Re[2]: [cc65] NES Support

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From: groepaz (
Date: 2002-02-05 15:47:09

Hello Mark,

Tuesday, February 05, 2002, 3:38:37 PM, you wrote:

KM> Hi,
>> Yes, but on the C64, you'd probably use such 
>> cartridges as "ROM disks", to port a floppy-based 
>> game to cartridge.  Typically, 8 or 16 kilobytes
>> would be mapped in the address space at a time.

KM> Same with the Atari, typically a fixed block 
KM> between $A000 and $BFFF (8K) and then switch
KM> in block by bank # into $8000 -> $9FFF.

KM> What you do with the bank, ie. copy it to RAM
KM> I supposed does make it a kinda ROM disk.

KM> The NES models were far more flexible, e.g. 
fixed 16K at $C000->>$FFFF and then switch 
blocks into $8000->>$BFFF, and that's just for code!

wow that config looks alot like the gameboy :o)

on the c64 you may map 8k rom each to 3 different locations in the
memory map.... that is $8000-$9fff, $a000->$bfff, $e000-$efff
...additionaly there is ram in the entire $0000-$ffff space

Best regards,

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