MiSTer FPGA Forum

The A2FPGA project has some working Verilog code for IIgs functionality that might be of interest to folks working on this:

VGC for Super Hires

Ensoniq DOC 5503

Feel free to PM about it. Happy to collaborate in adapting it for use in a Mister IIgs core.

You need a rom file. You can find these in most MAME collections or on the emulator sites listed in the README. It will typically be named Interact.rom. Rename it to boot.rom and put it in on the SD card.

New core: Interact Home Computer
- Available at: https://github.com/MiSTer-devel/Interact_MiSTer
- Supports HDMI, joysticks & keyboard, loads cassettes in popular emulator formats
- Todo: Sound support

I put a link to this thread in the Dev channel in the discord (well worth joining if you aren't already). I am not a dev, but a couple of questions: are you using the latest MiSTer framework and is the core free of all copyright material i.e. a baked in BIOS file that isn't public domain? Thanks! Not using any copyrighted material. The memory init...

Moondandy wrote: ↑Sun Aug 15, 2021 12:14 pm Thanks for making and sharing this, are you planning to add it to the official MiSTer repo?

I definitely would like to. I don’t know how to go about doing that.

If you're just starting out, Designing Video Game Hardware in Verilog is not a bad place to start. It will still be a bit of a way from there to developing a recreation of an existing system but you're going to need to at least know most of the concepts in there before you can really make much progress.

SN76477 sound chip is mainly analogue which makes it difficult to do as a high level language, although if the machine only does single voice 4 octaves I guess the Interact supplies an external VCO and just use the ADSR filter, so it may be possible to knock something up for it - have you got a schematic for it ? Yes, you can see it attached. I di...

Very nice, thanks. Very primitive machine, especially considering it was released around the same time as the TI-99/4A - which was way ahead of it's time. It sort of reminds me of the Mattel Aquarius, going by some of the videos I have watched. It's machines like these that benefit from an FPGA core, it's then preserved for future generations. The...

I've created a core for the Interact Home Computer and shared it on GitHub. You can find it at https://github.com/edanuff/Interact_MISTer . I tried to follow the discrete logic of the schematics as closely as possible in my Verilog code to make it as accurate as I could. I'm still working on it but it will load and run games from the cassette file ...

Answering my own question for the next person who tries this - yes, looks like wiring up ioctl_dout, ioctrl_addr, ioctl_wr, etc. is exactly what you do.

Sorry for the noob question but hoping that someone can give me some guidance. I've been making good progress on my first core for the Mister but trying to figure out the best way to do tape loading. I''d like to read a 16 bit wav file on the sd card. What happens once I select a file via my OSD config menu? Are the file contents sent via ioctl_dou...