VGHF Tengen lot
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On December 17, 2025, Video Game History Foundation released a set of prototypes and EPROM dumps sourced from Tengen.
Mystery EPROMs
These prototypes were assembled from a set of loose EPROMs which were also dumped on December 17, 2025.
| System | Labels | Date | Retail release dates | |
|---|---|---|---|---|
| Hydra (Atari Lynx prototype) | Atari Lynx | T08 | US 1992 EU 1992 | |
| Kawasaki Superbike Challenge (SNES prototype) | SNES | T04 T05 |
US Dec 1995 EU 1995 | |
| Magical Puzzle Popils (Incomplete prototype) | NES | POPIL PRG1 POPIL PRG2 POPIL PRG3 POPIL CHR0 POPIL CHR1 |
Unreleased | |
| Pac-Man (Unlicensed prototype) | NES | PMtest 2 PDAT-L 0445 PMtest 2 CDAT-L 1BE7 |
US Oct 1988 | |
| Prince of Persia (Mega Drive prototype C) | Sega Mega Drive | Pop IC# | US Jan 1994 EU Apr 1994 | |
| Power Drive Rally (prototype) | Atari Jaguar | PDR 5-8 T35 VERSION WITH POWER DRIVE |
US Oct 9, 1995 EU Oct 1995 | |
| Rampage: World Tour (Game Boy Color prototype) | Game Boy Color | T11 | US Dec 1998 EU 1999 | |
| The Lawnmower Man (Early SNES prototype) | SNES | LAWNMOWER MAN SNES (C) 1993 SALES CURVE LTD | US Nov 8, 1993 EU 1993 JP Feb 11, 1994 | |
| The Lawnmower Man (Jun 23, 1993 prototype) | Sega Mega Drive | LAWNMOWER MAN SEGA 0 (C) 1993 SALES CURVE LTD LAWNMOWER MAN SEGA 1 (C) 1993 SALES CURVE LTD SALES CURVE LTD LAWNMOWER MAN SEGA 3 (C) 1993 |
Jun 23, 1993 | US 1994 EU Nov 1994 |
| Wayne Gretzky and the NHLPA All-Stars (Atari Jaguar prototype) | Atari Jaguar | T29 T30 T31 T32 |
Unreleased |
Hard Drive Data
These prototypes were recovered from a VAX hard drive image. The files had all been deleted, so a reverse-engineering process had to be done to recover them. This also means a few of the prototypes were damaged/incomplete.
| System | File | Date | Retail release dates | |
|---|---|---|---|---|
| European Club Soccer (Oct 8, 1991 prototype) | Sega Mega Drive | FOO10-08.bin | Oct 8, 1991 | EU Jul 1992 |
| Paperboy & RoadBlasters (May 26, 1990) | Sega Mega Drive | RDPB0102.bin | May 26, 1990 | |
| Pit Fighter II (Apr 5, 1993 prototype) | Sega Mega Drive | PT204-05.ZIP | Apr 5, 1993 | Unreleased |
| Power Wing (Mar 16, 1993 prototype) | Sega Mega Drive | WING0316.bin | Mar 16, 1993 | JP Jun 11, 1993 US Unreleased |
| Prime (May 17, 1994 prototype) | Game Gear | PRGG517.bin | May 17, 1994 17:38:00 | Unreleased |
| Prime (Jun 17, 1994 prototype) | Game Gear | GGP0627.bin | Jun 17, 1994 18:09:18 | Unreleased |
| R.B.I. Baseball '93 (Dec 22, 1992 prototype) | Sega Mega Drive | RBI12-22.bin | Dec 22, 1992 | US Jun 1993 |
| Spider-Man (Aug 9, 1990 prototype) | Sega Mega Drive | SPD08-09.bin | Aug 9, 1990 | Unreleased |
| Star Mobile (Nov 29, 1991 prototype) | Sega Mega Drive | STAR.bin | Nov 29, 1991 | WW Oct 27, 2022 |
| The World of Sport: Golf (Feb 25, 1993 prototype) | Game Gear | Feb 25, 1993 14:49:30 | Unreleased | |
| Thunder Force IV (Jun 15, 1992 prototype) | Sega Mega Drive | TF4-0615.bin | Jun 15, 1992 | JP Jul 24, 1992 US 1992 EU 1992 |
| Xybots II (Nov 16, 1993 prototype) | Sega Mega Drive | XYB11-16.BIN | Nov 16, 1993 | Unreleased |
| Xybots II (1994 prototype) | Sega Mega Drive | X2.BIN | 1994 | Unreleased |
Other
This prototype does not match the previous criteria.
| System | Labels | Date | Retail release dates | |
|---|---|---|---|---|
| Police Academy (Nov 30, 1990 prototype) | NES | Police PRG 11-30 Police CHR 11-30 |
Nov 30, 1990 | Unreleased |
Matches
The prototypes below match final builds, or builds that were previously released in some shape or form.
| Game | System | Source | Labels/File | Date | Notes |
|---|---|---|---|---|---|
| Arcade's Greatest Hits: The Atari Collection 1 | SNES | Loose EPROM | T09 | Matches final US save for 1 byte | |
| Gauntlet | NES | Loose EPROMs | Gaunt PL 9802 Gaunt PH 94C9 Gaunt C 46F0 |
Matches the February 24, 1988 prototype | |
| Gauntlet | NES | Loose EPROMs | 336001-2011A LO 68AD 336001-2011B HI 883A 336001-2012 4DAB |
Matches final US | |
| Junker's High | Sega Mega Drive | Hard drive disk -> Compiled ROM file | JH09-15.bin | Sep 15, 1992 | Matches a prototype previously released by Hidden Palace on January 1, 2022 (formerly Prototype B) |
| Ms. Pac-Man | Sega Mega Drive | Loose EPROMs | PAC L PAC R |
Matches final US/EU save for 1 byte | |
| Off the Wall | TurboGrafx-16 | Loose EPROMs | T26 T27 T28 |
Matches a prototype previously released by SMSPower.org on July 23, 2017 | |
| Power Drive Rally | Atari Jaguar | Loose EPROMs | IC(...) PDR 7-(...) T33 T34 |
Matches final | |
| Race Drivin' | Sega Mega Drive | Loose EPROMs | Race Drivin 8-5r IC1 T07 |
Aug 5, 1993 | Matches final US |
| Relief Pitcher | SNES | Loose EPROM | RP SNS 0 | While only the first EPROM exists, it matches final US | |
| Steel Talons | Sega Mega Drive | Hard drive disk -> Compiled ROM file | STT0225J.bin | Feb 25, 1993 | Final JP with different header |
| Steel Talons | Sega Mega Drive | Loose EPROMs | Steel Tallon 731R IC1 Steel Tall 731R IC2 |
Jul 31, 1992 | Matches a prototype previously released by INDEPENDENT on August 26, 1992 (formerly Prototype A) |
| Steel Talons | Sega Mega Drive | Loose EPROM | Steel Talons 8-13 IC2 | Aug 13, 1992 | While only the lower EPROM exists, it matches final US/EU |