Here’s a historical community-compiled list of known Sega Dreamcast hardware part numbers. It was copied from ASSEMblergames, so thanks to Quzar, DreamCaster and everyone else who contributed! I have preserved the original question marks and uncertain translations rather than pretending every entry has been independently verified.

These first models often appear simply as HKT-0x rather than HKT-0xy0

HKT-0100 - Sega Katana Development Box (general term for Katana Boxes) HKT-0100 - Sega Katana Development Box (Set 5.00) HKT-0110 - Sega Katana Development Box (Set 5.23) HKT-0120 - Sega Katana Development Box (Set 5.24) HKT-0200 - Sega Katana Controller Box HKT-0300 - Katana Midi Sound Box HKT-0400 - Katana GD-Writer HKT-0500 - Cross Products Dreamcast GD-ROM Duplicator GD-X HKT-0600 - GD-R HKT-0700 - Sega Katana C1/C2 Checker HKT-0900 - Sega Dreamcast SYSTEM-DISC2 HKT-1100 - Dev.Cas [670-13995A Serial S700S 990084] HKT-1130 - dev.cas (SET 7) HKT-2000 - Internet Starter Kit HKT-3000 - NTSC-J Dreamcast Initial Launch Version HKT-3010 - NTSC-J Dreamcast HKT-3020 - NTSC-U Dreamcast HKT-3021 - NTSC-U Dreamcast Demo-Kiosk HKT-3030 - PAL-E Dreamcast HKT-4000 - Japanese Mini-Keyboard HKT-4100 - 4x Memory Card (also for Sonic Team version) HKT-4200 - Standard Mouse HKT-4300 - DreamKara HKT-4301 - DreamKara (Sonic) HKT-4400 - DORIMUKYASUTODORIMUWAIYA ? “Dream cast dream wire” HKT-5000 - NTSC-J Dreamcast (no-MIL CD) HKT-5010 - Dreamcast Asian Version (no modem) HKT-5100 - Dreamcast Limited Edition (Pearl Blue, Black, etc.) ? HKT-5900 - SEGAKARA @ Home ? HKT-6300 - Seaman Special Dreamcast HKT-6500 - Hello Kitty Dreamcast (with P or B appended based on color P(ink) B(lue)) HKT-6600 - Code Veronica Limited Edition Dreamcast (not sure which one) HKT-6800 - Sakura Wars Dreamcast HKT-7000 - Standard VMU HKT-7001 - Godzilla VMU (possibly VMS) HKT-7002 - VMS (Memory card, no screen) HKT-7005 - MOSURADORIMUBATORU (software with Visual Memory)? HKT-7006 - Gamera VMS (LE VMS) HKT-7007 - VMU HKT-7007 - ‘-03’ Aqua Blue VMU HKT-7007 - ‘-16’ Clear VMU HKT-7007 - ‘-18’ SGGG LE VMU HKT-7008 - ‘-01’ “BOY super invention kit, crab break ASON” ? HKT-7008 - ‘-02’ “Giant Gram VMU” HKT-7009 - ‘-01’ US Blue VMU HKT-7100 - Modem HKT-7200 - Microphone HKT-7300 - Arcade Stick HKT-7400 - Racing Wheel (Japanese) HKT-7430 - Racing Wheel HKT-7500 - Twin Sticks HKT-76xx - Keyboard (many models) HKT-7620 - Keyboard (something) HKT-7700 - Standard Dreamcast Controller (others have ‘-xx’ appended) HKT-7700 - ‘-01’ Aqua Blue Controller HKT-7700 - ‘-02’ Lime Green Controller HKT-7700 - ‘-03’ Passion Pink Controller HKT-7700 - ‘-04’ Model 2000 (?) Controller HKT-7700 - ‘-09’ Clear Black (smoke) controller HKT-7700 - ‘-18’ Clear Controller HKT-7700 - ‘-19’ Sakura Wars Controller HKT-7701 - Controller (?) HKT-7800 - Lightgun HKT-7801 - Dreamcast Cancer/gun (DORIMUKYASUTOGAN)? HKT-7900 - A/V Stereo Cable HKT-8000 - S-Video Cable HKT-8100 - VGA Box HKT-8200 - Modular Extension cable (just a phone extension) HKT-8300 - “Audio Cable”, apparently just minijack cable HKT-8500 - MOJURAKEBURU (RF Cable?) ? HKT-8600 - Puru Puru Pack HKT-8700 - Fishing Controller (PAL) HKT-8701 - Tsuri Controller (Fishing) (JAP) HKT-8820 - RF Adapter NTSC-M HKT-8830 - RF adapter HKT-9200 - MIDI cable HKT-9400 - Dreameye camera HKT-9401 - Dreameye (white box, Sega standard style) HKT-9402 - Dreameye (dreampark box) HKT-9500 - Link Cable HKT-9700 - Maracas HKT-9800 - Dreameye microphone HKT-9900 - Mouse HIT-0300 - Sega LAN Adapter HIT-0400 - BBA HIT-0401 - BBA (Usually packaging is for US, but the hardware often still says 0400) HIT-1000 - R7 Dreamcast