Search found 35 matches

by sajattack
Sun Feb 27, 2022 7:10 pm
Forum: PC 486SX (ao486)
Topic: IDE Controller Errors in Linux on AO486
Replies: 39
Views: 12502

Re: IDE Controller Errors in Linux on AO486

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...
by sajattack
Sun Feb 27, 2022 4:24 am
Forum: PC 486SX (ao486)
Topic: IDE Controller Errors in Linux on AO486
Replies: 39
Views: 12502

Re: IDE Controller Errors in Linux on AO486

Excellent work @alexoughton, just tested and my Gentoo image boots now.
by sajattack
Mon Jan 17, 2022 2:43 am
Forum: PC 486SX (ao486)
Topic: IDE Controller Errors in Linux on AO486
Replies: 39
Views: 12502

IDE Controller Errors in Linux on AO486

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...
by sajattack
Fri Jun 04, 2021 4:55 am
Forum: Other Computer / System Cores
Topic: Gigatron
Replies: 31
Views: 12254

Re: Gigatron

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.
by sajattack
Mon May 31, 2021 3:04 pm
Forum: Other Computer / System Cores
Topic: Gigatron
Replies: 31
Views: 12254

Re: Gigatron

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?
by sajattack
Wed May 26, 2021 5:04 am
Forum: Other Computer / System Cores
Topic: Gigatron
Replies: 31
Views: 12254

Re: Gigatron

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.
by sajattack
Mon May 24, 2021 8:24 pm
Forum: Other Computer / System Cores
Topic: Gigatron
Replies: 31
Views: 12254

Re: Gigatron

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)
by sajattack
Mon May 24, 2021 7:34 pm
Forum: Other Computer / System Cores
Topic: Gigatron
Replies: 31
Views: 12254

Re: Gigatron

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.
by sajattack
Mon May 24, 2021 2:56 am
Forum: Other Computer / System Cores
Topic: Gigatron
Replies: 31
Views: 12254

Re: Gigatron

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.
by sajattack
Wed Apr 21, 2021 2:26 am
Forum: Other Computer / System Cores
Topic: Nand2Tetris/Hack Core
Replies: 19
Views: 11611

Re: Nand2Tetris/Hack Core

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.
by sajattack
Mon Mar 08, 2021 4:40 am
Forum: Other Computer / System Cores
Topic: Gigatron
Replies: 31
Views: 12254

Re: Gigatron

Got controller input working today. Next up is keyboard and rom loading, then just a few finishing touches.
by sajattack
Fri Mar 05, 2021 7:38 am
Forum: Other Computer / System Cores
Topic: Gigatron
Replies: 31
Views: 12254

Re: Gigatron

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

VBf16TE.png
VBf16TE.png (5.28 KiB) Viewed 7644 times
by sajattack
Sun Jan 24, 2021 6:08 pm
Forum: Other Computer / System Cores
Topic: Gigatron
Replies: 31
Views: 12254

Re: Gigatron

tOuwByP.jpg
tOuwByP.jpg (4.24 MiB) Viewed 5146 times

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.
by sajattack
Wed Dec 23, 2020 2:03 am
Forum: Other Computer / System Cores
Topic: Gigatron
Replies: 31
Views: 12254

Re: Gigatron

I'm working on porting this here: https://github.com/sajattack/Gigatron_MiSTer
by sajattack
Fri Jul 03, 2020 2:58 am
Forum: Other Computer / System Cores
Topic: Nand2Tetris/Hack Core
Replies: 19
Views: 11611

Re: Nand2Tetris/Hack Core

Sorg didn't want it on Main last time I asked.
by sajattack
Sun Jun 28, 2020 3:44 am
Forum: Other Computer / System Cores
Topic: Nand2Tetris/Hack Core
Replies: 19
Views: 11611

Re: Nand2Tetris/Hack Core

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...
by sajattack
Tue Jun 23, 2020 4:09 pm
Forum: Development for MiSTer
Topic: General HDL questions
Replies: 8
Views: 5810

Re: General HDL questions

If you see something like "inferred latch" in your synthesis logs, that's how you know you goofed.
by sajattack
Sun Jun 07, 2020 3:34 am
Forum: Development for MiSTer
Topic: How to open project from MiSTer Github
Replies: 5
Views: 4228

Re: How to open project from MiSTer Github

Which version of quartus are you using? Needs to be 17.0.2.
by sajattack
Wed Jun 03, 2020 9:50 pm
Forum: Other Computer / System Cores
Topic: Nand2Tetris/Hack Core
Replies: 19
Views: 11611

Re: Nand2Tetris/Hack Core

Haha don't get too excited yet.
by sajattack
Wed Jun 03, 2020 2:06 pm
Forum: Other Computer / System Cores
Topic: Nand2Tetris/Hack Core
Replies: 19
Views: 11611

Re: Nand2Tetris/Hack Core

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.
by sajattack
Fri May 29, 2020 5:47 pm
Forum: Development for MiSTer
Topic: Debugging/simulation?
Replies: 9
Views: 6602

Re: Debugging/simulation?

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.
by sajattack
Fri May 29, 2020 8:19 am
Forum: Other Computer / System Cores
Topic: CHIP-8 Core
Replies: 7
Views: 4881

Re: CHIP-8 Core

Moondandy wrote: Wed May 27, 2020 12:55 am What should the folder be called to put games into?
Chip8
by sajattack
Fri May 29, 2020 8:12 am
Forum: Other Computer / System Cores
Topic: Nand2Tetris/Hack Core
Replies: 19
Views: 11611

Re: Nand2Tetris/Hack Core

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...
by sajattack
Fri May 29, 2020 2:39 am
Forum: Development for MiSTer
Topic: Learning to develop a new MiSTer core
Replies: 27
Views: 18997

Re: Learning to develop a new MiSTer core

Sorry, my git was ignoring that file. Fixed. You'll want to set it up to generate an rbf, not a sof.
by sajattack
Mon May 25, 2020 7:57 pm
Forum: Development for MiSTer
Topic: Learning to develop a new MiSTer core
Replies: 27
Views: 18997

Re: Learning to develop a new MiSTer core

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 ...
by sajattack
Mon May 25, 2020 12:45 am
Forum: Development for MiSTer
Topic: Learning to develop a new MiSTer core
Replies: 27
Views: 18997

Re: Learning to develop a new MiSTer core

This thread should probably be under "Development For MiSTer", also check this out https://www.youtube.com/watch?v=eyb_ONDubcU
by sajattack
Sun May 24, 2020 10:49 pm
Forum: Game Boy, Game Boy Color
Topic: No Sound via HDMI
Replies: 25
Views: 22598

Re: No Sound via HDMI

It happens for me when sync changes too much. Maybe set the sync option on gameboy core if you haven't already.
by sajattack
Sun May 24, 2020 10:41 pm
Forum: Atari ST / STe
Topic: Unmount a Harddisk Image [Solved]
Replies: 6
Views: 6018

Re: Unmount a Harddisk Image [Solved]

I think select the entry then backspace.