![kee willem eprom programmer arcade roms kee willem eprom programmer arcade roms](https://www.jammarcade.net/images/2017/01/image3-e1485412891442.jpg)
Optional higher Vcc voltages (5.6v and 6.2v) will be available when an external AC power supply is used. Quality components are used, for example, the high current tolerant coil is used to boost the robustness of the circuitry. High precision digital switching ICs are used to control the Vpp circuit ( vs cheap regular transistor controlled), thus dramatically improves the burning accuracy and reliability by multitudes. The PCB layout is fully optimized and the digital circuitry is separated from the power supply circuit, thus reducing interference. This board has many enhanced features, such as built-in PLCC32, FWH / LPC sockets, thus NO NEED to pay extra to purchase these optional adapters. This is a brand-new and fully tested enhanced Dual Power (USB/AC) KEE EPROM EEPROM programmer, PCB version PCB5.0.
#Kee willem eprom programmer arcade roms code
All that code goes into that one ROM, replacing the original PS4 simulation code.Item: 302890062145 *NEW* KEE Willem EPROM programmer, BIOS, Designed in the USA ! ShipfromUSA !. I did not change anything in the logic, so it should have the exact same behavior as the original boards, unless the extra time taken by the main Z80 CPU to execute it causes some impact. It was written in 6800 assembly, so I had to through out some unnecessary stuff and convert it to Z80 assembly. Now, thanks to MAME decaping project, we got to know the source code for the PS4 chip. Also, that ROM chip I mentioned had a lot of unused space to accommodate it. It looks like there was enough spare time to execute that at the beginning of each interrupt cycle. They created some "black-box simulation" code to run as part of the main Z80 CPU. The people that created the bootleg boards did not have access to the PS4 chip, so they had to "guess" how it worked (that is why those boards do not behave exactly like the original one). That is a ROM, it can't be reprogrammed, so you will need to burn a new EPROM (or use a 27SF256 electrical erasable one, which is a drop-in replacement).
![kee willem eprom programmer arcade roms kee willem eprom programmer arcade roms](http://members.iinet.net.au/~lantra9jp1_nbn/gurudumps/tutorials/how_to_dump/EPROM_27512d.jpg)
The ROM is likely the M5M27256P chip at column 1, row H, to the left of cap C9 (or the one above it, TMM24256AP). Hi, I see from the picture that I have the same board model as yours! I bought it in non-working condition and had to replace 30 (!) chips to restored it! That was a lot of fun. If yours don't match the one above them please send me the image file so I may take a look at it. The one I'm currently using on MAME, "boblbobl", has the following SHA-1 hash:
![kee willem eprom programmer arcade roms kee willem eprom programmer arcade roms](https://i.ytimg.com/vi/lS3gSW3ZskQ/maxresdefault.jpg)
I hope your burner is able to ready and display the ROM contents. It is the one that has the follwoing copyright notice at the end: "VER 0.018.AUG, 1986 SUMMER", at address 7F4C. I think it is the one in the middle, but I'm not sure. The ROM is one of the three at the edge, near the flat cable that connects the two boards, right above one of the Z80B chips.
![kee willem eprom programmer arcade roms kee willem eprom programmer arcade roms](https://hp9845.net/9845_backup/tutorials/romdump/images/willem_programmer.jpg)
#Kee willem eprom programmer arcade roms Patch
You need to verify if your ROM matches the one I currenty targeting, or send me the image so that I may attempt to patch it. Also, there may be some differences between the bootleg boards, but I think all ROM images are very similar and it should not be a problem for me to provide a patch. This rules out those bootlegs that have a 68705 chip, but that seems to be rare anyway (I never saw a picture of one like that). True, the solution will only work for those boards that already use the Z80 to emulate the PS4.