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Re: The SNES WIP topic
etabeta78 #61086 04/12/10 05:59 AM
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byuu Offline
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Originally Posted by etabeta78
great! I was waiting for that since forever!!!!

Ah, should have asked me frown

Code
  if(mapper == LoROM) {
    xml << "  <rom>\n";
    xml << "    <map mode='linear' address='00-7f:8000-ffff'/>\n";
    xml << "    <map mode='linear' address='80-ff:8000-ffff'/>\n";
    xml << "  </rom>\n";

    if(ram_size > 0) {
      xml << "  <ram size='" << strhex(ram_size) << "'>\n";
      //20-3f|a0-bf probably isn't mapped, just being paranoid ...
      xml << "    <map mode='linear' address='20-3f:6000-7fff'/>\n";
      xml << "    <map mode='linear' address='a0-bf:6000-7fff'/>\n";
      if((rom_size > 0x200000) || (ram_size > 32 * 1024)) {
        xml << "    <map mode='linear' address='70-7f:0000-7fff'/>\n";
        xml << "    <map mode='linear' address='f0-ff:0000-7fff'/>\n";
      } else {
        xml << "    <map mode='linear' address='70-7f:0000-ffff'/>\n";
        xml << "    <map mode='linear' address='f0-ff:0000-ffff'/>\n";
      }
      xml << "  </ram>\n";
    }
  }

Note how when ROM size > 2MB or RAM size > 32KB, ROM is mapped to 70-7f|f0-ff:8000-ffff. This is required for Fire Emblem: Torakia 776, otherwise the graphics will be corrupted.

And when you have a ROM size <= 2MB and RAM size <= 32KB, you have to map RAM to 70-7f|f0-ff:8000-ffff. This is required to save your progress in Ys 3: Wanderers from Ys.

Thank Nach for that observation.
Re: The SNES WIP topic
byuu #61087 04/12/10 06:11 AM
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etabeta78 Offline
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I knew. if you remember, the first thing I asked to borrow from bsnes was the cart mapping code
but I never found a game requiring that specific part so I was always mapping the whole 70-7f:0000-ffff as SRAM (and, to be fair, I only remembered about this possible source of problems last week).

actually we are also diverging a bit more for SRAM (no "paranoid part" in MESS), but I might consider switching to your approach now that we have finally found issues due to SRAM mapping, and hence I have test cases...


EDIT: improved SRAM mapping for large LoROM carts. As a result, I was able to progress a bit in Tokimeki Memorial (still no text, but the game didn't freeze at the first selection...)

in a few days, when I'm back from a work trip, I'll try to make our SRAM handling the same as bsnes
Re: The SNES WIP topic
etabeta78 #61088 04/12/10 08:10 AM
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Quote
but I never found a game requiring that specific part so I was always mapping the whole 70-7f:0000-ffff as SRAM

Yeah, I tend to do most of these things for a reason wink
Please don't hesitate to ask if you are about to diverge on something. Never know, it may be a bug in my code.
Re: The SNES WIP topic
byuu #61089 04/12/10 08:15 AM
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etabeta78 Offline
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Originally Posted by byuu
Note how when ROM size > 2MB or RAM size > 32KB, ROM is mapped to 70-7f|f0-ff:8000-ffff. This is required for Fire Emblem: Torakia 776, otherwise the graphics will be corrupted.

And when you have a ROM size <= 2MB and RAM size <= 32KB, you have to map RAM to 70-7f|f0-ff:8000-ffff. This is required to save your progress in Ys 3: Wanderers from Ys.

Thank Nach for that observation.

while we are at this, byuu, I have a question about LinearMap of cartram (cartrom is understood).
Say a cart has 32k of SRAM, and we map it "linearly" in 64k (0x1000) of memory. what happens if a write occurs at 0xc00? does the cart save the value written there? and how, given it only have 32k of SRAM? or does the upper half (0x800-0x1000) become RAM (i.e. it gets written and read, but not saved at exit)?

this is the last missing bit to make our handling the same as yours...


EDIT: as you can see, I haven't hesitated wink
Re: The SNES WIP topic
Kale #61090 04/12/10 08:44 AM
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You can fix the text by fixing the
Code
snes_cart.small_sram == SNES_MODE_20
typo in snescart.c. wink
Re: The SNES WIP topic
jbo_85 #61091 04/12/10 08:52 AM
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etabeta78 Offline
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d'oh... I should not code while preparing my luggage...

thanks a lot: we finally have text in Tokimeki and Wizardry Gaiden starts :party:

Last edited by etabeta78; 04/12/10 08:53 AM.
Re: The SNES WIP topic
etabeta78 #61094 04/12/10 09:27 AM
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AWJ Offline
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Originally Posted by etabeta78
while we are at this, byuu, I have a question about LinearMap of cartram (cartrom is understood).
Say a cart has 32k of SRAM, and we map it "linearly" in 64k (0x1000) of memory. what happens if a write occurs at 0xc00? does the cart save the value written there? and how, given it only have 32k of SRAM? or does the upper half (0x800-0x1000) become RAM (i.e. it gets written and read, but not saved at exit)?

I would guess that it's most likely mirrored...
Re: The SNES WIP topic
AWJ #61095 04/12/10 09:35 AM
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I would expect the same, but I would like to know the exact behavior of byuu's MapLinear. because for mirroring the writes I would have expected something like (bogus example for our 64k at 0x70)

map(MapLinear, 0x70, 0x70, 0x0000, 0x0fff, memory::cartram, 0x0000, 0x07ff);

and I find in bsnes something like

map(MapLinear, 0x70, 0x70, 0x0000, 0x0fff, memory::cartram);

with no mention of the behavior of writes to mirrored addresses (the last 2 parameters are used to say the program to ignore higher bits...)
Re: The SNES WIP topic
etabeta78 #61104 04/12/10 01:23 PM
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Uhm ...

[Linked Image from mamedev.emulab.it]

[Linked Image from mamedev.emulab.it]

[Linked Image from mamedev.emulab.it]

[Linked Image from mamedev.emulab.it]

Fushigi no Dungeon 2 garbage on ranking screen is gone, but game still doesn't save properly.

EDIT: just fixed laugh

[Linked Image from mamedev.emulab.it]

Last edited by Kale; 04/12/10 01:39 PM.
Re: The SNES WIP topic
Kale #61105 04/12/10 02:22 PM
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Great work smile

Tokimeki graphics are not quite 100% in-game though:
[Linked Image from interbutt.com]
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