Search found 101 matches

by aquasnake
Sat Jun 20, 2020 6:38 am
Forum: Reproduction
Topic: SNES game PCB cartridge with chip vs battery to save
Replies: 10
Views: 827

Re: SNES game PCB cartridge with chip vs battery to save

FM18W08 unit price: qty 1 28$, qty 1000 19$. Yikes, the only way those chinese can afford to put them in snes repros if they can pull them for free from some junked equipment. a part of cantonese did so: a certain number of countries transported electronic junk to china, a certain number of people ...
by aquasnake
Sat Jun 20, 2020 6:08 am
Forum: Reproduction
Topic: SNES game PCB cartridge with chip vs battery to save
Replies: 10
Views: 827

Re: SNES game PCB cartridge with chip vs battery to save

recycled FRAM and Flash ROM
by aquasnake
Sat May 16, 2020 4:34 am
Forum: NES Hardware and Flash Equipment
Topic: Green Beret FDS port
Replies: 1
Views: 496

Re: Green Beret FDS port

Mario Baby

KS018/AC08/LH09 Green Beret

actually these 2 mappers do not have the same behavior.




http://forums.nesdev.com/viewtopic.php? ... 19#p243719
by aquasnake
Fri May 15, 2020 9:19 pm
Forum: NES Hardware and Flash Equipment
Topic: MMC1 free implementation on CPLD released
Replies: 34
Views: 10696

Re: MMC1 free implementation on CPLD released

coolboy costs some registers at $500x or $600x to set a lot of parameters which would be used by the menu loader. the disadvantage is more logic elements have been taken. and the advantage is chr-data are also stored in prg-rom, danamically copied to chr-ram by menu loader. so dont need to seprate n...
by aquasnake
Thu May 14, 2020 7:06 pm
Forum: NES Hardware and Flash Equipment
Topic: MMC1 free implementation on CPLD released
Replies: 34
Views: 10696

Re: MMC1 free implementation on CPLD released

full functional MMC1 will take almost 100 LEs:
mmc1.png
mmc1.png (6.31 KiB) Viewed 814 times
and the slim or customized MMC1 could be reduced to 72 LEs.
by aquasnake
Tue May 12, 2020 7:27 pm
Forum: NES Hardware and Flash Equipment
Topic: Fixing Chinese SMB2J
Replies: 14
Views: 14880

Re: Fixing Chinese SMB2J

I reviewed this issue again because the write cycle of wram is too fast (<55ns), we need delay WRAM_CS for decades of nano-second. it can be solved by connecting a 4.7nF capacitor to the vcc on the WRAM_CS line
by aquasnake
Mon May 11, 2020 8:02 am
Forum: NES Hardware and Flash Equipment
Topic: Multicart doesn't work on famicom
Replies: 12
Views: 1867

Re: Multicart doesn't work on famicom

1. Detect the contact between goldfinger and slot 2. Check the power supply system of the console Although the DIP chip card is very expensive in China, it is only suitable for collection, because some of the large number of DIP chip CARDS are on low voltage machines, the execution is problematic 1...
by aquasnake
Mon May 04, 2020 10:18 pm
Forum: NES Hardware and Flash Equipment
Topic: 4-screen mirroring in Gauntlet
Replies: 6
Views: 1482

Re: 4-screen mirroring in Gauntlet

2 modes

mode1: ciram_cs $2000-$27FF, cxram_cs $2800-2FFF
mode2: always disable ciram and connect /pa13 to cxram_cs
by aquasnake
Sun May 03, 2020 8:00 am
Forum: NES Hardware and Flash Equipment
Topic: about MMC5 ExRAM
Replies: 0
Views: 1530

about MMC5 ExRAM

here's my understanding
mmc5_exram_mode.png
it can be hardly emulated just by using a single cpld but not an fpga
by aquasnake
Fri Apr 10, 2020 9:12 pm
Forum: NES Hardware and Flash Equipment
Topic: Recca cart authenticity
Replies: 39
Views: 11191

Re: Recca cart authenticity

there's no way to get a genuine RECCA from ebay or aliexpress, 99% are all fakes.

the only way is to go to Japan personally
by aquasnake
Fri Apr 10, 2020 9:00 pm
Forum: NES Hardware and Flash Equipment
Topic: Recca cart authenticity
Replies: 39
Views: 11191

Re: Recca cart authenticity

another fake: fake TxROM.jpg if you thought this cart were genuine at the first glance, you are totally fooled. 1. the bus routings are not at equal spacing, espailly at the corner of them. 2. the corners of PCB routing are not curved. 3. still the pcb via(s), have no UV curable paint. 4. no stamp h...
by aquasnake
Tue Apr 07, 2020 4:59 am
Forum: NES Hardware and Flash Equipment
Topic: Forever DUO 852 Games of NES (405+447)
Replies: 14
Views: 2667

Re: Forever DUO 852 Games of NES (405+447)

this cart is distributed by Blazepro, which chinese name is "超技".
by aquasnake
Fri Apr 03, 2020 11:12 pm
Forum: NES Hardware and Flash Equipment
Topic: Forever DUO 852 Games of NES (405+447)
Replies: 14
Views: 2667

Re: Forever DUO 852 Games of NES (405+447)

due to the bit width of lower cpu address bus(a0, a1), i guess this is some variant/enhanced of mapper268.
by aquasnake
Sun Mar 29, 2020 7:47 am
Forum: NES Hardware and Flash Equipment
Topic: How can I dump 143in1 cartridge's savefiles with kazzo ?
Replies: 9
Views: 2010

Re: How can I dump 143in1 cartridge's savefiles with kazzo ?

without any diode, this cart can not sustain its sram data for one week
by aquasnake
Fri Mar 06, 2020 8:16 pm
Forum: NES Hardware and Flash Equipment
Topic: Building a 0 chip cartridge
Replies: 7
Views: 3742

Re: Building a 0 chip cartridge

the last 256K page needs to be mirrored to $FE00-$FEFF 256-byte suppose hardware reset never clears the internal RAM, the next steps might be meaningful: once the loader has finished copying code to ram, then set the mapper registers to map $FFFC-$FFFF to $6FC-$6FF, and never allow to write these r...