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I created an adapter from 27c1024/2048/4096 to two 39sf010/020/040: It received only minimal testing so far, only that it boots into the PGM BIOS, so I'm not going to share Gerber files. Also, the KiCad project has some new changes over the version in the picture to support larger EPROM. (The...

I just had this in my Twitter recommendations: https://tinytapeout.com/ That sounds interesting to try and replicate some smaller ASICs, at least as a prototype.

Instructions: This zip file contains two further zip files with the gerber files for the program and character PCBs. You can upload them directly to a PCB manufacturer of your choice, I used https://jlcpcb.com/ , but anyone should work really. The program board will have 4 layers (a ground and...

View: https://youtu.be/O9ufiuXRN-8 Nothing we haven't heard before, but be prepared for a bunch of new visitors.

This is a quick pipeline test converting tilemaps data for IGS PGM and MVS, mainly to get a feeling for tilemap memory requirements. To try this you'll need to merge them with your own kov2.zip and ssideki2.zip, because these archives only contain my changed files. They are 7-zip archives...

I did make a start on laying out the char board. The problem is that you can fit max 8 x 27c322 onto a board, and then the space is tight for fix, sound and a small CPLD for de-multiplexing and banking. If you use larger flash chips you may need programming logic as well, and at some point the...

Before I reverse engineer it myself, does anyone have a jumper table for PROGGSC?

I experimented a bit with the IGS PGM version of Frog Feast: http://frogfeast.rastersoft.net/PGM.html http://frogfeast.rastersoft.net/PGMSrc.html I didn't get the NeoDev compiler to work, it just hangs indefinitely. I think I used a gcc built with the script from...

I just saw this on eBay, is this someone from here, or someone known? I was tempted to get it to look at it, but at that price I might as well get a Darksoft multi.

Someone is creating a graphics card for C64 based on the Bomb Jack arcade hardware: https://martin-piper.itch.io/bomb-jack-display-hardware/devlog/215560/tiles-board-testing View: https://youtu.be/dKMeg2XI5VM

My N64 displays an incredibly dark picture on my ancient Sony Bravia. A google search shows up several hits, but nobody with a definite solution... It is RGB modded, and it is from the time before Nintendo removed the RGB DAC, so it is just extra wires to the AV connector. Before I start with...

I am thinking about getting an OpenTendo NES PCB: https://github.com/Redherring32/OpenTendo I was wondering, does anyone know of clone cases for the front loader NES? I had a quick look on AliExpress and eBay, and there is a lot of noise from phone cases, and from Raspberry Pi cases. I am sure...

Here is one I've been thinking about for a while: A dedicated supergun for PGM consolization: This is exactly the same size as the PGM motherboard with matching mounting holes. Power and SCART at the back, joypad and test/power buttons at the front, together with extra connectors for player 3...

After debugging another project for a while I finally got it to work - by replacing the ATF22v10C with a Lattice 22v10B. Same programmer, same jed file, etc. The problem was that the ATF22v10 completely shut down, and produced logic levels at the output that had absolutely no relation to the...

This is a summary of the pinout information I found so far by probing my cartridges with a continuity tester. There are still a bunch of unknown pins, but this should help people looking to diagnose connection problems. I'll update this if any new info gets discovered. (Could an admin pin this...

I bought myself an Elegoo Mars, which is a "UV" curing resin printer. You are supposed to clean and harden the final print in direct sunlight, which is a bit of a problem right now in winter. I tried using an old UVA face tanning light and got only poor results. Apparently the resign doesn't...

Does anyone have a suggestion where to get Japanese home computers? I'm interested in buying an FM-Towns-II, specifically the model with the vertical CD-Drive: https://en.wikipedia.org/wiki/FM_Towns#/media/File:FMTOWNS_2F.jpg I don't need the monitor, though keyboard and mouse should be...

A colleague asked me about adding games to a Pandora "3D games" box, no idea if it is "original" or a "clone" (...as they are pretty much all an ARM SoC running the same emulators). It has the name "AUS" molded into the case. The manual mentions a hardcoded games database...

Tempting... though I have both a 1200 and 500, and an original Minimig...

This collects the information from other threads about assembling and troubleshooting my PGM single game PCBs. First of all, important: Make sure you double check the orientation of PCBs before switching on power on the motherboard! Connecting them the wrong way will cause a short circuit that...