Search found 155 matches

by aquasnake
Tue Dec 01, 2020 2:29 am
Forum: NES Hardware and Flash Equipment
Topic: Reset based multicart cartridge issues
Replies: 2
Views: 132

Re: Reset based multicart cartridge issues

If the multi-cart is less than four in one, it can allow the counter to trigger multiple times (of course, it must not trigger the exponential power of 2 every time. If different reset results in different odd or even number oscillation, it seems to be acceptable). This shows that a certain game is ...
by aquasnake
Mon Nov 30, 2020 11:29 pm
Forum: NES Hardware and Flash Equipment
Topic: Oversize FDS disk images
Replies: 40
Views: 33844

Re: Oversize FDS disk images

FDS has 65500 bytes of data per disk side, which is a constant and is defined specifically for FDS. For "game doctor", only one parameter needs to be modified: side_ end = (side_ offset == 65499); In this way, you have to redefine file suffixes for this disk format and do not need to be compatible. ...
by aquasnake
Sat Nov 28, 2020 6:55 pm
Forum: Reproduction
Topic: Dragon Ball - Shen Long no Nazo English Translation
Replies: 8
Views: 258

Re: Dragon Ball - Shen Long no Nazo English Translation

This board was originally axrom. If you want to write to gxrom, the mirror mode can only be vertical or horizontal, so this board is not applicable.

You need to weld additional flying wires, connecting A10 or a11 to ciram-a10
by aquasnake
Thu Nov 26, 2020 6:11 pm
Forum: NESdev
Topic: New, homebrew mapper
Replies: 16
Views: 7496

Re: New, homebrew mapper

I'm cautious about homebrew mapper, because create a new mapper, unless you really can't find another mapper that can do the same thing. Sometimes, the existing mapper already meets the demand, and I just need to expand it a little, such as adding the address line of outer PRG bank. Sometimes it is ...
by aquasnake
Wed Nov 25, 2020 8:57 am
Forum: NES Hardware and Flash Equipment
Topic: Gryzor - interesting bootleg
Replies: 33
Views: 16104

Re: Gryzor - interesting bootleg

yes,this cart rom working 23 CRC: 295EFA08 SHA-1: 8F4202AEACC78877DD69718EE184096CC6C7F881 System: NES-NTSC Board: KONAMI VRC2/Mapper 23, Mapper 23 PRG-ROM: 128k CHR-ROM: 128k W-RAM: 8k Solder Pad: H:0 V:1 Dump: Unknown contra (ks-7049)_001.png 类似的卡带应该还有双截龙2 MAPPER 127 (但我一直没有找到这个ROM或卡带) this cart ...
by aquasnake
Tue Nov 24, 2020 10:45 pm
Forum: NESdev
Topic: FDS homebrew ?
Replies: 39
Views: 13741

Re: KYODAKU (256 bytes)

This post in November 2020 ten years later brought this old topic to mind, and I wanted to make readers who find this topic through search aware of subsequent developments as well as explore one (admittedly academic) option I had missed at the time. Nintendo were careful, and all these workarounds ...
by aquasnake
Tue Nov 24, 2020 5:40 pm
Forum: NESdev
Topic: What are ROM Nametables useful for?
Replies: 4
Views: 286

Re: What are ROM Nametables useful for?

The significance of mapping ntrom to ciram is that it can display graphics quickly without waiting to write to ciram After all, the hardware remapping is much faster than the software operation of $2006-$2007 loops. This technique is usually in junction with switching the 8K pattern of CROM to impro...
by aquasnake
Tue Nov 24, 2020 6:39 am
Forum: NES Hardware and Flash Equipment
Topic: Gryzor - interesting bootleg
Replies: 33
Views: 16104

Re: Gryzor - interesting bootleg

ks7049 is vrc2 clone, I dumped. But the mapper IC (KS204) only has 28 pins? yes,this cart rom working 23 CRC: 295EFA08 SHA-1: 8F4202AEACC78877DD69718EE184096CC6C7F881 System: NES-NTSC Board: KONAMI VRC2/Mapper 23, Mapper 23 PRG-ROM: 128k CHR-ROM: 128k W-RAM: 8k Solder Pad: H:0 V:1 Dump: Unknown con...
by aquasnake
Sun Nov 22, 2020 8:01 am
Forum: NES Hardware and Flash Equipment
Topic: Troubleshooting Top Loader Issues with power and PPU
Replies: 7
Views: 2572

Re: Troubleshooting Top Loader Issues with power and PPU

DENDY: 6527P+6538+26.601712M xtal
NTSC: 6527+6528+21.47727M xtal

make sure CPU and PPU belong to the matched chipset
by aquasnake
Fri Nov 20, 2020 6:02 pm
Forum: NESemdev
Topic: Project Nested - NES emulator for SNES
Replies: 47
Views: 26640

Re: Project Nested - NES emulator for SNES

Soon after you released this tool, some smart merchants used your works to pack NES ROM and sell them as SNES multi-carts. Some of them crashed due to imperfect emulation. I wonder if the manufacturer of this kind of cartridge has contacted you? If we are using open source products to do business, I...
by aquasnake
Fri Nov 20, 2020 6:45 am
Forum: NES Hardware and Flash Equipment
Topic: How to design the PCB of PIC18f2520 microcontroller
Replies: 9
Views: 488

Re: How to design the PCB of PIC18f2520 microcontroller

BAT54 has 0.3V Vf,it can be accepted. Some mature designs use a PMOS to control power cut-off, or LDO with EN pin. The voltage drop of the former is also 0.3V (PMOS on the power path can be seen in most designs), while the latter is more common in handheld low-power systems Diode access should be av...
by aquasnake
Thu Nov 19, 2020 5:08 pm
Forum: NES Hardware and Flash Equipment
Topic: Super Mario Bros (2 players hack) repro hell
Replies: 3
Views: 439

Re: Super Mario Bros (2 players hack) repro hell

epm240 has enough capacity to emulate VRC6

thers is one thing i dont know why VRC series (2/4 /6) are so strict with SRAM timing.
by aquasnake
Thu Nov 19, 2020 3:09 am
Forum: NES Hardware and Flash Equipment
Topic: How to design the PCB of PIC18f2520 microcontroller
Replies: 9
Views: 488

Re: How to design the PCB of PIC18f2520 microcontroller

two power sources and one destination port,should add diodes to prevent the short cut between different VDDs.

for example, when the board is powered on and connected to a download cable meanwhile
by aquasnake
Wed Nov 18, 2020 7:02 pm
Forum: NES Hardware and Flash Equipment
Topic: Why does the Game Genie only connect to PPU address lines 2, 4, 5, 6, 7, and 13?
Replies: 13
Views: 2650

Re: Why does the Game Genie only connect to PPU address lines 2, 4, 5, 6, 7, and 13?

lidnariq wrote:
Wed Nov 18, 2020 6:52 pm
aquasnake wrote:
Wed Nov 18, 2020 6:25 pm
The entire BIOS ROM has only 16K PRG ROM data.
4KB. Existing dumps are overdumps.
good news for that, i can put into menu loader
by aquasnake
Wed Nov 18, 2020 6:25 pm
Forum: NES Hardware and Flash Equipment
Topic: Why does the Game Genie only connect to PPU address lines 2, 4, 5, 6, 7, and 13?
Replies: 13
Views: 2650

Re: Why does the Game Genie only connect to PPU address lines 2, 4, 5, 6, 7, and 13?

I realized that I actually didn't have anything better to do at the moment, so I constructed a truth table for the entire ROM: A7 A6 A5 A4 A2 D0-D3 D4-D7 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 1 1 0 1 0 0 1 0 0 0 0 0 0 1 0 1 1 0 0 0 1 1 0 0 0 0 0 1 1 1 1 1 0 1 0 0 0 0 1 0 1 0 0 1 0 0 0 1 0...