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CD BackUp RAM Cart

From Sega Retro

BackupRAM MCD US Cart.jpg
Fast facts on the CD BackUp RAM Cart
Manufacturer: Sega
Made for: Sega Mega-CD
Release Date RRP Code
Sega Mega-CD
JP
¥6,300[1] G-2920
Sega Mega-CD
US
$59.99[2] ?


The CD BackUp RAM Cart (バックアップRAMカートリッジ) is a memory card designed for the Sega Mega-CD that plugs into the Sega Mega Drive cartridge port. It is for use with Mega CD games which require the user to save, as unlike ROM cartridges, there is no way of saving data on the disc itself. The unit contains 2045 blocks (1 Mbit) of memory for game saves.

For the North American version, the cart resembles a regular Genesis cartridge, aside from a blue edging saying "Sega CD", as opposed to the usual red edging found on standard Genesis cartridges. Some RPGs - most notably Shining Force CD - used this for memory, as there was often not enough space for the save files in the internal backup RAM. In the case of Shining Force CD, this cartridge allows the player to unlock the last story segment of the game, inaccessible without the backup cart due to the Sega CD's internal memory limitations.

Maximum Capacity

While the only officially-released RAM cartridge for the Sega CD has a capacity of 1 Mbit (128 KB; 2045 blocks), the system actually supports up to 4 Mbit (512 KB; 8189 blocks). The memory size is specified by a 3-bit value mapped to Main 68000 address $400001. This value indicates the memory size as a power of two, multiplied by the base memory size of 8 KB.

Memory Size
3-bit Value
@ $400001
Size (Kbit) Size (KB)
000 64 Kbit 8 KB
001 128 Kbit 16 KB
010 256 Kbit 32 KB
011 512 Kbit 64 KB
100 1024 Kbit 128 KB
101 2048 Kbit 256 KB
110 4096 Kbit 512 KB
111 not present

Physical scans

Mega-CD, US
Segacd cdbackupramcart.jpg
Cover
BackupRAM MCD US Cart.jpg
Cart
Backupram mcd us manual.pdf
Manual
Mega-CD, JP
Backup MCD JP Cover.jpg
Cover
BackupRAM MCD JP Cart Back.jpgBackupRAM MCD JP Cart.jpg
Cart
Backupram mcd jp manual.pdf
Manual
BackupRAM MCD JP Cart Label.jpg
Label

External links

References

  1. http://sega.jp/fb/segahard/mcd/backup.html
  2. File:GamePro US 073.pdf, page 110
Sega Mega-CD Hardware
 Mega CD Variations   Wondermega | LaserActive | Sega Multi-Mega | 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)
Cancelled Hardware   Game Genie