Search found 301 matches

by Smonson
Mon May 27, 2019 12:04 pm
Forum: MONGREL EDITION DEVELOPMENT & INFO
Topic: True 16MHz Mode
Replies: 111
Views: 12968

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 DEVELOPMENT & INFO
Topic: True 16MHz Mode
Replies: 111
Views: 12968

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 DEVELOPMENT & INFO
Topic: True 16MHz Mode
Replies: 111
Views: 12968

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 DEVELOPMENT & INFO
Topic: True 16MHz Mode
Replies: 111
Views: 12968

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 DEVELOPMENT & INFO
Topic: True 16MHz Mode
Replies: 111
Views: 12968

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: 943

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: 943

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?
by Smonson
Sun Apr 28, 2019 1:11 pm
Forum: SOFTWARE
Topic: Hard disk driver situation confusion
Replies: 6
Views: 943

Hard disk driver situation confusion

I'm very confused by the ACSI hard disk situation. I can see that there are many drivers available, with various featuresets. Could someone answer a very basic question for me? How come a hard disk driver isn't needed when using an emulated hard drive in Steem or Hatari? Does TOS already have the bu...
by Smonson
Thu Apr 25, 2019 2:24 am
Forum: MONGREL EDITION DEVELOPMENT & INFO
Topic: Flashy Clock - Yet another DEV board
Replies: 221
Views: 19362

Re: Flashy Clock - Yet another DEV board

exxos wrote:
Wed Mar 20, 2019 10:52 pm
Of course if anyone is good at GEM programming it would make life a whole lot easier.
I have no idea what I'm doing, but I volunteer!
by Smonson
Mon Apr 08, 2019 1:44 pm
Forum: HARDWARE DISCUSSIONS
Topic: Sidequest: VGA scan doubler
Replies: 20
Views: 2221

Re: Sidequest: VGA scan doubler

Thanks Exxos, I couldn't have made it this far without all your support and help!

I'll investigate those synchronous counters. That sounds like exactly could be needed (whether discrete or inside the FPGA).

Go to advanced search