Optional two rom sockets. Each socket could be manually configured for rom 1-15
I/O port decoding is the same as Dk'tronics.
A15=0 with all other address bits can be any value.
(Use 7fxx for compatibility)
Dobbertin supports all ram configs (c4-ff) as expected.
But, on a 464 with ROMs enabled and config 3 (c3 etc) is chosen we see:
&0000-&3fff: base ram &0000-&3fff
&4000-&7fff: upper rom
&8000-&bfff: base ram &8000-&cfff
&c000-&ffff: upper rom
* For the I/O Ports, see [[Standard Memory Expansions]].
== Software ==
Dobbertin supplied [[RDOS]] 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]], [[Punishment]], [[Disc'o'Magic]], [[Pyradev]], Alyssa Database, [[CPC Word]], [[FutureOS]] and [[ParaDOS]]. Arnor software like Prowort ([[Protext]]) and Maxam [[MAXAM]] II also support the usage of the RAM disc.
== Pictures ==