Mega Update - Sega System 32

🕹️ SEGA SYSTEM 32 CORE: MEGA UPDATE

🎨 Per-line clip windows and flipped backdrop

Added the per-line clip windows used by the Title Fight boxing ring, the Golden Axe: The Revenge of Death Adder torch/ending scene, SegaSonic and Jurassic Park. Also, the backdrop color table now flips correctly when a game flips the screen. This makes all the following effects render correctly.

Source: MAME change #16038.

🧠 Faster, smaller V60 CPU

The V60’s 32 registers used to be a big bank of flip-flops. They now live in the FPGA’s small memory blocks, with a per-byte “last writer” tracker so reads always get the newest value.
Result: It frees up space for the new features. Logic use went from 90% down to 86%.

⏱️ Reworked clock plan

What: Main clock is now 50 MHz and it is also the video clock. The SDRAM runs at 100 MHz. The 320-pixel mode now uses the board’s real 6.25 MHz pixel clock exactly (8 clocks per pixel).
Result: The timing relationships now follow the real board, with fewer derived clocks.

📺 New menu layout and CRT options

What: The OSD is now two pages, Video Settings and Game Settings, laid out like the Heavy Unit core. Video Settings has Aspect Ratio, Scaling, CRT Adjust, H-Size, H-Position and V-Shift.
Also new: Framework gamma support, so your .gam files from MiSTer now apply.
Heads up: The CRT options only appear on direct video or analog output. They are hidden when the HDMI scaler is active.

🎯 CRT Adjust keeps a stable picture

What: CRT Adjust output now goes through the same fixed pixel grid as the normal picture.
Result: Before this, turning CRT Adjust on re-introduced the column tearing. Pixel spacing is now constant in every mode, including 320-pixel with a width change.

🧹 Scandoubler Fx option removed

What: The Scandoubler Fx menu item is gone. The core has no scandoubler, so it was doing nothing useful. It was actually dimming every other line on VGA and Direct Video.
Tip: On a 31 kHz monitor, set vga_scaler=1 in MiSTer.ini.

🔫 Invert Gun Stick Y

What: New lightgun option that flips the analog stick’s vertical axis for both players.
Safe: Mouse, D-pad and X-axis aiming are unchanged.

🗜️ Smaller CRT Adjust logic

What: Replaced about 770 flip-flops in the CRT Adjust sync delay with a timestamp-based delay.
Proof: Output is bit-identical to the old version across 13 million test samples.

🔧 Ported from my OutRunners core

V60 MOVD fix

A 64-bit move instruction was reading a register’s contents as a memory address. In OutRunners this made the game boot into test mode. Auto-increment also stepped by 4 bytes instead of 8. Both are fixed.

Safer NVRAM saves

Saving settings could come out shifted by one word. Fixed with a small shadow memory.

Smoother sprites

Zoomed-in sprites are drawn faster, and the next sprite row is built while the previous one is still being written out.
Goal: less sprite flicker and slowdown in busy scenes.

Better steering with a D-pad

D-pad steering now works in every driving game. It only takes over when the analog stick is centred, so you keep smooth proportional steering.

How to install

Get downloader_meatcores.ini below and place it in your mister SD card root folder, right next to downloader.ini

Run Update_All then load the games from Arcade/Meatcores

To update Meatcores and get any new games just run Update_All again

If you have downloader_meatcores.ini already just run Update_All then load the games from Arcade/Meatcores