Search found 264 matches

by Smonson
Tue May 28, 2019 6:05 am
Forum: MONGREL EDITION (version 2)
Topic: True 16MHz Mode
Replies: 107
Views: 3272

Re: True 16MHz Mode

Mono can do 640x400, but I assume would need a new shifter to cope with moving that to 4 and 16 colours. The shifter doesn't care what the resolution is, only the colour depth. It's the MMU/Glue controlling hsync, vsync, and the number of shifter LOADs per line that decides the video frame paramete...
by Smonson
Mon May 27, 2019 3:02 pm
Forum: MONGREL EDITION (version 2)
Topic: True 16MHz Mode
Replies: 107
Views: 3272

Re: True 16MHz Mode

exxos wrote:
Mon May 27, 2019 2:11 pm
I didn't mention 800 lines, only 200 and 400...
Right, I was only mentioning it because you were talking about wanting to increase the vertical density rather than the horizontal. Since 400 lines is already possible, I assumed you meant 800 lines vertical.
by Smonson
Mon May 27, 2019 1:22 pm
Forum: MONGREL EDITION (version 2)
Topic: True 16MHz Mode
Replies: 107
Views: 3272

Re: True 16MHz Mode

You can only double the horizontal or vertical rate though - and 640x800 seems just as silly as 1280x200. Although 1280x400 in mono might be alright, it'd have the same weird aspect ratio as medium rez, only with a font that isn't designed for it. If you really wanted to get an 800-line mode, it cou...
by Smonson
Mon May 27, 2019 12:04 pm
Forum: MONGREL EDITION (version 2)
Topic: True 16MHz Mode
Replies: 107
Views: 3272

Re: True 16MHz Mode

The FPGA core for the Cyclone-II can in theory go up to nearly 1GHz. For example, the HDMI generation runs at 320MHz. It's the rest of the system that I'm worried about - the pixel clock for 640x200 is 32MHz, and for mode 0 you need 4 shifter words every 16 pixels, so that's a decently fast rate.
by Smonson
Mon May 27, 2019 11:45 am
Forum: MONGREL EDITION (version 2)
Topic: True 16MHz Mode
Replies: 107
Views: 3272

Re: True 16MHz Mode

exxos wrote:
Mon May 27, 2019 10:19 am
Medium res with 16 colours ;). Would be cool to ultimately get 640x400x16 as well :)
Med res with 16 colours is just mode 0 at double speed, and 640x400x16 is mode 0 at quadruple the speed, which is pushing your luck a bit :lol:
by Smonson
Mon May 27, 2019 9:03 am
Forum: MONGREL EDITION (version 2)
Topic: True 16MHz Mode
Replies: 107
Views: 3272

Re: True 16MHz Mode

I don't think you should go that far. The 256-colour mode is definitely working, so I'm not sure there's much other work to do, apart from hooking the clock up.
by Smonson
Sun May 26, 2019 3:26 pm
Forum: MONGREL EDITION (version 2)
Topic: True 16MHz Mode
Replies: 107
Views: 3272

Re: True 16MHz Mode

I don't have a donor machine (yet) - the chipset ICs on my ST are the QFP type. Anyway, I'm not very good at all the high-speed analogue stuff. But I can make the HDMI mod board do whatever you need! planar or chunky? It's one byte per pixel, although there's enough room in the resolution register t...
by Smonson
Sun May 26, 2019 2:32 pm
Forum: MONGREL EDITION (version 2)
Topic: True 16MHz Mode
Replies: 107
Views: 3272

Re: True 16MHz Mode

640x200x16 ;) What we need now is a shifter which can make use of the extra bandwidth ;) What needs to be done to get the HDMI mod working at 16MHz? I take it you are feeding the stock shifter with 64MHz to get it to output 32MHz to the MMU, same as Troed? I can give you a firmware file that output...
by Smonson
Sun Apr 28, 2019 11:58 pm
Forum: SOFTWARE
Topic: Hard disk driver situation confusion
Replies: 6
Views: 191

Re: Hard disk driver situation confusion

If you use an emulated ACSI, SCSI or IDE drive in Hatari, you need a hard disk driver (or EmuTOS) like on real hardware. Same with the ACSI image option in Steem SSE. Only if you use the GEMDOS HD emulation (or the corresponding feature in Steem), you don't need a driver. In that case, the emulator...
by Smonson
Sun Apr 28, 2019 2:29 pm
Forum: SOFTWARE
Topic: Hard disk driver situation confusion
Replies: 6
Views: 191

Re: Hard disk driver situation confusion

So how does TOS access the emulated drive? Does it see it as an ACSI device that behaves in a very standards-compliant way and therefore doesn't need an additional driver?