Search found 1293 matches

by Jubatian
Sun Mar 17, 2019 9:19 am
Forum: Programming & Software
Topic: New bootloader
Replies: 96
Views: 14795

Re: New bootloader

I understand SDHC and FAT32 are more important to almost all people than MMC and FAT16. The old bootloader even had problems with most SDSC cards I could get my hands on. Those MMC cards came as a problem solver. To avoid the size problem, I try to tackle it with alternative source code. It's just ...
by Jubatian
Sat Mar 16, 2019 7:57 am
Forum: Programming & Software
Topic: New bootloader
Replies: 96
Views: 14795

Re: New bootloader

Does anyone experience situations when the old bootloader can detect and use a card while this new one can not? (I am still trying to go after what happens on ry775's hardware). An obvious thing could be ancient MMC cards which have no ACMD41 implemented, I am looking for anything beyond that. Yes,...
by Jubatian
Thu Mar 14, 2019 7:24 pm
Forum: Uzebox Emulator
Topic: I can't get the Uzebox emulator to run
Replies: 8
Views: 2728

Re: I can't get the Uzebox emulator to run

Hello to all ... So who is gona make a new windows a non comand line based uzem emulator / and tools ?????... :idea: :geek: ??? Would be great if someone has done this. Also keep in mind that you found a really old topic here, there are things which doesn't apply today. Like Nicksen above is mentio...
by Jubatian
Mon Mar 11, 2019 7:49 pm
Forum: Programming & Software
Topic: Game size problem with bootloader.
Replies: 8
Views: 150

Re: Game size problem with bootloader.

Hi Janka,

Yes, the hard limit is 61440 bytes (or 61952 for .uze files), I don't know why you are experiencing that problem uploading the game. Which version of the bootloader do you have by the way? There might be some bug lurking somewhere in there.
by Jubatian
Thu Mar 07, 2019 7:01 pm
Forum: Uzebox Derivatives & open source consoles
Topic: Experimentation with Adafruit ItsyBitsy M4 board
Replies: 31
Views: 1624

Re: Experimentation with Adafruit ItsyBitsy M4 board

The Game Kernel in my case is not without well-defined constraints. One is the minimal ARM specs which I aim for (and eventually probably will get onto actual hardware, until then, the BitBox driven at an appropriate clock would suffice). This minimal spec is 12 * NTSC colorburst clock (~43MHz), 273...
by Jubatian
Wed Mar 06, 2019 8:20 pm
Forum: Uzebox Derivatives & open source consoles
Topic: Experimentation with Adafruit ItsyBitsy M4 board
Replies: 31
Views: 1624

Re: Experimentation with Adafruit ItsyBitsy M4 board

How will you code all the kernels for all the differents Microcontrollers? I am approaching the problem from a different perspective. What kind of simple interface the cross-platform kernel could provide which you could easily attach to the display drive mechanism once you did it? In this particula...
by Jubatian
Mon Mar 04, 2019 7:04 pm
Forum: Uzebox Derivatives & open source consoles
Topic: Experimentation with Adafruit ItsyBitsy M4 board
Replies: 31
Views: 1624

Re: Experimentation with Adafruit ItsyBitsy M4 board

Nice and quite interesting ideas! I am working on something similar, however approaching the problem from a different perspective. I am trying to come up with an ARM game kernel which you could adapt onto any vendor's ARM, and the games for it would execute only Thumb instructions (suitable for Cort...
by Jubatian
Sun Feb 24, 2019 9:27 am
Forum: Uzebox Derivatives & open source consoles
Topic: Experimentation with Adafruit ItsyBitsy M4 board
Replies: 31
Views: 1624

Re: Experimentation with Adafruit ItsyBitsy M4 board

Update: Also juste by switching the compiler to -O1 I have now about 20 frame / second. Yikes! It is easy to bring something down to a crawl for sure by forgetting that! :lol: By the way as far as I know, the general rule with GCC is mostly using -O2 for stuff more sensitive to performance and -Os ...
by Jubatian
Sat Feb 23, 2019 10:01 am
Forum: Uzebox Derivatives & open source consoles
Topic: Experimentation with Adafruit ItsyBitsy M4 board
Replies: 31
Views: 1624

Re: Experimentation with Adafruit ItsyBitsy M4 board

Interesting. The 8 bit AVRs are great micros on terms of performance and code density, clock to clock in tasks not involving intensive wider than 8 bits math, I would expect them easily surpassing Cortex-M0 both in performance and code size. The XMegas are a bit worse than the Megas for the same clo...
by Jubatian
Wed Feb 20, 2019 9:00 pm
Forum: Uzebox Derivatives & open source consoles
Topic: Ideas around an STM32G0
Replies: 8
Views: 686

Re: Ideas around an STM32G0

Just thought to share. This is just pretty slick. void __attribute__((noinline)) test_4bpp(uint_fast32_t data, uint8_t const* pal, uint8_t* out) { 20000264: b410 push {r4} out[0] = pal[(data >> 28) & 0xFU]; 20000266: 0f03 lsrs r3, r0, #28 out[1] = pal[(data >> 24) & 0xFU]; 20000268: f3c0 6c03 ubfx i...