JOTEGO

Some improvements

Added 2025-11-21 17:34:00 +0000 UTC

Polishing work on the Run'n Gun core continued this week. The core looks now much better on MiSTer and SiDi128 but the Pocket version still needs a few more days of work.

A while ago, one of our directors requested a core for Caliber 50, a game similar to Ikari Warriors. This title shares some logic with the JTKIWI core and will enable a bunch of related games (Arbalester, Down town, Meta Fox, Twin Eagle...). A new core for this system is coming up. It is already booting to an error screen after just a few days of work so it is really exciting!

Graphical improvements to Run'n Gun core

No public on right side of the court
Players' shadows implemented
Cleaned graphics garbage to the left and on top of the screen
Improved SDRAM throughput on MiSTer and SiDi128, which results in fewer graphics artifacts

The Analogue Pocket version still has two big problems we are working on:

Timing problems accessing the external memory used as frame buffer may produce a noisy output or a completely blank output. The root cause is understood and the solution is on its way
Image still shows a black frame around it

Other changes

Fixed false FAUL on Hyper Sports caused by sprites being shifted one pixel to the left
Tighter speed control of the M68000, keeping the frequency within ±0.5% of the target despite SDRAM congestion. This improves all cores using an M68000