Search found 8 matches

by olin
Sat Jun 08, 2019 8:59 pm
Forum: Uzebox Derivatives & open source consoles
Topic: 32blit handheld
Replies: 3
Views: 2023

Re: 32blit handheld

Did not know about Pokitto (thanks for the link), but there is quite similar (at least visually) handheld from Hardkernel: Odroid-Go https://www.hardkernel.com/shop/odroid-go/
by olin
Fri Jun 07, 2019 9:28 pm
Forum: Uzebox Derivatives & open source consoles
Topic: 32blit handheld
Replies: 3
Views: 2023

Re: 32blit handheld

Looks good, but for half of the price one can have NDS lite (on ebay) with opensource SDK and plethora of interesting games. It reminds me other popular open source consoles from the past (Dingoo A320 or GP32x and others) - 32blit does not seem to be that much different. Still it's nice there's peop...
by olin
Tue May 28, 2019 11:30 pm
Forum: Uzebox Derivatives & open source consoles
Topic: MicroDuo if ever (2 x ATmega1284 system)
Replies: 13
Views: 6412

Re: MicroDuo if ever (2 x ATmega1284 system)

I like the idea of dedicated 'GPU'. What about adding a dedicated video SRAM that would work as RAMDAC? The tiles would be loaded to Video SRAM (rather than the GPU RAM itself) and the GPU would render pixels by sending 'read' addresses to the VSRAM, which would output the values on the 8bit data ou...
by olin
Tue May 28, 2019 10:32 pm
Forum: Uzebox Derivatives & open source consoles
Topic: Pozitron
Replies: 10
Views: 4101

Re: Pozitron

Did you implement pgm_read_word, or just pgm_read_byte? That expects to read 16 bits, that might explain why the timer wasn't correct in Bugz. Bingo! the implementation was there (would not be able to link otherwise), but it was incorrect. It naively expected the parameter is a pointer to u16 rathe...
by olin
Mon May 27, 2019 11:26 pm
Forum: Uzebox Derivatives & open source consoles
Topic: Pozitron
Replies: 10
Views: 4101

Re: Pozitron

Thanks for the tips. Bugz game does work, with small glitches: the timer at the top of the screen starts from 44 instead of 300 (300 - 256). The other small issue is fading which is not implemented in Pozitron's code. How does the fading work in Uzebox? I can see the fading code in the kernel source...
by olin
Mon May 27, 2019 5:50 pm
Forum: Uzebox Derivatives & open source consoles
Topic: Pozitron
Replies: 10
Views: 4101

Re: Pozitron

Update: non-scrolling vmode3 now seems to (kind of) work. Tested on Arkanoid demo. I've compiled LodeRunner demo as well, but it does not work properly (yet). The graphics look OK in LodeRunner, it's just the main character (player) is not displayed and the enemies all run to the single spot on top ...
by olin
Thu May 16, 2019 8:20 am
Forum: Uzebox Derivatives & open source consoles
Topic: Pozitron
Replies: 10
Views: 4101

Re: Pozitron

Thanks for the input. Pozitron doesn't try to emulate AVR on ARM. It implements the Uzebox API on ARM natively which means all code runs at the "maximum" possible speed given by the quality of C compiler output. As for the third party library bloat, there is indeed currently some overhead, but that ...
by olin
Sun May 12, 2019 4:15 pm
Forum: Uzebox Derivatives & open source consoles
Topic: Pozitron
Replies: 10
Views: 4101

Pozitron

Hi, new poster here, but follow uzebox forum for several years - fantastic project. I thought about building one, but realised I have too many other electronic dev-boards in my drawer, so opted to port it to one of these instead. My hardware of choice was STM32F103VET6, ARM cortex-m3, 64kbytes RAM, ...