MiSTer forum unveils Apple IIgs test builds as core work advances

MiSTer FPGA forum users have uploaded test builds for an in-development Apple IIgs core, and RetroRGB’s weekly MiSTer roundup highlighted the activity and early findings; one developer posted that "soon they will be needing some help working through the game catalog." The test images and community notes surfaced during the week ending February 25, 2026 as developers continue iterating on the port.

The Apple IIGS context matters for what the core aims to reproduce: "The Apple IIGS was a 16-bit personal computer by Apple, released in 1986." RetroRGB notes the machine offered substantially improved graphics and sound over the Apple II, provided backwards compatibility, was Apple's first computer with a color graphical user interface, and ultimately blurred the lines between the Apple II and Macintosh before Apple discontinued the Apple II line to focus on the Macintosh.

Technical progress and community activity on the forums are already concrete. "On the MiSTer FPGA forums, users have uploaded test builds for the in-development Apple IIgs core." Several forum contributors have uploaded test images and shared early findings while developers iterate on the port, and the explicit developer comment about needing help indicates a forthcoming call for community testing and catalog work. The roundup does not include exact forum post timestamps or thread URLs in the excerpted notes.

RetroRGB’s roundup also flagged related MiSTer work beyond the Apple IIgs. "A core dedicated to VS NES arcade games is in development. A test core with MRA is currently available on the MiSTer FPGA forums." The roundup notes that "The VS System was an arcade machine that was powered by NES hardware and its games mostly consisted of NES conversions," which frames what the VS NES core intends to replicate.

Arcade ports and maintenance work showed measurable wins in the same roundup. "The Coinop Collection Team has made Sky Shark playable on the MiSTer FPGA." RetroRGB describes Sky Shark as "a shooter that's based on the Twin Cobra Platform." The roundup further notes maintenance fixes to Snow Bros and Technos16 based games, and points readers to a free Patreon post for more details on Sky Shark and the latest development.

A detailed maintenance block lists Jotego's PMD85 work in full: Complete core rework. Upgrade to new MiSTer framework. Added Mega ROM support (one Mega ROM image included). MIF85 clock fix. Keyboard changes to match PMD85 emulator from Borik brothers. Added Mouse support. i8253 fix - issue when FFFF value was loaded (Atomix game was missing stripes over logo). Video output to MiSTer subsystem is now synced with Video Clock (better image fidelity to original HW). Added PMD85 version 3. Those items tie a clear bugfix (Atomix logo stripes) to Jotego’s maintenance effort.

The roundup also lists Ondra SPO 186 and a heading for IQ151, but the supplied excerpt contains no further details for those entries. RetroRGB’s summary and the MiSTer forum uploads together show active development across multiple cores; with the Apple IIgs port now at forum test-build stage and a developer asking for catalog help, expect the community to play a direct role as testing and verification ramp up following the February 25, 2026 updates.