Search found 602 matches

by krzysiobal
Sun Jan 12, 2020 1:49 am
Forum: NESemdev
Topic: Moero Pro Yakyuu voice
Replies: 73
Views: 68836

Re: Moero Pro Yakyuu voice

I got photo of another version of this cartridge. All connections are probably the same, just the PCB is smaller:
Image Image
by krzysiobal
Fri Jan 10, 2020 2:40 pm
Forum: NES Hardware and Flash Equipment
Topic: Creative 72-Pin cart to Famicom adapter project
Replies: 5
Views: 185

Re: Creative 72-Pin cart to Famicom adapter project

Those pins from black cartridge connector can easily become loose and ultimately go deep inside plastic when not soldered into PCB.
Especially if this is currently produced 60/72 pin connector made in people republic of china.
by krzysiobal
Fri Jan 10, 2020 2:03 pm
Forum: NESdev
Topic: Galaxian - is patch for PAL console available?
Replies: 4
Views: 169

Re: Galaxian - is patch for PAL console available?

Thank you! I needed to add extra 50 scanline delay to compensate longer PAL Vblank time. I changed ;~5169clocks (45.5 scanlines) A0 EB | LDY #235 | loop16: C6 E0 | DEC l_crud C6 E0 | DEC l_crud C6 E0 | DEC l_crud 88 | DEY F0 03 | BEQ skp001 4c 88 e2 | JMP loop16 into ;~10278 clock (90 scanlines) A2 ...
by krzysiobal
Fri Jan 10, 2020 1:33 pm
Forum: NESdev
Topic: Galaxian - is patch for PAL console available?
Replies: 4
Views: 169

Galaxian - is patch for PAL console available?

Due to different vblank time, scroll split happens in wrong moment and this game is unplayable on PAL NES. And because this cartidge was only released in Japan, there is no European equivalent of this title, maybe except Galaga, which is different game. Anyone know any patch to force Galaxian into P...
by krzysiobal
Fri Jan 10, 2020 10:40 am
Forum: NES Hardware and Flash Equipment
Topic: Mission: Impossible --> Rescue an rare 42in1 ROM
Replies: 16
Views: 409

Re: Mission: Impossible --> Rescue an rare 42in1 ROM

Take a multimeter and check if PIN1 of this mask-rom shows any voltage drop with reference to other pins, when in diode test mode.
by krzysiobal
Wed Jan 08, 2020 6:59 am
Forum: Reproduction
Topic: Magickid Goo Goo / Mapper 190
Replies: 5
Views: 188

Re: Magickid Goo Goo / Mapper 190

According to the previously described hardware info at mapper 190 page, it must be that two 74670 latches CHR bank and PAL latches PRG bank and generates other signals (for RAM/ROM and 670). The original cartridge used PAL16R4, which assumes registered mode for the 4 bits of PRG-bank and they are al...
by krzysiobal
Mon Jan 06, 2020 4:45 pm
Forum: Reproduction
Topic: Magickid Goo Goo / Mapper 190
Replies: 5
Views: 188

Re: Magickid Goo Goo / Mapper 190

Image


Be advised that all those chips (except RAM and ROMS), diodes an pull-downs can be replaced with just one small CPLD (epm3064 or xc9572)
by krzysiobal
Sun Jan 05, 2020 2:44 am
Forum: NES Hardware and Flash Equipment
Topic: Mt777dx famiclone reverse engineering (not the popular one)
Replies: 0
Views: 174

Mt777dx famiclone reverse engineering (not the popular one)

No, it's not the popular mt777dx, this is something different. Internal shape of mainboard resembles the original famicom. CPU (TA-03NP) clocked by the 21.xxx MHz crystal. But why there is second 26.xxx MHz crystal on the PCB with A/V/DC connectors? It turns out that it is used for the PPU (TA-02NP)...
by krzysiobal
Sat Jan 04, 2020 3:38 pm
Forum: NES Hardware and Flash Equipment
Topic: Adapter to properly support 3.3V carts
Replies: 28
Views: 1138

Re: Adapter to properly support 3.3V carts

Well, there are 2 free gates in one of the 245's to /A13 can be theoretically translated into 3v3, but because this chip it is quite far away from the /A13, I would need to add plenty of vias. I was making this PCB adapter in home using etching and driling, so I wanted to save time and effort. Plus ...
by krzysiobal
Thu Jan 02, 2020 11:28 am
Forum: NES Hardware and Flash Equipment
Topic: Adapter to properly support 3.3V carts
Replies: 28
Views: 1138

Re: Adapter to properly support 3.3V carts

I did something that few months (or years, can't remind) ago, worked great for usual carts (that is - CPU can access cart at $6000-$fff, PPU can access it at 0000-$1fff ). It only needs 7x 74245 and one NAND gate. Now I tested it on some other 500-in-1 chinese cheap cart and it did not work. The rea...
by krzysiobal
Wed Nov 20, 2019 4:45 am
Forum: phpBB Issues
Topic: What happened to the Nesdev phpBB theme?!?!
Replies: 74
Views: 9211

Re: What happened to the Nesdev phpBB theme?!?!

Totally ugly, even the avatars of post's authors are on the right side. What a mess.
And why the "Submit" button changed its place from left to right also.
Can find 98 more reasons that old scheme needs to be reverted back
by krzysiobal
Mon Nov 18, 2019 12:37 am
Forum: NES Hardware and Flash Equipment
Topic: Timing properties of the 2A03's write cycles
Replies: 4
Views: 1644

Re: Timing properties of the 2A03's write cycles

So it seems that when the CPU writes to the PPU or any other peripheral, the wrong value is always on the data bus for a whole half dot. The surprising part is that everything isn't glitchy. That's why during write cycle all memory chips (RAM, ROM) latches internally the destination address on the ...