After SMB2J and SMB3, I think that Gryzor might be next game that has many bootleg versions.
After the first version (that photos can be found somewhere on this forum):
I got photos of second version (unfortunatelly this cartridge is not in my possesion, but I can buy it so if the dump is not available, so let me know and I will get it
What is extremelly weird is that they used 2kB RAM (6116) + buffer (74244) + mux (74157) to make eight 7-bit wide CHR registers.
Mirroring is probably hardwired to V and CHR-ROM's A0 and A3 are inverted.
VRC2 has 40 pins. Have to remove 12 to fit in a DIP28...
With only 128 KiB of PRG, we don't need CPU D4, PRG A17. With only 128 KiB of CHR, omit CHR A17.
Without microwire interface, don't need M2, DO, DI, SK, CS.
With external 74'32, don't need PPU /A13, PPU /OE, CHR /CE.
But that's only 11, and I cannot figure out what else they could get away with excluding. Did they omit the ability to control mirroring?
VRC2 has 40 pins. Have to remove 12 to fit in a DIP28...
With only 128 KiB of PRG, we don't need CPU D4, PRG A17. With only 128 KiB of CHR, omit CHR A17.
Without microwire interface, don't need M2, DO, DI, SK, CS.
With external 74'32, don't need PPU /A13, PPU /OE, CHR /CE.
But that's only 11, and I cannot figure out what else they could get away with excluding. Did they omit the ability to control mirroring?
Ks202, ks204 is Kaiser's custom chip or CPLD.
Contra J has no IRQ, MAPPER is simple.
ks204+74xxx.
ks202,ks204应该是kaiser公司的定制芯片或CPLD。
Contra j 没有IRQ,MAPPER简单。
ks204+74xxx.
But you said KS7049 is a VRC2 variant? (Is its ROMs' contents only difference in the title screen?)
On the board, I see a 74'32 (I assume is there to enable a 28-pin 128 KiB CHR ROM), a 74'157 (I have no idea what it is doing), and a KS204 (VRC2 clone?)
Can the KS204 change nametable mirroring?
Last edited by lidnariq on Sun May 13, 2018 6:55 pm, edited 1 time in total.
Do you have KS204 pinout? I have photos of 2 bootleg carts, based on them:
Gyruss and Metroid
But they are probably using them in some uncommon way + they are not mine so can't trace tracks underneath chips:
krzysiobal wrote:Do you have KS204 pinout? I have photos of 2 bootleg carts, based on them:
Gyruss and Metroid
But they are probably using them in some uncommon way + they are not mine so can't trace tracks underneath chips:
this cart is dumped.rom pulibc.working in fceux and nestopia plus!
I have this two cart. I have more fds2nes cart. all dumped,all emu.