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User Comment
Submitted by tokra on 23 June 2011
| With Mike's permission I added a download link for the source code of the graphics-converters. vdc_quant.c is for VDC-FLI, ivdc_quant.c is for VDC-IHFLI |
User Comment
Submitted by chatGPZ on 16 June 2011
| a c128 can run c64 programs. same reason for why we have dtv and not vic-20. |
User Comment
Submitted by tokra on 16 June 2011
The explanation for the brown/dark yellow issue can be found here:
http://en.wikipedia.org/wiki/Color_Graphics_Adapter#With_an_RGB..
Essentially brown is used instead of dark yellow by design, because dark yellow looks so ugly. With simple RGBI->RGB analog conversion however you won't get brown. That's what the "brown fix"-circuitry is for. |
User Comment
Submitted by DeeKay on 16 June 2011
| Yeah, I do remember dark yellow was always kind of a bitch when making GFX for the RFO VDC parts... It showed differently on a Philips with SCART-RGB than on a 1901 with RGBi! Graham explained to me why this was, but I forgot! ;-) I just ended up using dark yellow as scarsely as possible in my GFX! |
User Comment
Submitted by tokra on 15 June 2011
To do true RGBI->RGB analog conversion you will also need to apply a fix for the color brown apart from the resistor matrix. Otherwise you just get dark yellow. This has been done before:
http://groups.google.com/group/comp.sys.cbm/browse_thread/threa..
If I wasn't a complete fool with a soldering iron, I would have tried this myself. |
User Comment
Submitted by Mr. SID on 15 June 2011
User Comment
Submitted by Mr. SID on 15 June 2011
| @DeeKay: CGA *is* RGBi. Hooking up a VGA monitor would require the DAC resistor ladder. |
User Comment
Submitted by DeeKay on 15 June 2011
| Isn't an RGBi -> RGB converter just a matrix of resistors? <:-) Should be fairly simple to build.. I remember some guys hooked up PC CGA monitors to their C128s.... |
User Comment
Submitted by MagerValp on 14 June 2011
| Thanks, looks like it has potential. |
User Comment
Submitted by chatGPZ on 14 June 2011
"a) it's extremely expensive"
hehe yes sure, even big production companies hire these devices (and even then its expensive)
"it doesn't support digital RGBI - haven't found a converter which does yet. This means I will need to do RGBI-RGB analogue conversion first."
correct - and we actually built a rgbi to rgb converter because of said request :) |
User Comment
Submitted by tokra on 14 June 2011
I've put up some screenshots for 5 of the 14 pictures here:
http://www.tokra.de/c128/vdc-ihfli/
These are literally photographs of my 1901 taken with a camera.
Groepaz: Nope, I don't think I was the one asking about C128 recording. What I could find of the Imagepro is a) it's extremely expensive and b) it doesn't support digital RGBI - haven't found a converter which does yet. This means I will need to do RGBI->RGB analogue conversion first. |
User Comment
Submitted by chatGPZ on 14 June 2011
ah, so you were they guy who asked about c128 recording capabilites ? :) if you can, bring your stuff next time - it'd be interesting to see how the imagepro can deal with it =)
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User Comment
Submitted by MagerValp on 14 June 2011
I do have a C128DCR with 64k and a 1901, but it's in storage until August...
Screenshots? |
User Comment
Submitted by DeeKay on 14 June 2011
| haha, yeah, recording RFO for the bigscreen proved to be quite a task (but we knew it would be beforehand! <:-) IIRC we used a very rare VCR that can record RGB-SCART and then used a SCART-Cable on the C128. And even then, the sync was quite shaky, it always took a few frames to re-synchronize whenever Graham switched modes!... Btw: The VIC stuff messing with the rasterbeam via $d030 was just as bad if not worse! ;-) |
User Comment
Submitted by tokra on 14 June 2011
Thanks! The hardware requirements are a little tough right now: C128 with 64K VDC-RAM and a Commodore 1901 monitor. I suppose only the C128-elite will meet those :)
I'm still trying to figure out if and how this can be displayed on a large screen. Right now both modes look rather horrible using a CGA->VGA-converter. Remember how you did it back in 2001 and the Mekka & Symposium?
I had the modes finished before the Revision Easterparty this year, but couldn't fit the C128 and monitor together with three people and baggage in my car. Since I would be unable to show these on the large screen anyways, I held those back until now. |
User Comment
Submitted by DeeKay on 14 June 2011
| Wow, very nice! 8) I really gotta dig out my c128 to check out how this looks on real HW.... |
User Comment
Submitted by Lynx on 13 June 2011
User Comment
Submitted by Thunder.Bird on 13 June 2011
| absolutely fabulous! out-of-words |
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