Nitro2k01 at 02:36, 5 April 2020

2020-04-05T02:36:42Z

Beannaich at 12:19, 25 May 2012

2012-05-25T12:19:51Z

Beannaich: Created page with '== MBC2 (max 256KByte ROM and 512x4 bits RAM) == ===0000-3FFF - ROM Bank 00 (Read Only)=== Same as for MBC1. ===4000-7FFF - ROM Bank 01-0F (Read Only)=== Same as for MBC1, but …'

2012-05-25T12:13:26Z

Created page with '== MBC2 (max 256KByte ROM and 512x4 bits RAM) == ===0000-3FFF - ROM Bank 00 (Read Only)=== Same as for MBC1. ===4000-7FFF - ROM Bank 01-0F (Read Only)=== Same as for MBC1, but …'

New page

== MBC2 (max 256KByte ROM and 512x4 bits RAM) ==

===0000-3FFF - ROM Bank 00 (Read Only)===
Same as for MBC1.

===4000-7FFF - ROM Bank 01-0F (Read Only)===
Same as for MBC1, but only a total of 16 ROM banks is supported.

===A000-A1FF - 512x4bits RAM, built-in into the MBC2 chip (Read/Write)===
The MBC2 doesn't support external RAM, instead it includes 512x4 bits of built-in RAM (in the MBC2 chip itself). It still requires an external battery to save data during power-off though.
As the data consists of 4bit values, only the lower 4 bits of the "bytes" in this memory area are used.

===0000-1FFF - RAM Enable (Write Only)===
The least significant bit of the upper address byte must be zero to enable/disable cart RAM. For example the following addresses can be used to enable/disable cart RAM: 0000-00FF, 0200-02FF, 0400-04FF, ..., 1E00-1EFF.
The suggested address range to use for MBC2 ram enable/disable is 0000-00FF.

===2000-3FFF - ROM Bank Number (Write Only)===
Writing a value (XXXXBBBB - X = Don't cares, B = bank select bits) into 2000-3FFF area will select an appropriate ROM bank at 4000-7FFF.

The least significant bit of the upper address byte must be one to select a ROM bank. For example the following addresses can be used to select a ROM bank: 2100-21FF, 2300-23FF, 2500-25FF, ..., 3F00-3FFF.
The suggested address range to use for MBC2 rom bank selection is 2100-21FF.

← Older revision		Revision as of 02:36, 5 April 2020
Line 1:		Line 1:
−	{{Pandocs\|~~memorybankcontrollers~~}}	+	{{Pandocs\|mbc2}}
	== MBC2 (max 256KByte ROM and 512x4 bits RAM) ==		== MBC2 (max 256KByte ROM and 512x4 bits RAM) ==

← Older revision		Revision as of 12:19, 25 May 2012
Line 1:		Line 1:
		+	{{Pandocs\|memorybankcontrollers}}
	== MBC2 (max 256KByte ROM and 512x4 bits RAM) ==		== MBC2 (max 256KByte ROM and 512x4 bits RAM) ==

MBC2 - Revision history

Nitro2k01 at 02:36, 5 April 2020

Beannaich at 12:19, 25 May 2012

Beannaich: Created page with '== MBC2 (max 256KByte ROM and 512x4 bits RAM) == ===0000-3FFF - ROM Bank 00 (Read Only)=== Same as for MBC1. ===4000-7FFF - ROM Bank 01-0F (Read Only)=== Same as for MBC1, but …'