Simple 6502 Breadboard VGA - 640x480 with 8 colours
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- เผยแพร่เมื่อ 5 ก.พ. 2025
- Here's a quick demo of my VGA circuit with 3-bit colour added back in, at 640x480. I'll follow up with more details soon when I've had time to talk through the changes I've made.
This is amazing! Hardware acceleration would be even more amazing, I would be very interested in learning how that works at a low level.
Your videos are fantastic. Thank you for sharing your work. Looking forward to the next one!
It looks really good, and with a better colour depth it will look fantastic. It's amazing what you can do with a few TTL logic chips. I think with such a high resolution some hardware acceleration is needed to make it practical unless you start using your ARM2 with it.
Yes, the 6502 suffers here in many ways that the ARM2 wouldn't - especially bus width, rate at which it can write to the bus, and general flexibility of internal maths instructions. It will be interesting to put that through its paces one day.
@@GeorgeFoot id love to see hardware accelerated drawing
Looks great.
That looks really nice !!!
Add the extra bit to get the 16 combinations.
Need more RAM, more shift registers... and more breadboards!
Votre travail est génial, continuez, c'est passionnant !
Merci beaucoup!
Its's Beautiful! Amazing job as usual. :P
very cool. video is complicated lol, i only did a uart terminal with an avr and i'm already overwhelmed
Well done, this looks great.
That looks great!
Nicely done.
Great work!
How would you support video modes that can be set by software?
To some extent the mode is already set in software, see here: github.com/gfoot/simplevga6502/blob/main/src/lib/vga.s
However this only controls the sync timings. The way the bits map to colours, the horizontal resolution, pixel clock, and double scan or not, are all determined in hardware. Some would be fairly easy to make adjustable, others not so much!
How did you interfaced with the memorycard in a 8bit computer?? Did you transmited the data serially?
I had some routines for that already at github.com/gfoot/sdcard6502 which were fairly easy to transplant into this project. It uses the SPI protocol. The fat32 routines let me just open files and read a byte at a time, so it was fairly convenient in the end.
@@GeorgeFoot okay, so byte a byte means serial. Cool as f*!
This opens a whole new world in matter of storage for a Z80 processor. And how about the speed of that data transferring, did it goes fast enough to a usable application?
Yes you can kind of see the speed there. In the video I misquoted the amount of data, it's about 150k and takes 10 seconds to load all of it.
Huzzaahh!