Search found 213 matches

by Janka
Tue May 28, 2019 12:07 am
Forum: Uzebox Derivatives & open source consoles
Topic: MicroDuo if ever (2 x ATmega1284 system)
Replies: 13
Views: 2543

Re: MicroDuo if ever (2 x ATmega1284 system)

The screen list which determines which render method to use for a certain line is only trip points, and the address of the function to set for the following lines. That's three bytes per trip point and we had maybe 10 trip points per screen. Not much. If RAM was really tight, one could simply not re...
by Janka
Mon May 27, 2019 9:27 pm
Forum: Uzebox Derivatives & open source consoles
Topic: MicroDuo if ever (2 x ATmega1284 system)
Replies: 13
Views: 2543

Re: MicroDuo if ever (2 x ATmega1284 system)

While I certainly appreciate the effort, it's mainly the existing games and the emulator which did it for me in 2011. Also, putting a decent game into only 60K ROM and 4K RAM requires a lot of thought and that's a whole lot of the gratification programming for the Uzebox offers. It's missing if the ...
by Janka
Fri May 17, 2019 2:13 pm
Forum: Programming & Software
Topic: New bootloader
Replies: 127
Views: 24427

Re: New bootloader

As written, I cannot reproduce the problem during download. All the cards failing do so at the game selector now.
by Janka
Sun May 12, 2019 9:46 pm
Forum: Programming & Software
Topic: New bootloader
Replies: 127
Views: 24427

Re: New bootloader

Unfortunately, I cannot reproduce the MMC speed problems. Now some cards work at both speeds without further measures, while some don't work at all. Should I be sad? Happy? :roll: (But all working cards are unhappy with ACMD41 and need CMD1 instead, still.) (I used this tutorial, by the way: http://...
by Janka
Sun May 12, 2019 12:22 am
Forum: Programming & Software
Topic: New bootloader
Replies: 127
Views: 24427

Re: New bootloader

Which games?

It may be okay for smaller chunks, the failure is roughly after 32KB. Maybe there's some buffer underrun with those cards then.
by Janka
Sat May 11, 2019 4:22 pm
Forum: Programming & Software
Topic: New bootloader
Replies: 127
Views: 24427

Re: New bootloader

Janka: I tried out the MMC patched version, however for some reason it behaves really odd (at least in the emulator). It works, but really slow, at the moment I have no idea why (this happens even when I use the hex you provided). I wanted to add the patch to the master repo so it existed as an opt...
by Janka
Fri May 10, 2019 3:14 am
Forum: Programming & Software
Topic: New bootloader
Replies: 127
Views: 24427

Re: New bootloader

My wild guess is those ._ files are the resource streams. FAT does not support multiple streams per file but MacOS wants to store some metadata along which each file so it creates that crap. I also found it in archives made on Macs.

Simply ignoring dotfiles should help. How do we do that in 3 byte?
by Janka
Thu May 09, 2019 2:13 am
Forum: Programming & Software
Topic: New bootloader
Replies: 127
Views: 24427

Re: New bootloader

Maybe he could do an image of the first megabyte of the card with dd and upload it somewhere?

Code: Select all

$ diskutil umountDisk /dev/disk2
$ dd if=/dev/disk2 of=image.dd bs=1m count=1
by Janka
Sat May 04, 2019 12:27 am
Forum: Programming & Software
Topic: New bootloader
Replies: 127
Views: 24427

Re: New bootloader

Jubatian wrote:
Fri May 03, 2019 5:39 pm
I even have 256Mb cards here which are SDHCs, so would fail with the old bootloader or most of the games.
Well yes. Exactly what happened to me. Those MMCs I found had been a problem solver.
by Janka
Fri May 03, 2019 3:45 pm
Forum: Hardware
Topic: USBtinyISP issue
Replies: 9
Views: 790

Re: USBtinyISP issue

The device id does not match. This looks like crosstalk. You should check the soldering, and if you had a scope at hand, the rising edges of the signals.