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Dobbertin Memory Expansion

374 bytes added, 09:09, 22 June 2016
/* Technical Specifications */
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]].
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