Search found 1174 matches

by CunningFellow
Sun Sep 16, 2018 8:37 pm
Forum: Hardware
Topic: Trying to burn the bootloader
Replies: 14
Views: 3106

Re: Trying to burn the bootloader

The LED is turned on by the ATMega644. So no program inside chip = no LED. Your cheapest way out it probably an USBISP programmer from AliExpress or eBay. Should be sub $2 and that will be one less thing to worry about. The USBISP is a open source AVR programmer that uses the OBDEV software USB libs...
by CunningFellow
Sat Aug 25, 2018 8:56 pm
Forum: General Discussions
Topic: Uzebox 10th Anniversary!
Replies: 7
Views: 3089

Re: Uzebox 10th Anniversary!

Uze, I certainly have to say thanks for making the Uzebox and sharing it 10 years ago. There were two things that made the Uzebox special and stand out from the other projects bit banging video. First it was very well done and very clean. Secondly and more importantly – you made documentation, a web...
by CunningFellow
Mon Aug 20, 2018 5:42 am
Forum: Programming & Software
Topic: Figuring out the ATmega644 UART
Replies: 2
Views: 1319

Re: Figuring out the ATmega644 UART

Oh - And yes - I have to restart the UART "timer" every scanline. This is not only because the period is 1304 (not 1820) but also because it does not self-retrigger like the output compare timer.
by CunningFellow
Sun Aug 19, 2018 10:38 pm
Forum: Programming & Software
Topic: Figuring out the ATmega644 UART
Replies: 2
Views: 1319

Re: Figuring out the ATmega644 UART

This is the comments from my code. This was done 12 months ago so other parts are from my memory. I also didn't know why 1304 clocks (with the given baud rate/data length) but worked it out experimentally. When the ISR was triggered I made a copy of the return address on the stack and printf'd that ...
by CunningFellow
Thu Aug 16, 2018 5:12 am
Forum: Hardware
Topic: The quest to a portable Uzebox - update!
Replies: 201
Views: 42408

Re: The quest to a portable Uzebox - update!

Looks fabulous.
by CunningFellow
Thu Aug 16, 2018 5:10 am
Forum: Programming & Software
Topic: Five clock per pixel RLE mode
Replies: 37
Views: 10296

Re: Five clock per pixel RLE mode

Clever is what I do :)

Sadly quick does not seem to be what I do. Been 8 months since I made much movement on this.

I started working on a new demo for this mode this morning. Should hopefully be able to drop some jaws.
by CunningFellow
Thu Jun 07, 2018 9:26 am
Forum: General Discussions
Topic: DIFFERENCE SPEED PORTC VS PORTB
Replies: 4
Views: 1392

Re: DIFFERENCE SPEED PORTC VS PORTB

I'm pretty sure at a hardware level PortB and PortC are just as fast as each other when using OUT in ASM.
by CunningFellow
Sat Jun 02, 2018 5:51 am
Forum: Programming & Software
Topic: SPI Ram Video Mode
Replies: 39
Views: 10597

Re: SPI Ram Video Mode

How many clock cycles do you think you could do inverse discreet cosine transforms and hufman encoding.

(I am half being silly here)
by CunningFellow
Sat May 19, 2018 9:31 pm
Forum: Programming & Software
Topic: Mode 52: 2bpp square pixels with scrolling & sprites
Replies: 23
Views: 6808

Re: Mode 52: 2bpp square pixels with scrolling & sprites

Impressive resolution, this one could be really useful for the right situation! Agreed. I think the right situation could be ports of Amstrad CPC mode1 games particularly the Isometrics like Knight Lore, Head Over Heals, or the one I wanted to d Spindizzy. That was why I had my eye on 2BPP 5Clock m...
by CunningFellow
Wed May 16, 2018 2:23 am
Forum: Programming & Software
Topic: Mode 52: 2bpp square pixels with scrolling & sprites
Replies: 23
Views: 6808

Re: Mode 52: 2bpp square pixels with scrolling & sprites

Again - you are a coding machine.

Great work. And it is in my favorite 5clk per pixel aspect ratio :)