Difference between revisions of "Sega Mega-CD/Boot ROM"

From Sega Retro
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{{rom|MCD|sha1=|md5=|crc32=8c3e3945|size=128KB|date=1993-03-29|source=[[LaserActive]] (NA) (1.02)|comments=BIOS header lists version as 0.98|quality=|file=MLD BIOS US v1.02 930329.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=8c3e3945|size=128KB|date=1993-03-29|source=[[LaserActive]] (NA) (1.02)|comments=BIOS header lists version as 0.98|quality=|file=MLD BIOS US v1.02 930329.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=9f5771d2|size=128KB|date=1993-03-29|source=[[LaserActive]] (Japan) (1.02)|comments=BIOS header lists version as 0.98|quality=|file=MLD BIOS JP v1.02 930329.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=9f5771d2|size=128KB|date=1993-03-29|source=[[LaserActive]] (Japan) (1.02)|comments=BIOS header lists version as 0.98|quality=|file=MLD BIOS JP v1.02 930329.7z}}
−
{{rom|MCD|sha1=|md5=|crc32=2ed602d7|size=|date=1993-09-22|source=[[LaserActive]] (NA) (1.04)|comments=|quality=|file=MLD BIOS US v1.04 930922.7z}}
+
{{rom|MCD|sha1=|md5=|crc32=2ed602d7|size=128KB|date=1993-09-22|source=[[LaserActive]] (NA) (1.04)|comments=|quality=|file=MLD BIOS US v1.04 930922.7z}}
−
{{rom|MCD|sha1=|md5=|crc32=b24b919d|size=|date=1993-08-10|source=[[LaserActive]] (Japan) (1.05)|comments=|quality=|file=MLD BIOS JP v1.05 930810.7z}}
+
{{rom|MCD|sha1=|md5=|crc32=b24b919d|size=128KB|date=1993-08-10|source=[[LaserActive]] (Japan) (1.05)|comments=|quality=|file=MLD BIOS JP v1.05 930810.7z}}
 
{{rom|MCD|sha1=f30d109d1c2f7c9feaf38600c65834261db73d1f|md5=e99e30eeffee8201f9eb2c6e219b6fc2|crc32=41af44c4|size=128KB|date=1991-11-14|source=[[Sega Mega-CD]] (Japan) (1.00c)|comments=Found on prototype EPROM labeled "1.00c"|quality=|file=MCD BIOS JP v1.00c 911114.7z}}
 
{{rom|MCD|sha1=f30d109d1c2f7c9feaf38600c65834261db73d1f|md5=e99e30eeffee8201f9eb2c6e219b6fc2|crc32=41af44c4|size=128KB|date=1991-11-14|source=[[Sega Mega-CD]] (Japan) (1.00c)|comments=Found on prototype EPROM labeled "1.00c"|quality=|file=MCD BIOS JP v1.00c 911114.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=3beb1ac2|size=|date=|source=[[Sega Mega-CD]] (Japan) (1.00 Rev B)|comments=HAA-2910 EPR-14088B|quality=|file=MCD BIOS JP v1.00B.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=3beb1ac2|size=|date=|source=[[Sega Mega-CD]] (Japan) (1.00 Rev B)|comments=HAA-2910 EPR-14088B|quality=|file=MCD BIOS JP v1.00B.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=f18dde5b|size=|date=|source=[[Sega Mega-CD]] (Japan) (1.00 Rev C)|comments=HAA-2910 EPR-14088C|quality=|file=MCD BIOS JP v1.00C.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=f18dde5b|size=|date=|source=[[Sega Mega-CD]] (Japan) (1.00 Rev C)|comments=HAA-2910 EPR-14088C|quality=|file=MCD BIOS JP v1.00C.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=1d9756a3|size=128KB|date=|source=[[Sega Mega-CD]] (Japan) (1.00 Rev D)|comments=HAA-2910 EPR-14088D|quality=|file=MCD BIOS JP v1.00D.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=1d9756a3|size=128KB|date=|source=[[Sega Mega-CD]] (Japan) (1.00 Rev D)|comments=HAA-2910 EPR-14088D|quality=|file=MCD BIOS JP v1.00D.7z}}
−
{{rom|MCD|sha1=|md5=|crc32=9d2da8f2|size=|date=1991-12-17|source=[[Sega Mega-CD]] (Japan) (1.00 Rev E)|comments=HAA-2910 EPR-14088E|quality=|file=MCD BIOS JP v1.00E 911217.7z}}
+
{{rom|MCD|sha1=|md5=|crc32=9d2da8f2|size=128KB|date=1991-12-17|source=[[Sega Mega-CD]] (Japan) (1.00 Rev E)|comments=HAA-2910 EPR-14088E|quality=|file=MCD BIOS JP v1.00E 911217.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=79f85384|size=|date=|source=[[Sega Mega-CD]] (Japan) (1.00 Rev H)|comments=HAA-2910 EPR-14088H, MPR-14088H-T|quality=|file=MCD BIOS JP v1.00H.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=79f85384|size=|date=|source=[[Sega Mega-CD]] (Japan) (1.00 Rev H)|comments=HAA-2910 EPR-14088H, MPR-14088H-T|quality=|file=MCD BIOS JP v1.00H.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=4be18ff6|size=|date=1992-05-01|source=[[Sega Mega-CD]] (Japan) (1.11)|comments= Dumped from Japanese model 2 sample/prototype|quality=|file=MCD BIOS JP v1.11 920501.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=4be18ff6|size=|date=1992-05-01|source=[[Sega Mega-CD]] (Japan) (1.11)|comments= Dumped from Japanese model 2 sample/prototype|quality=|file=MCD BIOS JP v1.11 920501.7z}}
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{{rom|MCD|sha1=|md5=|crc32=9f6f6276|size=|date=1993-06-01|source=[[Sega CD 2]] (Funai Model) (NA) (2.00 Rev A)|comments=MK4102 MPR-15511A-T|quality=|file=MCD2 BIOS US v2.00A 930601.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=9f6f6276|size=|date=1993-06-01|source=[[Sega CD 2]] (Funai Model) (NA) (2.00 Rev A)|comments=MK4102 MPR-15511A-T|quality=|file=MCD2 BIOS US v2.00A 930601.7z}}
 
{{rom|MCD|sha1=7063192ae9f6b696c5b81bc8f0a9fe6f0c400e58|md5=|crc32=0507b590|size=128KB|date=1993-03-30|source=[[Sega Mega-CD II]] (Funai Model) (EU) (2.00)|comments=MK4102-50 MPR-15512-T|quality=|file=MCD2 BIOS EU v2.00 930330.7z}}
 
{{rom|MCD|sha1=7063192ae9f6b696c5b81bc8f0a9fe6f0c400e58|md5=|crc32=0507b590|size=128KB|date=1993-03-30|source=[[Sega Mega-CD II]] (Funai Model) (EU) (2.00)|comments=MK4102-50 MPR-15512-T|quality=|file=MCD2 BIOS EU v2.00 930330.7z}}
−
{{rom|MCD|sha1=|md5=|crc32=4d5cb8da|size=|date=1993-06-01|source=[[Sega Mega-CD II]] (Funai Model) (EU) (2.00 Rev A)|comments=MK4102-50 MPR-15512A-T|quality=|file=MCD2 BIOS EU v2.00A 930601.7z}}
+
{{rom|MCD|sha1=|md5=|crc32=4d5cb8da|size=128KB|date=1993-06-01|source=[[Sega Mega-CD II]] (Funai Model) (EU) (2.00 Rev A)|comments=MK4102-50 MPR-15512A-T|quality=|file=MCD2 BIOS EU v2.00A 930601.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=2e49d72c|size=|date=1993-06-21|source=[[Sega CD 2]] (Sony Model) (NA) (2.11)|comments=MK-4102A MPR-15764-T|quality=|file=MCD2 BIOS US v2.11 930621.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=2e49d72c|size=|date=1993-06-21|source=[[Sega CD 2]] (Sony Model) (NA) (2.11)|comments=MK-4102A MPR-15764-T|quality=|file=MCD2 BIOS US v2.11 930621.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=c1aa217f|size=|date=1993-06-21|source=[[Sega Mega-CD II]] (Sony Model) (EU) (2.11)|comments=MK-4102A-50 MPR-15811-T|quality=|file=MCD2 BIOS EU v2.11 930621.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=c1aa217f|size=|date=1993-06-21|source=[[Sega Mega-CD II]] (Sony Model) (EU) (2.11)|comments=MK-4102A-50 MPR-15811-T|quality=|file=MCD2 BIOS EU v2.11 930621.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=d48c44b5|size=128KB|date=1993-09-07|source=[[Sega CDX]] (NA) (2.21x)|comments=MK-4121 MPR-16139-T|quality=|file=CDX BIOS US v2.21 930907.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=d48c44b5|size=128KB|date=1993-09-07|source=[[Sega CDX]] (NA) (2.21x)|comments=MK-4121 MPR-16139-T|quality=|file=CDX BIOS US v2.21 930907.7z}}
−
{{rom|MCD|sha1=|md5=|crc32=aacb851e|size=|date=1993-09-16|source=[[Sega Multi-Mega]] (EU) (2.21x)|comments=MK-4121-50 OPR-16140|quality=|file=MultiMega BIOS EU v2.21 930916.7z}}
+
{{rom|MCD|sha1=|md5=|crc32=aacb851e|size=128KB|date=1993-09-16|source=[[Sega Multi-Mega]] (EU) (2.21x)|comments=MK-4121-50 OPR-16140|quality=|file=MultiMega BIOS EU v2.21 930916.7z}}
 
{{rom|MCD|sha1=3fc9358072f74bd24e3e297ea11b2bf15a7af891|md5=|crc32=d21fe71d|size=128KB|date=1992-02-06|source=[[Sega Wondermega]] (Japan) (1.00)|comments=HWM-5010 G301|quality=|file=Wondermega BIOS JP v1.00 920206.7z}}
 
{{rom|MCD|sha1=3fc9358072f74bd24e3e297ea11b2bf15a7af891|md5=|crc32=d21fe71d|size=128KB|date=1992-02-06|source=[[Sega Wondermega]] (Japan) (1.00)|comments=HWM-5010 G301|quality=|file=Wondermega BIOS JP v1.00 920206.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=2b19972f|size=128KB|date=|source=[[Victor Wondermega M2]] (Japan) (2.00)|comments=RG-M2 G303{{fn|The ZIP file contains two dumps, a "good" dump and a "bad" dump. The "bad" dump has an incorrect HINT vector, but is otherwise identical to the "good" dump. The CRC32 listed here is for the "good" dump.}}|quality=|file=Wondermega BIOS JP v2.00.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=2b19972f|size=128KB|date=|source=[[Victor Wondermega M2]] (Japan) (2.00)|comments=RG-M2 G303{{fn|The ZIP file contains two dumps, a "good" dump and a "bad" dump. The "bad" dump has an incorrect HINT vector, but is otherwise identical to the "good" dump. The CRC32 listed here is for the "good" dump.}}|quality=|file=Wondermega BIOS JP v2.00.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=290f8e33|size=128KB|date=1993-12-27|source=[[Wondermega|JVC X'Eye]] (NA) (2.00)|comments=RG-M10BU G304|quality=|file=Xeye BIOS US v2.00 931227.7z}}
 
{{rom|MCD|sha1=|md5=|crc32=290f8e33|size=128KB|date=1993-12-27|source=[[Wondermega|JVC X'Eye]] (NA) (2.00)|comments=RG-M10BU G304|quality=|file=Xeye BIOS US v2.00 931227.7z}}
−
{{rom|MCD|sha1=|md5=|crc32=12154531|size=|date=|source=[[CSD-G1M|Aiwa CSD-G1M]] (JP) (2.11)|comments=MPR-15768-T|quality=|file=AiwaCSD BIOS JP v2.11.7z}}
+
{{rom|MCD|sha1=|md5=|crc32=12154531|size=128KB|date=|source=[[CSD-G1M|Aiwa CSD-G1M]] (JP) (2.11)|comments=MPR-15768-T|quality=|file=AiwaCSD BIOS JP v2.11.7z}}
 
}}
 
}}
  

Revision as of 15:52, 3 December 2023

Back to: Sega Mega-CD.
The original Japanese Mega-CD boot ROM, version 1.00.

All variants of the Sega Mega-CD come pre-installed with a boot ROM - a menu interface which appears when the console is given power. While a Sega Mega Drive cartridge can boot almost instantaneously, CD-ROMs require verification and loading, which depending on the quality of the disc or drive, can take several seconds. In addition to help drive the CD-ROM, the Mega-CD's boot ROM informs the user that the console is in Mega-CD mode, and crucially gives them something more interesting to look at than a blank screen.

Over time, many slightly different boot ROMs were developed by Sega (or its partners), either for localisation purposes, bug fixes or due to changes in hardware. The Wondermega for example has a different style of boot ROM to a standard Mega-CD, while the LaserActive has to accommodate the Mega LD format.

Functions

Most Mega-CD boot ROMs offer the same functionality - principally to run Mega-CD games. Most models can also play music CDs and Japanese models accept CD+G discs. As the Mega-CD also contains on-board memory for save games, the boot ROM allows users to manage data, either by removing save data they no longer need, or by transferring it to a CD BackUp RAM Cart. Later boot ROMs and the LaserActive cull some of these features, possibly as a cost-saving measure or limitations with the hardware.

On the Mega-CD, boot ROMs typically play a music track, while colourful Mega-CD and/or Sega logos dance around, demonstrating the system's rotation and scaling abilities. Boot ROM versions 2.00 and later support use of the Sega Mouse in control port 2, should users want to use that device to navigate the menus.

All of these features (and more) were also made available in the Sega Saturn and Sega Dreamcast, as well as most rival disc-based consoles.

Screenshots

Main screen

  • JP 1.00

  • US 1.00

  • EU 1.00

  • US 1.10

  • JP 2.00

  • US 2.00

  • EU 2.00

  • JP 2.11

  • US 2.21

  • EU 2.21

  • LaserActive 1.02

  • LaserActive 1.04

  • LaserActive 1.05

  • Wondermega 1.00

  • Wondermega 2.00

  • X'Eye 2.00

Audio CD playback

  • JP 1.00

  • US 1.00

  • EU 1.00

  • JP 2.00-2.11

  • US/EU 2.00

  • Wondermega 1.00

  • Wondermega/X'Eye 2.00

Storage information

  • JP 1.00

  • US/EU 1.00-1.10

  • JP 2.00

Save data menu

  • JP 1.00

  • US/EU 1.00-1.10

  • JP 2.00

Technical information

ROM dump status

System Hash Size Build Date Source Comments
Sega Mega-CD
 ?
CRC32 8c3e3945
MD5
SHA-1
128kB 1993-03-29 LaserActive (NA) (1.02) BIOS header lists version as 0.98 Download.svg (74 kB) (info)
Sega Mega-CD
 ?
CRC32 9f5771d2
MD5
SHA-1
128kB 1993-03-29 LaserActive (Japan) (1.02) BIOS header lists version as 0.98 Download.svg (74 kB) (info)
Sega Mega-CD
 ?
CRC32 2ed602d7
MD5
SHA-1
128kB 1993-09-22 LaserActive (NA) (1.04) Download.svg (74 kB) (info)
Sega Mega-CD
 ?
CRC32 b24b919d
MD5
SHA-1
128kB 1993-08-10 LaserActive (Japan) (1.05) Download.svg (69 kB) (info)
Sega Mega-CD
 ?
CRC32 41af44c4
MD5 e99e30eeffee8201f9eb2c6e219b6fc2
SHA-1 f30d109d1c2f7c9feaf38600c65834261db73d1f
128kB 1991-11-14 Sega Mega-CD (Japan) (1.00c) Found on prototype EPROM labeled "1.00c" Download.svg (80 kB) (info)
Sega Mega-CD
 ?
CRC32 3beb1ac2
MD5
SHA-1
Sega Mega-CD (Japan) (1.00 Rev B) HAA-2910 EPR-14088B Download.svg (80 kB) (info)
Sega Mega-CD
 ?
CRC32 f18dde5b
MD5
SHA-1
Sega Mega-CD (Japan) (1.00 Rev C) HAA-2910 EPR-14088C Download.svg (80 kB) (info)
Sega Mega-CD
 ?
CRC32 1d9756a3
MD5
SHA-1
128kB Sega Mega-CD (Japan) (1.00 Rev D) HAA-2910 EPR-14088D Download.svg (80 kB) (info)
Sega Mega-CD
 ?
CRC32 9d2da8f2
MD5
SHA-1
128kB 1991-12-17 Sega Mega-CD (Japan) (1.00 Rev E) HAA-2910 EPR-14088E Download.svg (80 kB) (info)
Sega Mega-CD
 ?
CRC32 79f85384
MD5
SHA-1
Sega Mega-CD (Japan) (1.00 Rev H) HAA-2910 EPR-14088H, MPR-14088H-T Download.svg (80 kB) (info)
Sega Mega-CD
 ?
CRC32 4be18ff6
MD5
SHA-1
1992-05-01 Sega Mega-CD (Japan) (1.11) Dumped from Japanese model 2 sample/prototype Download.svg (81 kB) (info)
Sega Mega-CD
 ?
CRC32 550f30bb
MD5
SHA-1
128kB 1991-12-28 Sega Mega-CD (Asia) (1.00 Rev H) Download.svg (80 kB) (info)
Sega Mega-CD
 ?
CRC32 e7e3afe2
MD5
SHA-1 c5c24e6439a148b7f4c7ea269d09b7a23fe25075
128kB Sega CD (NA) (1.00) Download.svg (85 kB) (info)
Sega Mega-CD
 ?
CRC32 c6d10268
MD5
SHA-1
128kB 1992-10-11 Sega CD (NA) (1.10 Rev B) MK-1690 MPR-15045B-T Download.svg (85 kB) (info)
Sega Mega-CD
 ?
CRC32 529ac15a
MD5
SHA-1 f891e0ea651e2232af0c5c4cb46a0cae2ee8f356
128kB 1992-10-27 Sega Mega-CD (EU) (1.00) MK-1690-18 Download.svg (81 kB) (info)
Sega Mega-CD
 ?
CRC32 dd6cc972
MD5
SHA-1
1992-12-22 Sega Mega-CD 2 (Funai Model) (Japan) (2.00) HAA-2912 MPR-15398-T Download.svg (79 kB) (info)
Sega Mega-CD
 ?
CRC32 8af65f58
MD5
SHA-1
1993-03-14 Sega CD 2 (Funai Model) (NA) (2.00) MK4102 MPR-15511-T Download.svg (85 kB) (info)
Sega Mega-CD
 ?
CRC32 9f6f6276
MD5
SHA-1
1993-06-01 Sega CD 2 (Funai Model) (NA) (2.00 Rev A) MK4102 MPR-15511A-T Download.svg (85 kB) (info)
Sega Mega-CD
 ?
CRC32 0507b590
MD5
SHA-1 7063192ae9f6b696c5b81bc8f0a9fe6f0c400e58
128kB 1993-03-30 Sega Mega-CD II (Funai Model) (EU) (2.00) MK4102-50 MPR-15512-T Download.svg (83 kB) (info)
Sega Mega-CD
 ?
CRC32 4d5cb8da
MD5
SHA-1
128kB 1993-06-01 Sega Mega-CD II (Funai Model) (EU) (2.00 Rev A) MK4102-50 MPR-15512A-T Download.svg (83 kB) (info)
Sega Mega-CD
 ?
CRC32 2e49d72c
MD5
SHA-1
1993-06-21 Sega CD 2 (Sony Model) (NA) (2.11) MK-4102A MPR-15764-T Download.svg (86 kB) (info)
Sega Mega-CD
 ?
CRC32 c1aa217f
MD5
SHA-1
1993-06-21 Sega Mega-CD II (Sony Model) (EU) (2.11) MK-4102A-50 MPR-15811-T Download.svg (84 kB) (info)
Sega Mega-CD
 ?
CRC32 d48c44b5
MD5
SHA-1
128kB 1993-09-07 Sega CDX (NA) (2.21x) MK-4121 MPR-16139-T Download.svg (86 kB) (info)
Sega Mega-CD
 ?
CRC32 aacb851e
MD5
SHA-1
128kB 1993-09-16 Sega Multi-Mega (EU) (2.21x) MK-4121-50 OPR-16140 Download.svg (84 kB) (info)
Sega Mega-CD
 ?
CRC32 d21fe71d
MD5
SHA-1 3fc9358072f74bd24e3e297ea11b2bf15a7af891
128kB 1992-02-06 Sega Wondermega (Japan) (1.00) HWM-5010 G301 Download.svg (79 kB) (info)
Sega Mega-CD
 ?
CRC32 2b19972f
MD5
SHA-1
128kB Victor Wondermega M2 (Japan) (2.00) RG-M2 G303[fn 1] Download.svg (81 kB) (info)
Sega Mega-CD
 ?
CRC32 290f8e33
MD5
SHA-1
128kB 1993-12-27 JVC X'Eye (NA) (2.00) RG-M10BU G304 Download.svg (80 kB) (info)
Sega Mega-CD
 ?
CRC32 12154531
MD5
SHA-1
128kB Aiwa CSD-G1M (JP) (2.11) MPR-15768-T Download.svg (80 kB) (info)

Footnotes

  1. ↑ The ZIP file contains two dumps, a "good" dump and a "bad" dump. The "bad" dump has an incorrect HINT vector, but is otherwise identical to the "good" dump. The CRC32 listed here is for the "good" dump.

References


Sega Mega-CD
Topics Technical specifications | History | Magazine articles | Promotional material
Hardware Mega CD (Asia | North America | Western Europe | Eastern Europe | South America | Australasia | Africa)
Sega Multi-Mega (Asia | North America | Europe | South America | Australasia)
Wondermega | LaserActive | CSD-G1M
Misc. hardware CD BackUp RAM Cart | Mega-CD Karaoke | Pro CDX
Development tools SNASM Mega-CD | PsyQ Mega-CD SDK | PSY-Q CD Emulation System (Mega-CD)
Unreleased hardware Game Genie
Retrieved from "https://segaretro.org/index.php?title=Sega_Mega-CD/Boot_ROM&oldid=940992"