The VT09 variant of the OneBus-type Famiclones has 4 KiB instead of 2 KiB of main CPU RAM at offset $0000 in CPU memory. FCEUX apparently uses mapper 256 for OneBus, and I intend to follow that precedent. In the NES 2.0 format, should this additional RAM be denoted as a submapper or as 2 KiB PRG-RAM, even though this additional RAM is part of the main unit (or rather part of the main chip) and not the game? Some OneBus images of course have the normal 8 KiB of WRAM at $6000, so if one went for the PRG-RAM field, the PRG-RAM size would then implicitly determine its offset as well, which seems kind of hacky to me. Given that several OneBus images are multicarts consisting of NES-era games that may depend on RAM being mirrored four times in the $0000-$1FFF range, just always emulating the additional 2 KiB does not seem safe.
Opinions?
VT09 RAM
Moderator: Moderators
Re: VT09 RAM
Most of the fields in the NES2.0 header are describing properties of the cartridge, not the console. And if you use the RAM size field here to describe the console, there's no space to describe the cartridge.
Re: VT09 RAM
The VS system and PAL region flags describe the console, and not the game.
Here come the fortune cookies! Here come the fortune cookies! They're wearing paper hats!
Re: VT09 RAM
Yes. If there are unused bits in those section, then maybe use some of those if necessary?Dwedit wrote:The VS system and PAL region flags describe the console, and not the game.
(Free Hero Mesh - FOSS puzzle game engine)
-
- Posts: 70
- Joined: Sat Feb 01, 2020 5:49 am
Re: VT09 RAM
but when i try to play an VT03 or VT09 game such as: Access Block or Bubble Blaster in FCEUX, then the game won't work.NewRisingSun wrote: ↑Wed Nov 22, 2017 5:13 am The VT09 variant of the OneBus-type Famiclones has 4 KiB instead of 2 KiB of main CPU RAM at offset $0000 in CPU memory. FCEUX apparently uses mapper 256 for OneBus, and I intend to follow that precedent. In the NES 2.0 format, should this additional RAM be denoted as a submapper or as 2 KiB PRG-RAM, even though this additional RAM is part of the main unit (or rather part of the main chip) and not the game? Some OneBus images of course have the normal 8 KiB of WRAM at $6000, so if one went for the PRG-RAM field, the PRG-RAM size would then implicitly determine its offset as well, which seems kind of hacky to me. Given that several OneBus images are multicarts consisting of NES-era games that may depend on RAM being mirrored four times in the $0000-$1FFF range, just always emulating the additional 2 KiB does not seem safe.
may i get some advice on how to make the games work on FCEUX?
Re: VT09 RAM
Might I suggest finding a VT03/VT09 emulator rather than using an NES emulator?
Also, did you really need to resurrect a 3+ year-old thread rather than posting in the VTxx thread you already made?
Also, did you really need to resurrect a 3+ year-old thread rather than posting in the VTxx thread you already made?
Quietust, QMT Productions
P.S. If you don't get this note, let me know and I'll write you another.
P.S. If you don't get this note, let me know and I'll write you another.
-
- Posts: 70
- Joined: Sat Feb 01, 2020 5:49 am
Re: VT09 RAM
sadly, there is no VT03 Emulator for Retrofw or the Miyoo CFW, whereas FCEUX is the one, who got ported to both of those systems.