Search found 63 matches

by alastair
19 Sep 2022, 00:07
Forum: Hardware and software hacking
Topic: Novatron
Replies: 32
Views: 1473

Re: Novatron

Thanks for the new ROM Leo. The original card is showing three lines after the boot message. The first is all white pixels and the next two are all red. I picked up a new SD card and get three all white lines. This was the case with the card in its original FAT32 formatted state and after loaded the...
by alastair
13 Sep 2022, 22:22
Forum: Hardware and software hacking
Topic: Novatron
Replies: 32
Views: 1473

Re: Novatron

There was a bit of a trick needed to dd the image from MacOS (/dev/rdisk2). I can now copy the image and mount it correctly. The new ROM version fixes the "Vol.ID 0101" error, but I'm now getting "FAT32 FAILED". I get this error with both a clean FAT32 formatted drive and the sd....
by alastair
09 Sep 2022, 13:40
Forum: Hardware and software hacking
Topic: Novatron
Replies: 32
Views: 1473

Re: Novatron

I'm still seeing the same issue. I unzipped the file to the correct 64M size and then transferred it using dd. Once complete the card wasn't recognizable on my Mac or Windows machines, but showed the same error on the Novatron. I'll see if I can get some different cards and try those.
by alastair
08 Sep 2022, 13:00
Forum: Hardware and software hacking
Topic: Novatron
Replies: 32
Views: 1473

Re: Novatron

Thanks @lb3361. I don't have a lot of SD Cards and this was the only one I could find at short notice. Picture attached of the card and format on Mac. I had to zip the sd.bin file so it would attach (it just contains system.gt1 right now): sd-card.jpg Screen Shot 2022-09-08 at 8.38.26 AM.png sd.zip
by alastair
08 Sep 2022, 04:23
Forum: Hardware and software hacking
Topic: Novatron
Replies: 32
Views: 1473

Re: Novatron

I just received the updated board with the final fixes. Gamepad is working and also works with the ATtiny85/keyboard plugged in. I fixed the issues with the SPI and have the SD card working! I've only just finished the build and did some quick tests. Card boot is running, but it's not finding the Sy...
by alastair
20 Aug 2022, 02:09
Forum: Hardware and software hacking
Topic: Novatron
Replies: 32
Views: 1473

Re: Novatron

The controller works when the monitor isn't plugged in (verified by audio not video obviously!). Plugging in the monitor or even putting the oscilloscope probe on pin 11 and 12 of the 595 causes the issue with the bits being transposed. I wasn't able to "see" what was happening, but it see...
by alastair
19 Aug 2022, 03:37
Forum: Hardware and software hacking
Topic: Novatron
Replies: 32
Views: 1473

Re: Novatron

I think the controller issue may be a timing glitch. I was testing things out and see the bits getting transposed when plugged into a VGA monitor. I plugged in a VGA-to-HDMI adapter and issue goes away. The controller buttons are all mapped correctly, so the data is getting latched as expected. This...
by alastair
18 Aug 2022, 21:25
Forum: Hardware and software hacking
Topic: Novatron
Replies: 32
Views: 1473

Re: Novatron

I label "OUT6" as ~HSYNC in my schematic. This looks correct. I see pins 11 and 12 of the 595 connected to OUT6 on the Gigatron PCB.
by alastair
18 Aug 2022, 16:18
Forum: Hardware and software hacking
Topic: Novatron
Replies: 32
Views: 1473

Re: Novatron

I would expect that you're seeing:- [ start ] [right] [down] [left] [A] [right] [ up ] [ B ][select] [A] Yes, you are correct. I had the up and start mixed up. Holding the top button triggers the reset, so that would be the start button. Can you share a waveform of PULSE/LATCH/DATA at the 595 while...
by alastair
18 Aug 2022, 14:37
Forum: Hardware and software hacking
Topic: Novatron
Replies: 32
Views: 1473

Re: Novatron

I don't think I have a button that maps to "start". This is how the rest map.

Code: Select all


      [ up ]                                [right]
[down]      [left]                    [A/B?]      [right]
      [ ?? ]        [  ??  ][select]        [A/B?]