Yeah it is mapper 225 (also duplicate as 255).
It is one of the very first cartridges from my website. At that time when I could not find an existing number from the mapper database I was just assigning my own number (933) in order to test the dumped rom in emulator

My dump's CRC32 is same as from ...

I think I'll have to hack the input's routine to make it compatible with the 4pl Hori adapter to play on a real Famicom.

No idea if you're making it only for yourself or want to attract more people, though 4pl Hori adapter for FC is quite rare.

I have 4pl Hori clone designed my myself that lets ...

Solution A:
Make a microcontroller device (avr attiny or avr atmega should be enough) with one button and female 15pin plug taht will be plugged into exp port

+-------------------[GND ]---------------------[ AVR ]
|+------------------[$4017.CLK]---------------------[ ]
|| +------------[OUT0 ...

I recently obtained bootleg carts for "Exciting Basket"

Could you please check with multimeter connections between other chips and KS-201, specifically its pins: 2,3,4,5,6,7,8,9,10,11,12,13,24,25,26
I tried to figure out what is going on in this cartridge but I gave up after many hours, mainly ...

There is a game named "Super Chinese" that uses MMC3 (mapper 206) but has only 32kB PRG-ROM and 16kB CHR-ROM.
https://obrazki.elektroda.pl/3591786500_1751179033_thumb.jpg https://obrazki.elektroda.pl/4399735400_1751179039_thumb.jpg
//orig-pcb.jpg
//orig-shell.jpg

It changes banks in four places ...

Yeah, writes to $f000 acknowledge the irq as well. Luckily I got 74191 counter in my drawer and found out that when /CTE (CounT Enabled) is high, RCO (Ripple Carry Out) is deasserted, so Interrupt is deasserted when $f004.0 becomes 0. (They dont mention about that in datasheet)
Interrupts will be ...

Just for an exercise, I squeezed all the equations and made GAL16V8 to be entirelly responsible for banking.
By using output-with-feedback as latches and feeding diode-ANDed: M2, /ROMSEL and CPU-A14, I was able to even have one unused output pin.

I designed special PCB for that version for testing ...

scr3.png
//scr3.png


[.......E] @ $F004
+--- 0: stop irq counter and clear prescaler; 1: start irq counter

[CCCCCCCC] @ $F000
++++++++--- directly set IRQ counter value and acknowledge irq

IRQ operation:
If E==1, on every CPU cycle prescaler is incremented.
If it reaches 64, irq counter is ...

Looks very suspiciously similar to this Gremlins 2 PCB:
http://krzysiobal.com/carts/?action=view&id=321

which is then identical to this Gremlins 2 which has IRQ counter working exactly as you described:
http://krzysiobal.com/carts/?action=view&id=320

BTW. Is your PCB J-31C or J-33C?

I have another version
GAL20V8.zip


Ok so schematic of your board is:
sch [gal20v8].png
//sch [gal20v8].png

and GAL pinout is:

._____ _____.
| \__/ |
CLK | 1 24 | VCC
CPU_D5 | 2 23 | CPU_A14
CPU_D4 | 3 22 | CLK_OUT
CPU_D3 | 4 21 | CHR_A16
CPU_RnW | 5 20 | CHR_A15
CPU_D0 | 6 19 | CHR ...

Jack wrote: Thu Jun 19, 2025 7:48 am Perhaps the 16v8.jed generated above still cannot work properly, and further verification and correction of its file are needed to truly achieve normal operation!

Sorry, mistake in logic formula. Please download it again.

I made improved version of the dumping device I described here .
It allows any arbitrary asm code to be send from PC to the dumper memory, which is then executed by console's CPU, results are stored back in dumper memory and send back to PC.
https://obrazki.elektroda.pl/9144439500_1750343143_thumb ...

pcb-components.jpg pcb-top_corr1.jpg pcb-bottom_corr1.jpg scr.png

The only protection I could imagine would be that 2k of RAM is mapped only at $6000-$6fff instead of full $6000-$7fff with mirrors, because PAL inputs both CPU-A11 and CPU-A12 and A12 is not used at all, but I don't see that the ...

What do you want to discuss? Wiki says that

* Both boards add PRG RAM at the usual $6000
* There is one register:
$4020-5FFF: [PPPP CCCC]
P = Selects 32k PRG @ $8000
C = Selects 8k CHR @ $0000


but 74174 has just 6 bits, so it's rather

$4020-5FFF: [..PP CCCC]

and RAM is only 2kB instead ...

28pin EPROMs (27512/27256/2732) or 32pin EPROMS/MASKROMS (27010, 27020, 27040, 27080) have two chip enable pins (/CE and /OE) and usually
/CE = PPU A13 and /OE = PPU /RD

28pin MASK ROMS, like in your cartridge, have only one chip-enable pin (pin20 = /CE)
But it can be enabled only if PPU A13 = '0 ...