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Mapping memory, diferent Modes

 
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Olorin113



Joined: 02 Jul 2008
Posts: 2

PostPosted: Wed Jul 02, 2008 4:49 pm    Post subject: Mapping memory, diferent Modes Reply with quote

Hello

I start to program on snes, in assembler , and I have a question about mapping memory. Very Happy

I noticed lowRom is use in mode 20, and HiRom in mode 21 (in "Sne dev manual").

I would like to know, how to use mode 25 for have a memory of 63Mb?
And what is Rom type? Confused

Thanks in advance Razz

Olorin Smile
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kyuusaku



Joined: 26 Jul 2003
Posts: 941
Location: .ma.us

PostPosted: Wed Jul 02, 2008 5:33 pm    Post subject: Reply with quote

What do you mean about the ROM type?

In software you just use C0-FF:0000-FFFF & 00-7D:8000-FFFF. Where in the ROM this gets mapped depends on the game cartridge.

In hardware, you can follow this guide: http://snesdev.romhack.de/tales_diagram.png
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Olorin113



Joined: 02 Jul 2008
Posts: 2

PostPosted: Thu Jul 03, 2008 5:21 am    Post subject: Reply with quote

I mean, the model of rom.

For example, the model of rom tototek use for the snes linker, it's a rom of 64Mb no?
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kyuusaku



Joined: 26 Jul 2003
Posts: 941
Location: .ma.us

PostPosted: Thu Jul 03, 2008 3:24 pm    Post subject: Reply with quote

I still don't understand. Do you mean how to wire the ROM to the SNES connector? For HiROM (and Mode 25 I believe) just connect SNES A0-A22 to ROM A0-A22, for LoROM connect SNES A0-14 to ROM A0-14 directly, but connect SNES A16-22 to ROM A15-21.

Yes, the flash cards ROM is a 64M flashROM, there are different models by different manufacturers though. If you want to write to it, you'll have to look at the datasheet.
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marvinsaint



Joined: 26 Apr 2010
Posts: 5

PostPosted: Mon Apr 26, 2010 2:49 pm    Post subject: Re: Mapping memory, diferent Modes Reply with quote

Olorin113 wrote:
Hello

I start to program on snes, in assembler , and I have a question about mapping memory. Very Happy

I noticed lowRom is use in mode 20, and HiRom in mode 21 (in "Sne dev manual").

I would like to know, how to use mode 25 for have a memory of 63Mb?
And what is Rom type? Confused

Thanks in advance Razz

Olorin Smile


Do you want make a bank switch or use more adress for conect more memory?
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