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PostPosted: Wed Apr 03, 2019 5:19 pm 

Joined: Sun Sep 19, 2004 11:12 pm
Posts: 21559
Location: NE Indiana, USA (NTSC)
Say I wanted to make a multicart of two 24 Mbit (3 MiB) HiROM games, and I wanted to test the menu that I'm developing in an emulator before I commit to building the hardware. I'd need probably some sort of latch outputting on A22, analogous to what BNROM has. Do any well-known emulators support anything similar to this? And if so, how is the presence of this latch reflected to the emulator?

The last few times I made multicart menus on NES, I was able to handle all the work myself because I was piggybacking on existing discrete mappers or low-end ASICs. These included Forbidden Four on MMC1, Midwest Gaming Classic 2011 on UNROM (Crazy Climber version), and Action 53 originally on BNROM. But it might be a bit harder on Super NES because nothing really used mappers outside coprocessor games.

I might even willing to pay someone to put support for this into Mesen-S or bsnes-plus.

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PostPosted: Wed Apr 03, 2019 6:34 pm 

Joined: Sun Apr 13, 2008 11:12 am
Posts: 8533
Location: Seattle
I wrote a multicart system without testing the multicart part in emulation. It's not like it's doing interbank calls; if anything's broken it'll be very obvious from the outset.

PostPosted: Thu Apr 04, 2019 12:24 am 

Joined: Tue Oct 06, 2015 10:16 am
Posts: 965
I could do the job for bsnes-plus, but I won't be free until 2-3 weeks later. Perhaps others will be available sooner.

PostPosted: Sun Apr 07, 2019 4:26 pm 
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Joined: Mon Sep 05, 2011 5:56 pm
Posts: 295
Multicart need a mmc, I think it's easy to support in emulator,but not support now,
because it's the homebrew mmc.

I have made a 2Gbit multicart.emulator only support show menu(if no homebrew mmc inculde in emulator).

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