FPGA compatible core of SNK M68000 (Ikari III based) arcade hardware for MiSTerFPGA written by [Erin Olafson]. FPGA implementation has been verified against schematics for Ikari III (A7007). PCB measurements taken from Datsugoku: Prisoners of War (A7008), Street Smart (A8007), and Ikari III: The Rescue (A7007).

Ikari III PCB donated by atrac17 / DJ Hard Rich and verified by [Erin Olafson]. Other SNK68K PCB verification done by atrac17. The intent is for this core to be a 1:1 playable implementation of SNK M68000 (Ikari III) arcade hardware. Currently in beta state, this core is in active development with assistance from atrac17.

• GFX toggles for sprite layers [Task - Low Priority]
• Measure full timings from PCB(s) for analog output [Task - Low Priority]
  
  
• Minor screen tearing present in Ikari III, sprites updating midscreen / check int and memory access [Issue]
• Correct colour palette in P.O.W. - Prisoners of War (US Version 1); dependent on sprite location / action [Issue]
• Correct text layer in 脱獄 / P.O.W. - Prisoners of War (US Version 1, Mask ROM Sprites) [Issue]
• Correct missing pixels during scrolling transitions for 脱獄 / P.O.W. - Prisoners of War (US Version 1, Mask ROM Sprites) [Issue]
• Audio issues known, may be an issue with the jtopl2 core or the current usage [Issue]

FPGA implementation has been verified against schematics schematics for Ikari III. PCB measurements taken from Datsugoku: Prisoners of War (A7008), Street Smart (A8007), and Ikari III: The Resucue (A7007).

Pixel clock: 6.00 MHz

Estimated geometry:

383 pixels/line

263 pixels/line

• Rotary control is supported via gamepad or firmware written by atrac17 / DJ Hard Rich for LS-30 functionality using an RP2040. Latency verification done by misteraddons, for more information click here.

• Native Y/C ouput is possible with the analog I/O rev 6.1 pcb. Using the following cables, HD-15 to BNC cable will transmit Y/C over the green and red lines. Choose an appropriate adapter to feed Y/C (S-Video) to your display.

• There are two H/V toggles, H/V-sync positioning adjust and H/V-sync width adjust. Positioning will move the display for centering on CRT display. The sync width adjust can be used to for sync issues (rolling) without modifying the video timings.

• Additional toggle to enable the scandoubler without changing ini settings and new scanline option for 100% is available, this draws a black line every other frame. Below is an example.

• Service menu is accessed by holding the F2 key on boot. Service dip is functional for Ikari III. P.O.W. and SAR: Search and Rescue require holding the F2 key on boot. Street Smarts requires the service dip to be toggled before resetting the core and holding F2.

• Rotary control is supported via gamepad or firmware written by atrac17 / DJ Hard Rich for LS-30 functionality using an RP2040. There are toggles in the OSD under Debug Settings to select the rotary controller type per player.
  
  When using a gamepad, enabling autofire and setting to 160ms for Rotate CW/CCW in the MiSTer framework allows for smooth rotation; adjust the rate to fit your preference. LS-30 firmware requires no mapping and is plug and play; it is player dependent and connected over USB to the DE10-Nano.

• Keyboard inputs mapped to mame defaults for the following functions.

• Custom keyboard inputs mapped for LS-30 RP2040 firmware functionality. The mapping is player dependent for the RP2040 firmware.