nesdev.com

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...

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.

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.

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.

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...

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.

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 ...

[/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...

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 ...

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...

puting two or more different packages of single chip together, its a design strategy to avoid the shortage of a certain component.

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...

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

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 ...

recycled FRAM and Flash ROM