MiSTer FPGA Forum

Glad to hear it @sajattack. Thank you as well for providing the image. Having a working Linux image has been incredibly useful for the other troubleshooting I’ve been doing for NT. If you have a guide you could provide for how to compile the kernel correctly for the MiSTer, I would really appreciate it! I used this config for the kernel https://gi...

Excellent work @alexoughton, just tested and my Gentoo image boots now.

I created a gentoo linux image https://nextcloud.paulsajna.com/index.php/s/7GqsqpCCH3cBFMo for 486 without fpu, and it boots the kernel, but fails to mount the rootfs due to some IDE errors. Same image boots fine in qemu with command qemu-system-i386 -hda gentoo.vhd -cpu 486,-fpu I'm starting to think there is a bug or omission in the IDE controlle...

Thanks for the patch. One question, why did you change the clock for the keyboard from famicom_pulse to clk_app? For F12, I think ao486 uses win+f12 or ctrl+f12 or something. Maybe worth looking into. In terms of the rom loading, that's next, I want to do gt1 loading for external programs, but I can do the full rom too.

Interesting find. I wonder why it is only on the "Pictures" option though. For your menu option, did you try left and right to switch it?

pgimeno wrote: ↑Tue May 25, 2021 1:03 am I have the time, kind of, and lots of motivation. I'm still doing my first steps with Verilog but after my recent success I think I can at least help somewhat.

I'm open to pull requests on the linked repo if you think you can get it working before I have time to get back to it myself.

Enjoy folks https://github.com/sajattack/Gigatron_M ... 210523.rbf

Known issues:
- keys like shift, ctrl, alt, arrow keys on the keyboard don't work
- video is slightly offset to the right
- no external rom loading (most things are baked into the internal rom anyways)

I just need time and motivation . Do you guys want a "beta" core? The games built into the ROM are playable and I'd like to give something for your continued interest and support.

Got most of (not extended keys) the keyboard working today. Don't have a lot of time to work on this these days but I'm still getting a little bit done here and there.

It's a 16 bit machine that runs at about 1 million instructions per sec in my implementation, but the instructions are very RISC and hardly do anything. For example iirc a memory access requires two instructions. Resolution is 512x256 1bpp. 16384 16 bit words of RAM and 32768 16 bit words of instruction ROM.

Got controller input working today. Next up is keyboard and rom loading, then just a few finishing touches.

Solved the cut off video problem. Screencap from the core:

Made a bit of progress on video output with Alan's help. Still need to fix the timings/aspect ratio/etc a bit, then ROM loading and controls.

I'm working on porting this here: https://github.com/sajattack/Gigatron_MiSTer

Sorg didn't want it on Main last time I asked.

Yeah it's really quite unfortunate that the course encourages students to develop their games in a simulator with no memory restrictions. Because if you actually try to run them with the specified memory limit, they fail. I have a friend who started developing a game within the memory limits but it's unfinished. I believe it's in the repo under &qu...

If you see something like "inferred latch" in your synthesis logs, that's how you know you goofed.

Which version of quartus are you using? Needs to be 17.0.2.

Haha don't get too excited yet.

Moondandy wrote: ↑Tue Jun 02, 2020 2:37 pm Hopefully it isn't too tricky. Quite surprised no one has done it already.

It has a very unusual CPU. So not a drop-in z80 or 6502 like a lot of other cores. But it's fairly simplistic in it's operation. Should be doable.

ExCyber wrote: ↑Fri May 29, 2020 5:37 pm Nice. This didn't quite work as-is with the version of Verilator that I currently have, but it seems to cover some things that I wanted to look into. Like hooking up a "real" video output instead of filling my drive with VRAM dumps.

Uncomment line 15.

Moondandy wrote: ↑Wed May 27, 2020 12:55 am What should the folder be called to put games into?

Chip8

Pretty much the only game it runs is one player Pong. Get the Pong.bin here https://github.com/sajattack/Hack_MiSTer/tree/master/roms and place it in /media/fat/games/Hack . I was disappointed many of the games written for the platform have larger memory requirements than what are actually specified. The repository links to the website for nand2tet...

Sorry, my git was ignoring that file. Fixed. You'll want to set it up to generate an rbf, not a sof.

https://8bitworkshop.com/v3.5.1/?platfo ... l_paddle.v
https://hdlbits.01xz.net/

Same here :) I enrolled in the nand2tetris course: https://www.nand2tetris.org/ (actually the coursera edition) to close some gaps and get better understanding of the hardware. I'm almost finished with Part I (the Hardware-Part). Next step for me would be to create a template Project, meaning very general but with most possible functions built-in ...

This thread should probably be under "Development For MiSTer", also check this out https://www.youtube.com/watch?v=eyb_ONDubcU

It happens for me when sync changes too much. Maybe set the sync option on gameboy core if you haven't already.

I think select the entry then backspace.