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Analog circuit design remains an enigmatic discipline that has, to date, evaded the expansive reach of ChatGPT and similar technologies. It's therefore not entirely surprising that analog circuits represent the most overlooked element of arcade PCBs (Printed Circuit Boards). Yet, digital-...
2024-03-15 16:21:39 +0000 UTC View Post
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Arcade video games have three types of sound sources:
Last minute release today, please excuse us for the short post: we've managed to get Vendetta working in the JTSIMSON core. The hardware is extremely similar between the two systems, although they are incompatible. You cannot just swap the ROM chips from one to the other and get them working. The devic...
2024-02-16 16:44:44 +0000 UTC View Post
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We worked on Parodius da! schematics last year. It turned out to be very similar to The Simpsons board, with some differences:
Thanks for the feedback on last week's service release. Some regression errors were quickly identified by the community and appropiate patches have been applied:
Thanks to everyone who has taken the time to report an issue in GitHub. All files have been updated in JTBIN. You can run your favourite MiSTer/Pocket updater or grab the fil...
2024-01-26 10:03:54 +0000 UTC View PostAs most of you know, issues related to JTCORES are collected here. This includes road map items, reverse engineering activity, core enhancements and bug fixes. After the NeoGeo Pocket core release, I decided to take some time to...
2024-01-19 13:22:26 +0000 UTC View PostEspañol abajo
Just in time for reyes, the first beta core for NeoGeo Pocket is available for MiSTer and Analogue Pocket in the usual locations. Sadly, this core does not fit in &nbs...
2024-01-05 10:22:45 +0000 UTC View Post
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The NeoGeo Pocket core is the worst time to market from my career. I have worked on and off on it for the last two years. During some months, it has been the main focus. I also...
2023-12-22 10:16:00 +0000 UTC View Post
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When I made the JTBUBL (Bubble Bobble, Tokio) core, I had to limit it to certain game versions that used a MCU (Micro Controller Unit) for which I had found a Verilog module. That meant putting the original Tokio version aside and working only with the bootleg. The same ...
2023-12-08 16:18:32 +0000 UTC View Post
Thunder Cross
JTALIENS core gets support for one more game: Thunder Cross. This is a spectacular shooter with a good depth feeling thanks to the use of parallax scrolling and sprite scaling. As in Nemesis, you get options to fly along your ship. These options can eith...
2023-11-24 08:32:00 +0000 UTC View Post
The JTALIENS core receives support for a new game added this week: Konami's Gang Busters. This is a cute two-player game that reminds of Labyrinth Runner and CAPCOM's Avengers. The cop duo of the diminutive Smith and the taller Wesson (over the pistols Smith & Wesson), who can't help but...
2023-11-17 17:30:36 +0000 UTC View PostIf you see the core credits rolling through the screen but cannot play then:
Today is Halloween so we are going to introduce five Halloween-ish games. All of them are playable on multiple FPGA platforms through JT cores. Try them out if you haven't already!
First up is Haunted Castle, released by Konami in 1988, a rare reimportation from a consumer console to an arcade game. The...
2023-10-31 16:25:45 +0000 UTC View Post
Important: jtbeta.zip changed, you need to update your copy.
I used to believe in Christmas miracles, now I have to believe in Halloween miracles too! Just five days ago, the JTSHOUSE core was unplayable and with completely broken music. I thought that having this beta release was a long shot, but here ...
2023-10-31 16:15:54 +0000 UTC View PostAs there has been a recent surge in Patreon subscribers (thank you!) let me ask you about which FPGA model you are using. Select as many as you own. Note that multiple choice may only work through a web browser.
2023-10-29 08:52:06 +0000 UTC View Post
Work on the Splatter House core continues. The game graphics are correct and the demo is stable and does not hang up. But, the MCU seems not to be working correctly and as a result, the coin inputs get locked randomly. It looks like the days until Halloween are going to be scary to me as a developer!
On...
2023-10-27 10:24:18 +0000 UTC View Post
Quick update:
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Service Release
JTOUTRUN update: (Out Run support)
Konami used to roll new chip versions frequently and even merge two or three generations together. For Punk Shot, part of th...
2023-09-08 16:47:15 +0000 UTC View Post
Important note for Pocket users
In order to facilitate the installation of beta cores, this will be added to JTBIN from now on. Third party updaters will take them from there and add it to your Pocket, which is more convenient. But, you will need to manually unzip the jtbeta.zip to the folder As...
2023-09-01 09:22:33 +0000 UTC View Post
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Following last week’s Teenage Mutant Ninja Turtles' beta, we add support to MIA (Green Beret 2) to the JTTMNT core. The two arcade PCBs are very similar, but TMNT was a more expensive system. It had more chips and memory for sound ...
2023-08-25 14:38:29 +0000 UTC View Post
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As you probably all know, Furrtek made an awesome research work on the Konami chips used in...
2023-08-18 14:37:39 +0000 UTC View Post
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MiSTer users: update your jtbeta.zip file using the attached one
The late 1980s and early 1990s marked a dynamic era for both video games and popular culture, with iconic franchises leaving an indelible mark on us. Among these, "The Simpsons" s...
2023-08-11 14:39:32 +0000 UTC View Post
The NeoGeo Pocket core is taking most of our time at the moment. All monochrome games boot up now and are somewhat playable (see details here) but they all have problems and the core is only working on MiSTer at the mom...
2023-07-21 18:31:24 +0000 UTC View Post
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I developed the SEGA System 16 compatible cores in 2021. It was a difficult project because under that unifying System 16 name there are indeed many different arcade boards. For a starter, you have two different sprite and PCM sound approaches for the early System 16A b...
2023-07-08 09:07:11 +0000 UTC View Post
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Another week with too many things to talk about. Let’s just focus on the highlights
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The NGP core saw good progress this week with the first successful boot on MiSTer FPGA. Almost all the monochrome NGP system is implemented now, missing only the horizontal blank interrupt and the DMA logic. The cartridge interface (based around flash memory chips) is g...
2023-06-23 15:59:36 +0000 UTC View Post
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As promised, we will have a long run of Konami compatible cores either based on the Konami CPU or the TMNT video chipset. Super Contra joins the club today as part of the JTALIENS core. The largest difficulty in adding support for this system has been a bug in the CPU i...
2023-06-09 17:02:27 +0000 UTC View Post
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Today is the deadline I had set for the NeoGeo Pocket beta. I set this deadline to force myself to focus solely on this project. The core has seen a lot of progress and it boots up and runs through the language and clock set up screens. However, it hangs up soon after. ...
2023-06-02 10:32:34 +0000 UTC View Post
