The Amiga supports several ROM\/Kickstart “banks”; The original A1000 bank is a 256k chunk starting at $FC0000, this was used right up until the first kickstart 1.4 (alpha), then there was a move to use 512k kickstarts starting earlier at $F80000 (an extra 256k)<\/p>\n\n\n\n
The CDTV was an exception as it uses $F00000 for its extended ROM, these are separate physical ROMs (the CD32 also uses $200000 for the VCD\/FMV\/mpeg CD32 ROM).<\/p>\n\n\n\n
This was pretty much the same until the CD32 which has a 1Mb kickstart, or, more correctly an original 512k kickstart at $F80000 and an extended kickstart at $E00000.<\/p>\n\n\n\n
The A500+\/A600\/A1200\/CD32 are all (electrically) capable of addressing a further 1Mb of space at $A80000 without any hardware modifications.<\/p>\n\n\n\n
256k Kickstart\n0xFC0000 - 0xFFFFFF 256k chunk<\/strong><\/code><\/pre>\n\n\n\n512k Kickstart\n0xF80000 - 0xFFFFFF 512k chunk, overlaps the 256k chunk, but starts earlier<\/strong><\/code><\/pre>\n\n\n\n1Mb Kickstart\n0xF80000 - 0xFFFFFF 512k chunk\n0xE00000 - 0xE7FFFF 512k chunk<\/strong><\/code><\/pre>\n\n\n\n2Mb Kickstart\n0xF80000 - 0xFFFFFF 512k chunk\n0xE00000 - 0xE7FFFF 512k chunk\n0xA80000 - 0xB7FFFF 1Mb chunk\nNote, these banks are not contiguous.<\/strong><\/code><\/pre>\n\n\n\nROMs can also be “softloaded” via relocation into different chunks of memory like 0xC00000\/0x200000 via KickIt\/ReKick\/Degrader\/RelocKick\/skick\/mkick etc. if you have some spare memory here’
The CD32 FMV ROM is a little bit of an anomaly, it’s technically an “expansion ROM”, which normally uses a different method for addressing, usually being mapped to a different address (therefore would normally be fully relocatable), however in the CD32, it always appears at a fixed $200000 address and apart from the initial autoconfig bootstrap, it uses normal kickstart style components (libraries) and it’s own ROM scanning – using a standard 0x4AFC MATCHWORD (which isn’t automatically relocatable), the libraries use lots of fixed addresses in the 0x200000-0x23FFFF range (256k ROM).<\/p>\n\n\n\n
There are also other areas used for loading additional ROMs, expansion ROMs can appear at $E80000 (and maybe $E90000), but they get copied from there (there’s also the ZorroIII address $FF000000, but I’ll ignore 32bit addresses here for now).<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
The Amiga supports several ROM\/Kickstart “banks”; The original A1000 bank is a 256k chunk starting at $FC0000, this was used right up until the first kickstart 1.4 (alpha), then there was a move to use 512k kickstarts starting earlier at $F80000 (an extra 256k) The CDTV was an exception as it uses $F00000 for its …<\/p>\n