1. Be sure that the ROM occupies whole memory (if it is less that the size of it, mirror it across whole memory)
2. Check if PGM/WE lines of the memories are tried to VCC
3. Check if the game requires RAM and repro-cartridge provides it.
Search found 1037 matches
- Tue Mar 26, 2024 3:50 pm
- Forum: Reproduction
- Topic: Repro freezing and screen garbage
- Replies: 2
- Views: 165
- Mon Mar 18, 2024 8:50 am
- Forum: NES Hardware and Flash Equipment
- Topic: ELI5: What can the NES HUB do?
- Replies: 2
- Views: 468
Re: ELI5: What can the NES HUB do?
Same question as `what you can connect to cartridge port` or `joypad port`. Anything your imagination can bring. 1) I don't see any potential in the expansion port because from the CPU bus it has only data pins, but no R/W, no M2, no address pins - you don't know what is going on the bus except $401...
- Tue Mar 12, 2024 10:00 am
- Forum: NES Hardware and Flash Equipment
- Topic: Strange multicart
- Replies: 4
- Views: 444
Re: Strange multicart
$6000.A1 | $6000.A0 | PRG A18 | PRG A17 | CHR A18 | CHR A17 0 | 0 | 0 | 0 | 0 | M 0 | 1 | 1 | 1 | 0 | 1 1 | 0 | 0 | 1 | 1 | 1 1 | 1 | 1 | M | 1 | 0 M - bit comes from MMC3
- Tue Mar 12, 2024 12:28 am
- Forum: NESdev
- Topic: Final Fight 3 (mapper 90), get rid of multiplier, issues
- Replies: 12
- Views: 3101
Re: Final Fight 3 (mapper 90), get rid of multiplier, issues
Pinout of the mapper chip confirms it is mapper #90.
Interestingly, PRG CHIP has pinout of regular 8bit DIL32 EPROM, while CHR has 8/16bit 27320-like EPROM.
Interestingly, PRG CHIP has pinout of regular 8bit DIL32 EPROM, while CHR has 8/16bit 27320-like EPROM.
- Sun Mar 10, 2024 12:05 am
- Forum: NES Hardware and Flash Equipment
- Topic: Boot Up delay solution to prevent slowly configuration from FPGA.
- Replies: 6
- Views: 494
Re: Boot Up delay solution to prevent slowly configuration from FPGA.
always @(negedge m2) You can't do it on falling edge, because ROM CHIP (or you FPGA) will not have enough time to drive its data output before CPU wants to sample it. Generally you can't also do it on rising edge, because /ROMSEL is not stable yet and you wont be able to distinguish between $4C4C a...
- Sat Mar 09, 2024 3:51 am
- Forum: NES Hardware and Flash Equipment
- Topic: Boot Up delay solution to prevent slowly configuration from FPGA.
- Replies: 6
- Views: 494
Re: Boot Up delay solution to prevent slowly configuration from FPGA.
Tragically, there is no great way to handle this. The least bad option we've come up with is to stuff the CPU's data bus with an endless stream of $4C or $6C, which will keep the CPU doing something safe until the FPGA can take over (and recover from this) Yeah exactly, pull-up the CPU data bus wit...
- Thu Mar 07, 2024 1:52 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Fishing simulator with undumped game: King Fishing
- Replies: 3
- Views: 1595
Re: Fishing simulator with undumped game: King Fishing
Incredible, thank you!! I think you might be correct with RX1 and RX2 being related to the tilt sensors. I've found it to be consistent in multiple emulators that it's constantly pulling the line left. When enabling an expansion port peripheral, the tilt control commands (casting the line, moving t...
- Wed Mar 06, 2024 3:00 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Fishing simulator with undumped game: King Fishing
- Replies: 3
- Views: 1595
Fishing simulator with undumped game: King Fishing
Fishing simulator with undumped game: King Fishing I got recently an interesting plug&play famiclone: fishing simulator with undumped game: King Fishing. Shell It contains four-direction volant joypad and four buttons: * POWER, * RESET, * ESC (A button), * START (B button). https://obrazki.elekt...
- Mon Mar 04, 2024 9:09 am
- Forum: NES Hardware and Flash Equipment
- Topic: AUX on the Yobo Gameware FC2
- Replies: 7
- Views: 532
Re: AUX on the Yobo Gameware FC2
Are FC/SNES cartridge ports accessed just like in regular console, or are they only used to dump the game and emulate it, just like in Retron 5?
If that's the latter, maybe you can use the AUX port to plug-in pendrive with software update.
If that's the latter, maybe you can use the AUX port to plug-in pendrive with software update.
- Sun Mar 03, 2024 12:51 am
- Forum: NES Hardware and Flash Equipment
- Topic: MMC1 free implementation on CPLD released
- Replies: 39
- Views: 22206
Re: MMC1 free implementation on CPLD released
I still maintain my viewpoint that the MMC1 implemented by 64 macro cells is only a simplified subset, and it does not support IRQ (definitely), SUROM (perhaps), SZROM, SOROM, SXROM, SJROM, or/and SKROM. ??? MMC1 is just a 24-pin chip and can be fully implemented in 64 macrocell chip. All those S*R...
- Wed Feb 28, 2024 12:54 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Weird 15 in 1 Cartridge
- Replies: 13
- Views: 994
Re: Weird 15 in 1 Cartridge
Since this pin is stuck on Vcc, I did try a pull-down resistor, in the hope that it solves the problem. Now every byte has D3 (D6 after rearrangement) stuck to 0. Last hope is to to check if the reason for D3 being held at 1 is because of some internal short inside memory. If it is that case, memor...
- Tue Feb 27, 2024 12:17 am
- Forum: NES Hardware and Flash Equipment
- Topic: Weird 15 in 1 Cartridge
- Replies: 13
- Views: 994
Re: Weird 15 in 1 Cartridge
The address and data pins are in the wrong order. I was able to rearrange 15C.BIN to get something that looks like the correct CHR, but it doesn't match the board layout or krzysiobal's schematic, so I'm not sure what's going on... Why do you think so? After rearranging the data & address lines...
- Fri Feb 23, 2024 4:42 am
- Forum: NES Hardware and Flash Equipment
- Topic: Weird 15 in 1 Cartridge
- Replies: 13
- Views: 994
Re: Weird 15 in 1 Cartridge
sch.png 1. Those resistors are pull-ups to VCC, not pull-downs to GND! 2. interesting about the 330R resistors. Because both ROM data lines are all shuffled and the resistors connect not only the 3012A ROM but also 74161 latch, I suspect they are placed as an alternative way of further shuffling th...
- Mon Feb 19, 2024 1:48 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Famicom freezing...
- Replies: 4
- Views: 360
Re: Famicom freezing...
Yes, OAM part of your PPU might be broken and so the sprites are not displayed and sprite 0 hit does not trigger correctly.
- Mon Feb 19, 2024 1:47 pm
- Forum: NES Hardware and Flash Equipment
- Topic: Everdrive N8 not working on HVC-CPU
- Replies: 4
- Views: 451
Re: Everdrive N8 not working on HVC-CPU
Ask the creator of everdrive. We do not know how exactly everdrive works, does it capture address/bus signals after certain delay with respect to M2 clock or what. Some old famicom revisions have CPU with different duty cycle and M2 behaviour, I had a 168-in-1 (mapper 015) multicart that could not e...