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16k cartridge mappings


jum

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I've recently been modding a "Pixels Past" 32k 5200 cartridge PCB to be able to switch between 2 16k rom images in the 32k EPROM, using an external switch.

 

This setup assumes that the 16k rom is mapped to 0x8000 in the 5200 memory space.

 

However I noticed that many 16k roms seem to be mapped to 0x6000, and then the last 8k of the rom is repeated at 0xA000.

 

(I also noticed this when writing the Jum52 5200 emulator)

 

What I'm curious about is why this was done? Was it maybe some kind of anti-piracy mechanism, to make it harder to copy the cartridge?

 

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