Search found 114 matches

by aquasnake
Thu Sep 24, 2020 11:09 am
Forum: NES Hardware and Flash Equipment
Topic: Interesting pirate PCB
Replies: 8
Views: 238

Re: Interesting pirate PCB

Do you know, with SRAM, you can put address lines and data lines in any order? :) ALWAYS you see special routing to keep them correct, nobody must realize it. not really, some kinds of MCP have 2 dies inside, and the highest address actually is the driving pin of CS. the CS pin's input delay is muc...
by aquasnake
Wed Sep 23, 2020 3:01 am
Forum: NES Hardware and Flash Equipment
Topic: the tricky pirate organization: NTDEC
Replies: 1
Views: 76

the tricky pirate organization: NTDEC

this team is totally an unlicensed organization as we know, but it looks like wanting to be an imitator of Nintendo.

you see: NTDEC = NinTenDo Entertainment Co.

:)
by aquasnake
Sat Sep 19, 2020 8:42 am
Forum: Reproduction
Topic: Almana no Kiseki FDS to MMC1 Repro Problem
Replies: 9
Views: 11822

Re: Almana no Kiseki FDS to MMC1 Repro Problem

there's a small glitch: when starting the game, wait 2 seconds and press select button to skip the opening, then noise appears, i tested on a real famicom and it still exists even though on fceux.
by aquasnake
Mon Sep 14, 2020 6:30 pm
Forum: NES Hardware and Flash Equipment
Topic: MMC3 on CPLD
Replies: 45
Views: 17838

Re: MMC3 on CPLD

the fully functional standard MMC3 cpld clone shall oocupy almost 128 macrocells, while the enhanced super MMC3 such as coolboy for multi-cart purpose will additionally increase 40 macrocells.
by aquasnake
Sun Sep 13, 2020 8:50 pm
Forum: Reproduction
Topic: FDS RAM Adapter - NES Version
Replies: 31
Views: 36033

Re: FDS RAM Adapter - NES Version

I remember playing with that FDS RAM adapter on a Famicom with CPU (UA6527P), PPU (UA6538) and crystal (26.601712MHz) replaced from a Dendy and it immediatelly hang out after showing the loading screen, so be prepared that it might not work on PAL console without modification of the FDS Bios. i tes...
by aquasnake
Wed Aug 26, 2020 9:04 pm
Forum: NESdev
Topic: Questions about NES programming and architecture
Replies: 143
Views: 10425

Re: Questions about NES programming and architecture

Secamline wrote:
Wed Aug 26, 2020 7:07 pm

I guess the BIOS contains the files selcetion and games' loading routines ontop of the fancy Mario and Luigi animation.
i really like this demo, its cute and funny, mario is chasing and luigi is escaping with the excellent AI programming.
by aquasnake
Wed Aug 26, 2020 7:35 pm
Forum: NESdev
Topic: Questions about NES programming and architecture
Replies: 143
Views: 10425

Re: Questions about NES programming and architecture

xram is used by mapper198(waixing - tun shi tian di) and mapper5. whatever call it external ram or extended ram, the fixed address space is $5xxx($5C00-$5FFF at mapper5). "EXRAM" here to name MMC5 intetnal 1KiB onchip SRAM, but can be used as either(never both) cxram or xram, by setting $5104. when ...
by aquasnake
Wed Aug 26, 2020 7:27 pm
Forum: NESdev
Topic: Questions about NES programming and architecture
Replies: 143
Views: 10425

Re: Questions about NES programming and architecture

[/quote] According my measurements the FDS disk takes between 6 and 7 seconds per access. However, as opposed to the PS1 CD, the head's position cannot be controlled, it can only be advanced, and when a mechanical "click" happens the whole disk is read from the start. [/quote] yes, mitsumi quick-dis...
by aquasnake
Tue Aug 25, 2020 11:36 pm
Forum: NESdev
Topic: Questions about NES programming and architecture
Replies: 143
Views: 10425

Re: Questions about NES programming and architecture

The WRAM label in the console is probably incorrect, it should simply read RAM. As far as I know WRAM is a term used for optional extra RAM on the cartridge typically at $6000-$7fff. At least when refering to terminology printed on Nintendo-made PCBs. Since NES-related terminology is almost always ...
by aquasnake
Tue Aug 25, 2020 10:21 pm
Forum: NESdev
Topic: Difficulty on making an FDS project?
Replies: 15
Views: 6593

Re: Difficulty on making an FDS project?

To keep the BIOS busy until the next NMI hits, I presume. /* PPU IO */ #define PPU_CTRL1 0x2000 #define PPU_CTRL2 0x2001 #define PPU_STATUS 0x2002 #define PPU_SPR_ADDR 0x2003 #define PPU_SPR_IO 0x2004 #define PPU_VRAM_SCRL 0x2005 #define PPU_VRAM_ADDR 0x2006 #define PPU_VRAM_IO 0x2007 #define PPU_S...
by aquasnake
Tue Jul 28, 2020 11:35 pm
Forum: NES Hardware and Flash Equipment
Topic: Kaiser chips KS204/KS203/KS202 + kaiser boards
Replies: 27
Views: 23786

Re: Kaiser chips KS204/KS203/KS202 + kaiser boards

puting two or more different packages of single chip together, its a design strategy to avoid the shortage of a certain component.
by aquasnake
Tue Jul 28, 2020 10:43 pm
Forum: NES Hardware and Flash Equipment
Topic: MMC5 carts and 8kb (6264) and 32kb (62256) SRAM chip support
Replies: 4
Views: 2672

Re: MMC5 carts and 8kb (6264) and 32kb (62256) SRAM chip support

mmc5 supports 2 srams at most, it has the ability to select one 32KB(sram0) or another 8KB(sram1). if exists sram1, sram0 and sram1 always be 8KB. -- not correct so the most accurate form is 32K+8K: write $5113 bit[1:0] to latch the inner sram0 bank. write $5113 bit[2] to latch the outer sram0/sram1...
by aquasnake
Fri Jul 10, 2020 1:13 pm
Forum: NES Hardware and Flash Equipment
Topic: Rolling video w/a particular game pak (The Immortal; TLROM).
Replies: 28
Views: 18548

Re: Rolling video w/a particular game pak (The Immortal; TLROM).

static const unsigned char gray_table[] = { 0x0F, // 0 black 0x1D, // 1 dark grey 0x2D, // 2 66 shades of gray 0x00, // 3 middle grey 0x10, // 4 33 shades of gray 0x3D, // 5 light gray 0x30, // 6 white 0x30 // 7 just for compatibility }; 0x0D is meaningless, do not assign 0x0D as some gray scale
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: 2351

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: 2351

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

recycled FRAM and Flash ROM