Search found 155 matches
- Thu Sep 07, 2023 2:32 am
- Forum: NESdev
- Topic: Seeking Ricoh/Nintendo Japanese Famicom Documents
- Replies: 3
- Views: 1510
Re: Seeking Ricoh/Nintendo Japanese Famicom Documents
Also check this out, I restored some of the block diagrams: viewtopic.php?t=24367
- Thu Sep 07, 2023 2:26 am
- Forum: NESemdev
- Topic: CPU emulation method?
- Replies: 16
- Views: 3267
Re: CPU emulation method?
Dynamic recompilation as applied to the 6502 doesn't work very well because between instruction executions it usually requires precise synchronization with APU/PPU execution. And recompilation implies code optimization of some sort. Besides that, you need to make friends with the mappers somehow. An...
- Wed Jul 26, 2023 11:54 pm
- Forum: Newbie Help Center
- Topic: Understanding APU Emulation
- Replies: 11
- Views: 2486
Re: Understanding APU Emulation
Before you understand how to emulate APU, you first need to understand how APU itself works.
The first thing that comes to mind is nesdev wiki: https://www.nesdev.org/wiki/APU
The first thing that comes to mind is nesdev wiki: https://www.nesdev.org/wiki/APU
- Sat Jun 24, 2023 11:36 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Sharp MMC1 Reverse Engineered
- Replies: 9
- Views: 1366
- Tue Jun 13, 2023 2:55 am
- Forum: NES Hardware and Flash Equipment
- Topic: Sharp MMC1 Reverse Engineered
- Replies: 9
- Views: 1366
Re: Sharp MMC1A Reverse Engineered
Fixed a small inaccuracy: the dffre cell is actually dffrs (set used during MMC1 reset).
https://github.com/emu-russia/mappers/b ... s.md#dffrs
Updated waves for MMC1 reset.
https://github.com/emu-russia/mappers/b ... s.md#dffrs
Updated waves for MMC1 reset.
- Sun Jun 11, 2023 3:02 am
- Forum: NES Hardware and Flash Equipment
- Topic: Sharp MMC1 Reverse Engineered
- Replies: 9
- Views: 1366
Re: Sharp MMC1A Reverse Engineered
Shift register is never reset. The divider that runs in parallel with the shift register and is responsible for turning on the register decoder is reset. The description on the nesdev wiki does not take this pecularity into account.
- Sat Jun 10, 2023 11:29 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Sharp MMC1 Reverse Engineered
- Replies: 9
- Views: 1366
Re: Sharp MMC1A Reverse Engineered
I have added a test bench so that you can do your own experiments.Can we find out exactly how this works
https://github.com/emu-russia/mappers/t ... MC1/icarus
As for the ignored-second-write, I am attaching the waves.
- Sat Jun 10, 2023 10:04 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Sharp MMC1 Reverse Engineered
- Replies: 9
- Views: 1366
Re: Sharp MMC1A Reverse Engineered
Logisim adaptation made by andkorzh
- Thu Jun 08, 2023 7:53 am
- Forum: NES Hardware and Flash Equipment
- Topic: Sharp MMC1 Reverse Engineered
- Replies: 9
- Views: 1366
Sharp MMC1 Reverse Engineered
Hello.
MMC1 circuit reconstruction completed:
https://github.com/emu-russia/mappers/tree/main/MMC1
All the materials are there, including the topology and cell layout, as well as an automatically restored Verilog netlist.
MMC1 circuit reconstruction completed:
https://github.com/emu-russia/mappers/tree/main/MMC1
All the materials are there, including the topology and cell layout, as well as an automatically restored Verilog netlist.
- Mon Jun 05, 2023 11:58 am
- Forum: NES Hardware and Flash Equipment
- Topic: Famiclone Chips Museum
- Replies: 9
- Views: 2206
Re: Famiclone Chips Museum
UM6582 (Dendy Turbo Controller): https://drive.google.com/drive/u/0/fold ... ZbEzDA0WvN
- Mon Jun 05, 2023 11:57 am
- Forum: NES Hardware and Flash Equipment
- Topic: Mapper Decap Project
- Replies: 35
- Views: 4989
- Mon Jun 05, 2023 11:56 am
- Forum: NES Hardware and Flash Equipment
- Topic: Mapper Decap Project
- Replies: 35
- Views: 4989
- Sun May 21, 2023 12:26 pm
- Forum: NESemdev
- Topic: Proof of Concept - NES/Famicom emulator at the signal and logic circuit level
- Replies: 1
- Views: 1597
Re: Proof of Concept - NES/Famicom emulator at the signal and logic circuit level
2.0 released:
https://github.com/emu-russia/breaknes/ ... reaknes-20
In the settings, you can enable audio and video dump, I think this can be useful.
https://github.com/emu-russia/breaknes/ ... reaknes-20
In the settings, you can enable audio and video dump, I think this can be useful.
- Mon May 15, 2023 1:02 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Famiclone Chips Museum
- Replies: 9
- Views: 2206
Re: Famiclone Chips Museum
Two NOACs are under the microscope today: the SUBOR SB-225 and the LIKO KL-235. In SUBOR, as it is stated on the motherboard, it turned out to be a banal 6561. But the LIKO has some kind of a weird thing: PA3088. We have never seen this before. SUBOR: https://drive.google.com/drive/u/0/folders/1-dU1...
- Mon May 15, 2023 10:21 am
- Forum: NES Hardware and Flash Equipment
- Topic: SUBOR/LIKO PCB Scans
- Replies: 1
- Views: 441
SUBOR/LIKO PCB Scans
Hi, I got a couple of popular famiclones in their time and photographed them with all the intimate details. SUBOR SB-225: https://drive.google.com/drive/u/0/folders/1-dU1ms39lwgdhIRu-1aOky4SJVKpEdXv LIKO KL-235: https://drive.google.com/drive/u/0/folders/1WOwd5iLHsX1CNpe-cHQfnRZPCYn2tplp According t...