[[image:Cpc4mb3.jpg|right|thumb|4MB expansion kit]]
== Description ==
4 MB DRAM internal memory expansion for CPC6128. * Its first 512 Kbyte are compatible with external memory expansions (Dk'tronics, Inicron RAM expansion, SYMBiFACE II etc.), using port #7Fxx (see [[Standard Memory Expansions]]).* Its first 2 MB are compatible to RAM7's 2 MB expansion.* The whole 4 MB can be used trough ports #78xx to #7Fxx (see [http://8bit.yarek.pl/upgrade/cpc.cpc4mb/index.html CPC4MB] Page, for futher details).* the expansion connects to the PAL inside the 6128.* all configuration codes are supported (0-7) and work exactly as they do in a 6128.* I/O port decoding is: 0xxxxbbbxxxxxxxx (confirmed by TFM) where bbb are 3 bits of the bank. The other 3 bits are from the data decoded as 11bbbccc and ccc the configuration code. Yarek's site recommends that bits A14,A13,A12,A10 are set to 1 to avoid conflict with other hardware. == Software == * Currently, CPC4MB is supported by [[FutureOS]] version .8 or higher* The 4 MB E-RAM Test: [[Media:E-RAM_Test_2014.zip]]* [[A Tribute to the Sisters|Giana Sisters Remake]]* [[Captain Future|Captain Future Video Demo]]* The first MB of the 4 MB expansion (&7Fxx, &7Exx) is supported by [[SymbOS]] version 2, but buggy. == Schematics == Altrough CPC4MB can be ordered fully assembled (even with mounting on a CPCboard), there's still a download of PCB design on CPC4MB page, if you want to DIY.
== Links ==
* [http://8bit.yarek.pl/upgrade/cpc.cpc4mb/index.html CPC4MB]
* [http://8bit.yarek.pl/upgrade/cpc.cpc4mb/cpc4mb1.zip PCB Layouts in Eagle format]
See also the [[:Category:Memory expansions|list of memory expansions for the CPC]]
[[Category:4 MB RAM Software Support]] [[Category:DIY]] [[Category:FutureOS]] [[Category:Hardware]] [[Category:Memory expansions]] [[Category:Peripherals]]