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I solved it myself. I discovered that the data line connecting the 315-5385 to the sound ROM was defective and replaced the 315-5385, and the sound came out perfectly.

Model 1 video board has a huge amount of 'HM65256' memory for frame buffer. When one or several of these memories die, the above symptoms occur. Or, one of the 74F240Ns controlling HM65256 may be broken.

The cause of this problem is corrosion caused by liquid leaking from the 'c200' supercap. 'PIN22' of IC22 - 'PIN9' of IC33 - 'PIN1' of IC84 All three points must be electrically connected, but if any one of them is disconnected, it will fail with the symptoms mentioned. If you check the short...

The amplifier connected to the speaker is normal. Other boards sound good. If you see the same noise playing repeatedly even when connected to system32's 'CND' connector, it seems that there is a problem with one of the components related to sound processing.

View: https://www.youtube.com/watch?v=CheYl23PnNw I bought a SYSTEM32 board that had a sound problem. Repetitive noise is played continuously and no sound effects or BGM are played. 5V and 12V are normal, and I double-checked that the IC35 and IC31 EPROMs were burned correctly. I have...

Go to test menu -> game test mode -> game assingments. And turn off the network.

awesome! I will buy it.

happy new year! Sorry for replying to an old post. I also came across your post while looking for a flash compatible with MX23L12811TC memory to convert the Naomi 171-8132B cartridge. I was surprised that there is no flash compatible with the MX23L12811TC. Have you found any compatible flash...

This is also possible on real hardware! VF4FT Bin 0002B834 'AB AA AA' to '39 82 E3'

Thank you for your kind reply. I just entered a watchpoint into the debugger. There is a possibility that a decrypted ROM can be created by analyzing the input/output data in the memory of the decryption board. I'll give it a try.

Thank you for the hint on how to use MAME. I've used the debugger to the point where I can look into the memory, but I need to study more.

spikeoutFE & Magical Truck Adventure

I asked AndyGeezer about purchasing a decryption ROM, and was told that they no longer produce or sell it. If you tell me that FPGA can be modified and used, I am willing to study it. I also recognize that FPGA programming is very difficult. But I hope it's a possibility.

hello. I have a Virtua Striker 2 bootleg security board and a Dynamite Deka bootleg security board. These boards used FPGA chips. So, I am wondering if it is possible to extract the data inside this FPGA chip and modify it so that it can be used to decrypt other games by inserting the 'key' of...

thank you! It's working well.

Sorry for asking again about an old post. Can you tell me how to patch VF4FT so that it does not check the version of the DIMM board?

I find out the cause of the problem and answer it myself. I left the power on for over 20 minutes while it was rebooting repeatedly, and then it suddenly started working. So I suspected the capacitors and replaced all the capacitors except related to the sound. Now boots without any problems...

hello. I recently bought the Silent Scope 1 PCB. When I turn it on Nothing is displayed on the screen, 'RA-PR-CH' is displayed on the 7-segment LED, and after the memory test, 'Er40' is displayed repeatedly and does not boot. If anyone knows what causes ER40, please help.

I made an IC22 using the BIN file for CF, but the test menu does not enter and the IC check is not normal. Can someone please share the patched IC22 file?

hi. I have a problem with my Model 3 board, so I need help. When I turn it on, I see strange patterns all over the screen and the text is messed up. And I can't proceed any further on that screen in the attached screenshot. The graphics board is fine. If you swap it with another CPU board, the...