nesdev.com

I'm pretty sure that it has the same pinout.
I've checked several pins an they are match.

I've never seen these games. Actually nj-1b and nj-1c for Final Fantasy VII. I made Diablo II from one of them.
Nj-1 for Pokemon Yellow.

When I tried to make Pokemon Yellow from FF VII board then it has freezed when screen is scrolled outside a home. So I have to bought original Pokemon Yellow cart.
By the way, I have several design of pcb with mapper 163.
NJ-1, NJ-1B, NJ-1C

Clone on 1818p is quite common in Russia because first models of "Dendy" have this chip. You wont rid off jailbars completely, even if you build external video amplifier. You can try this scheme to fix sound: uGuFedOhVEg.jpg * Remove components marked with grey. "мкф" is uF https://youtu.be/VUQ7KATQ...

I thought that scheme for 3th and 4th controller is popular https://forums.nesdev.com/viewtopic.php?t=18066#p229366 In all japanese games where only 1 or 2 players available 3th and 4th will work like 1st and 2nd. More interesting how japanese 4-player adapter works. It uses a way from NES four scor...

What happens when cartridges try to disable the internal CIRAM in clones where it's permanently enabled? I hear people saying that "games don't work", but what exactly is the visual result of trying to use these cartridges? In most cases pin for disabling ciram is used for detecting cartridge prese...

So dev cartridge is needed for testing purposes from time to time. I know that invitenes has some integration with assembler studio to debug in realtime on hardware. But i'm not sure that everdrive has something similar. So for debugging you don't have good alternatives to emulators. Topic starter h...

Nowadays for retro gamedev you can use emulator. The only reason of using dev cartridge is unique hardware.
Also everdrive clone doesn't have much difference from original, so it can be used in the same way.

Dwedit wrote: ↑

Tue May 26, 2020 5:00 pm

Two bad CPUs sounds unlikely

It is quite real situation. I have repaired famicom where both cpu are gone due to short circuit in cartridge.

But it is better to buy replacement famicom board on ebay than buy chinese cpu. It is really high chance to get faulty cpu from aliexpess.

Good job!
Seems I know one more console with the same schematics
Coolbaby RS 40
https://aliexpress.ru/item/33005168169.html

It also has problems with some cartridges and fails on chr ram test.

lidnariq wrote: ↑

Mon May 04, 2020 11:11 am

There's pedantically no "CHR RAM" on Gauntlet – it's only used for nametables.

Thank you. I also forgot about TQROM.

I've done my copies of Gauntlet and Rad Racer II for famicom. First run shown garbled graphics because I forgot that A10 and A11 of RAM should be tied to cartridge pins directly.

What does that mean? Is Forever DUO 852 Games of NES a Coolgirl cartridge, then? Because the bank register writes do not look like it. No, but it can be modified (new wiring and updating FPGA program) to use ROMs that created in Coolgirl ROM builder. FPGA is cheaper so only few mappers are availabl...

I want to understand how 4-screen mirroring implemented in DRROM board. Seemsq Gauntlet the only game that uses this approach (combine CHR RAM and ROM).
Is it correct wiring?

CIRAM /CE is tied to VCC
PA13 is tied to CHR ROM /CE
/PA13 is tied to CHR RAM /CE

This board was discussed some time ago on emu-land http://www.emu-land.net/forum/index.php ... msg1428464
Scheme was changed to work with Cluster's dumper and ROM builder. Also some mapper kits are available.