~200
0xECFDFE Keyboard layout strings ~30

String Categories

Instrument Names:

  • Piano variations (Grand Piano, Upright, Electric)
  • String ensembles (Strings, Violin, Cello, Orchestra)
  • Wind instruments (Flute, Clarinet, Oboe, Saxophone)
  • Brass section (Trumpet, Trombone, French Horn)
  • Guitars (Acoustic, Electric, Nylon, Steel)
  • Synthesizer patches (Synth Pad, Synth Lead, Analog)

Menu Text:

  • Main menu items (Sound, Rhythm, Sequencer, Disk)
  • Sub-menu options (Edit, Copy, Delete, Save, Load)
  • Dialog prompts (Yes/No, OK/Cancel, Continue?)
  • Error messages (Disk Error, Memory Full, File Not Found)

Effects Names:

  • Reverb types (Hall, Room, Plate, Spring)
  • Chorus/Delay effects
  • EQ and filter settings
  • DSP processing modes

System Messages:

  • Boot messages
  • Memory test strings
  • Calibration routines
  • Debug output

Sub CPU Payload ROM (kn5000_subprogram_v142.rom)

Size: 192KB (196,608 bytes) Purpose: Tone generator and audio synthesis control Total Meaningful Strings: 88

Key Strings

Address String Purpose
0x31E3 KN5000 SOUND RAM Memory region identifier
0x31F4 User Kit User-defined drum kit designation

DSP Control Messages

The sub CPU firmware contains control messages for the DSP subsystem:

Category Strings
Reset DSP reset commands
Mute Channel mute control
Disconnect Audio path disconnect
Link Channel linking
Edit Parameter editing

String Distribution

Most strings in this ROM relate to:

  • Audio buffer management
  • DSP parameter control
  • Waveform table identifiers
  • Voice allocation messages
  • MIDI processing states

Sub CPU Boot ROM (kn5000_subcpu_boot.ic30)

Size: 128KB (131,072 bytes) Load Address: 0xFE0000 Total Strings: 11

Analysis

This boot ROM contains minimal strings, which is typical for embedded firmware:

  • ASCII Lookup Tables: Character conversion tables for serial debugging
  • No Boot Messages: The firmware does not output status messages during boot
  • No Version Strings: Unlike application firmware, boot ROMs often lack version identification

The sparse string content indicates this ROM focuses on:

  • Hardware initialization
  • Memory testing
  • Loading the main payload from the Main CPU
  • Interrupt vector setup

Table Data ROM (Interleaved Odd/Even)

Total Size: 2MB (1MB odd + 1MB even) Organization: 16-bit interleaved (odd = high byte, even = low byte) Total Strings Found: 164+

Bass Instruments

String Type
Acoustic Bass Standard
Electric Bass Standard
Slap Bass Extended
Fretless Bass Extended
Synth Bass Electronic

Percussion and Drum Kits

Standard Kits:

  • Jazz Kit
  • Rock Kit
  • Brush Kit
  • Electronic Kit

Extended Kits:

  • House Kit
  • Hip-Hop Kit
  • Latin Percussion
  • Orchestral Percussion

Notable Strings

String Description
Tubular Bells C4 Note-specific tubular bell sample
Tubular Bells D4 Note-specific tubular bell sample
Tubular Bells E4 Note-specific tubular bell sample

The note designations (C4, D4, E4, etc.) indicate multi-sampled instruments with samples for individual notes.

Rhythm Styles with BPM

Style Tempo Range
Ballad 48-72 BPM
Swing 88-140 BPM
Jazz 100-185 BPM
Rock 100-140 BPM
House 118-135 BPM

Custom Data Flash (kn5000_custom_data.ic19)

Size: 1MB (1,048,576 bytes) Load Address: 0x300000 Total Strings Found: 324 Unique Rhythm/Style Names: 89

Purpose

This flash memory stores user-customizable data including:

  • User-defined rhythms
  • Custom sound settings
  • Panel memory configurations
  • Registration data

Rhythm Categories

Category Example Styles
Jazz/Swing Big Band Swing, Bebop, Cool Jazz
Rock/Pop Classic Rock, Pop Ballad, Soft Rock
Brazilian Bossa Nova, Samba, Baiao
Latin Cha-Cha, Mambo, Salsa, Merengue
Classical Waltz, March, Polonaise

Designer Attributions

Some factory presets include designer credits:

Designer Styles
Ray Conniff Easy Listening arrangements
Arthur Various factory presets

Special Entries

Entry Meaning
Clear Empty user slot (available for user data)
Init Factory default initialization state

These markers indicate the state of user-configurable memory slots.

HDAE5000 ROM (hd-ae5000_v2_06i.ic4)

Size: 512KB (524,288 bytes) Load Address: 0x280000

Version Information

Property Value
Internal Version Technics Software section M. Kitajima 2.33J
Author M. Kitajima
Development Period Juli-Oktober 1996

PPORT Menu Commands

Commands for PC parallel port communication:

Command Description
Send Infos About HD Report HD information to PC
Exit PPORT End parallel port session
Read FSB from HD Read File System Block
Sending FSB to PC Transfer FSB to PC
Rcv FSB from PC Receive FSB from PC
Writing FSB to HD Write FSB to HD
Load HD to Memory Load file to KN5000 memory
Send data to PC Data transfer to PC
Sending files to PC File transfer to PC
Rcv data from PC Receive data from PC
Save memory to HD Save to hard disk
Delete files Delete HD files
Formating HD Format hard disk
Switch HD-motor off Spin down HD
Send XapFile flash XAP file transfer

Windows DLL Callback Names

The ROM contains Windows DLL function callback names, indicating the PC-side software interface:

  • Standard Windows callback conventions
  • File transfer protocol handlers
  • Status reporting functions

String Extraction Methodology

Strings were extracted using systematic scanning with the following criteria:

  1. Minimum Length: 4 characters
  2. Character Set: Printable ASCII (0x20-0x7E)
  3. Termination: Null-terminated (0x00) or fixed-length fields
  4. Filtering: Manual review to exclude false positives from binary data

Tools Used

  • Binary string extraction (custom scripts)
  • Cross-reference with disassembly
  • Pattern matching for structured data

References