Changes
== Technical Specifications ==
Could take memory configurations of Dram types [[4164]] to [[41256]], thus making memory configurations between 64Kb and 512Kb possible.
A15== Other memory expansions ==0 with all other address bits can be any value.(Use 7fxx for compatibility)
* For the I/O Ports, see [[SYMBiFACE IIStandard Memory Expansions]].
Dobbertin supplied [[Vortex SP 64 - SP 512RDOS]]as a optional ROM to use the memory expansion as RAM disc with 444 KB free. They also supplied CP/M 2.2 and Plus with full support of the RAM disc. Other software using this RAM expansion: [[Discology]], Xexor, [[Cosmos]], [[On File]], [[Punishment]], [[Disc'o'Magic]], [[Pyradev]], Alyssa Database, [[CPC Word]], [[FutureOS]] and [[ParaDOS]]. Arnor software like Prowort ([[Protext]]) and [[MAXAM]] II also support the usage of the RAM disc.
== Photos Pictures ==
<gallery caption="The Dobbertin ram expansion">
Image:Dobbertin ram 2.jpg|Inside here a version with the optional two roms mounted.
Image:Dobbertin ram 1.jpg|Inside top view
Image:Dobbertin ram 1a.jpg|
Image:Dobbertin ram 2a.jpg|
Image:Dobbertin_512Kb_Top.jpg|Unit Top
Image:Dobbertin_512Kb_Bottom.jpg|Unit Bottom
Image:Dobbertin_512Kb_PCB_Top.jpg|PCB Top
Image:Dobbertin_512Kb_PCB_Bottom.jpg|PCB Bottom
</gallery>
[[Category:Peripherals]] [[Category:Memory expansions]]
