NES 2.0 submappers
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- rainwarrior
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Re: NES 2.0 submappers
Here is my alternative proposal for VRC2/VRC4 submapper assignment: Wiki: VRC2 / VRC4 alternative submapper assignment
It reserves exactly 4 assignments per board. 2 for the addressing scheme x 2 for VRC2/VRC4. This covers everything that exists and provides a space for any future undiscovered VRC2 on those boards.
I don't see the point of allocating any other addressing schemes, since those wouldn't be related to the underlying iNES mapper anyway. A new addressing scheme should get a new mapper allocation, not a submapper on an existing one.
It reserves exactly 4 assignments per board. 2 for the addressing scheme x 2 for VRC2/VRC4. This covers everything that exists and provides a space for any future undiscovered VRC2 on those boards.
I don't see the point of allocating any other addressing schemes, since those wouldn't be related to the underlying iNES mapper anyway. A new addressing scheme should get a new mapper allocation, not a submapper on an existing one.
Last edited by rainwarrior on Sat Aug 15, 2015 12:22 pm, edited 1 time in total.
Re: NES 2.0 submappers
Somehow I'd gotten the impression that VRC4 was kevtris's doing, not tepples's. Nonetheless, kevtris did give his thumbs up for it. I am definitely happier not having allocated all fifteen submappers, but we'll need to notify and/or push a patch to the people who have already implemented the loquacious version.
Anyway, I should go ahead and finish that VRC2/4 validation test ROM set, because I've wanted one for a while.
Anyway, I should go ahead and finish that VRC2/4 validation test ROM set, because I've wanted one for a while.
- rainwarrior
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Re: NES 2.0 submappers
This appears to be MESS and Nestopia UE.lidnariq wrote:we'll need to notify and/or push a patch to the people who have already implemented the loquacious version.
From what I can gather from open source searches:
- MESS implements "everything", more or less
- Nestopia UE implements three submappers (MMC6 004:1, and both VRC2 submappers)
- Bizhawk reads but doesn't use the submapper field
- Nintendulator reads but doesn't use the submapper field
- FCEUX reads but doesn't use the submapper field
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Re: NES 2.0 submappers
I'd like to suggest BNROM get its own submapper value. NINA has its own, and submapper 0 can the compatibility implementation. This is similar to how VRC2c gets its own submapper without a strict test program, by virtue of the hardware existing.
- rainwarrior
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Re: NES 2.0 submappers
Yeah, there's a proposal already for mapper 34, since it was already in kevtris' spec anyway. I added a BNROM solo to the proposal. It just needs test ROMs, really.
Re: NES 2.0 submappers
Since there seems to be a desire for validation tests, here's one for SEROM/SHROM/SH1ROM:
- Attachments
-
- serom.zip
- (8.62 KiB) Downloaded 2471 times
- rainwarrior
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Re: NES 2.0 submappers
Here's two test ROMs for mapper 34.
34_test_1.nes
expected results
CHR RAM: NO
PRG RAM: YES
PRG BANKS: $2
CHR BANKS $10
SUBMAPPER: $1
(NINA-001 exclusive)
34_test_2.nes
expected results
CHR RAM: YES
PRG RAM: YES
PRG BANKS: $8
CHR BANKS $1
SUBMAPPER: $2
(BNROM exclusive)
- Attachments
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- 34_test_src.zip
- mapper 34 submapper test source
- (16.45 KiB) Downloaded 1859 times
Last edited by rainwarrior on Thu Mar 21, 2019 4:47 pm, edited 1 time in total.
Re: NES 2.0 submappers
Famicom AV + InviteNES flashcart.


lidnariq wrote:Since there seems to be a desire for validation tests, here's one for SEROM/SHROM/SH1ROM:

rainwarrior wrote:Here's two test ROMs for mapper 34.
http://rainwarrior.ca/projects/nes/34_test_1.nes
http://rainwarrior.ca/projects/nes/34_test_2.nes


- rainwarrior
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Re: NES 2.0 submappers
Your InviteNES appears to be crashing during the BNROM bus conflicts test (see test_bbus in the source code). My guess is that it produces the bus conflicts, but doesn't properly mask the ROM address to match the size of the ROM available, so STA to a location containing $FF switches to some out-of-ROM bank and it crashes? It didn't even detect any bankswitching in the previous test, though, so... ? Does it even run any BNROM games, or the NINA-001 game?
Re: NES 2.0 submappers
It runs Impossible Mission 2.
- rainwarrior
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Re: NES 2.0 submappers
Here's test ROMs for the proposed mapper 3 submappers. (i.e. CNROM-like, with or without bus conflicts)
edit: fixed ordering of submappers 1/23_test_0.nes
expected results
PRG RAM: NO
CHR BANKS: $04
03 VS 00: (unknown)
00 VS FF: (unknown)
03 VS 01: (unknown)
03 VS 02: (unknown)
BUS CONFLICS: (unknown)
SUBMAPPER DETECTED: (unknown)
3_test_1.nes
expected results
PRG RAM: NO
CHR BANKS: $04
03 VS 00: $03
00 VS FF: $00
03 VS 01: $03
03 VS 02: $03
BUS CONFLICS: NONE
SUBMAPPER DETECTED: $01
3_test_2.nes
expected results
PRG RAM: NO
CHR BANKS: $04
03 VS 00: $00
00 VS FF: $00
03 VS 01: $01
03 VS 02: $02
BUS CONFLICS: AND
SUBMAPPER DETECTED: $02
- Attachments
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- 3_test_src.zip
- mapper 3 submapper test source
- (10.29 KiB) Downloaded 1818 times
Last edited by rainwarrior on Thu Mar 21, 2019 4:22 pm, edited 3 times in total.
Re: NES 2.0 submappers
Did you mean to reverse submappers 1 and 2?
- rainwarrior
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Re: NES 2.0 submappers
Sorry, I don't know why I didn't double check that. :S I will correct this shortly. (Edit: fixed now, I hope)
- rainwarrior
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Re: NES 2.0 submappers
Finally got around to test roms for the other two bus conflict submappers:
2_test_0.nes
expected results
PRG BANKS: $10
0F VS 00: (unknown)
00 VS FF: (unknown)
0F VS 01: (unknown)
0F VS 02: (unknown)
BUS CONFLICS: (unknown)
SUBMAPPER DETECTED: (unknown)
2_test_1.nes
expected results
PRG BANKS: $10
0F VS 00: $0F
00 VS FF: $00
0F VS 01: $0F
0F VS 02: $0F
BUS CONFLICS: NONE
SUBMAPPER DETECTED: $01
2_test_2.nes
expected results
PRG BANKS: $10
0F VS 00: $00
00 VS FF: $00
0F VS 01: $01
0F VS 02: $02
BUS CONFLICS: AND
SUBMAPPER DETECTED: $02
7_test_0.nes
expected results
PRG BANKS: $08
07 VS 00: (unknown)
00 VS FF: (unknown)
07 VS 01: (unknown)
07 VS 02: (unknown)
BUS CONFLICS: (unknown)
SUBMAPPER DETECTED: (unknown)
7_test_1.nes
expected results
PRG BANKS: $08
07 VS 00: $07
00 VS FF: $00
07 VS 01: $07
07 VS 02: $07
BUS CONFLICS: NONE
SUBMAPPER DETECTED: $01
7_test_2.nes
expected results
PRG BANKS: $08
07 VS 00: $00
00 VS FF: $00
07 VS 01: $01
07 VS 02: $02
BUS CONFLICS: AND
SUBMAPPER DETECTED: $02
- Attachments
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- 7_test_src.zip
- mapper 7 submapper test source
- (28.91 KiB) Downloaded 1832 times
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- 2_test_src.zip
- mapper 2 submapper test source
- (12.7 KiB) Downloaded 1848 times