John Carlsen's C128 80-column Video Digital-to-Analog Converter was released at CommVEx v11 2015 last weekend. Along with Jason Wright who released his CGA-to-RGB adapter, John's device was shown to the crowd and to the videocamera. Expect their videotaped talk to be posted soon! John's C128 VGA adapter was sold at a CommVEx price of $40 US, discounted from its on-line price of $50. It works in conjunction with the Gonbes GBS-8220 video converter which is not included in the price but is available from eBay with prices as low as $18.59 currently.
John's C128 VGA adapter webpage has been updated with the latest photos - www.bit-c128.com . Contact John at the e-mail link there.
I look forward to the video... at first I was thinking $40 would be a great price... but if you have to buy a GBS-8220, then it is not so fantastic (yet, still reasonable). I guess the only problem is for PAL users... I've heard from others (no PAL monitor I can test in reality) is GBS-8220 often fails for PAL users... I have heard that GBS-8200 may be better, but like I said, I have no PAL monitor to test.
Anyway, this sounds like good news for NTSC users.
I look forward to the video... at first I was thinking $40 would be a great price... but if you have to buy a GBS-8220, then it is not so fantastic (yet, still reasonable). I guess the only problem is for PAL users... I've heard from others (no PAL monitor I can test in reality) is GBS-8220 often fails for PAL users...
Right, the Gonbes GBS-8220 does not support support 50 Hz. PAL frequencies. However, the older, no-longer-produced C128 Video DAC by Fascination Software was tested with not only the GBS but also the Ambery AV-1 which supported NTSC and PAL frequencies. So, somebody has to test the new C128 VGA adapter with the Ambery to see if it is compatible.
I´m using a GBS-8220 successfully on PAL with my Richard42-board. I´ve had a defective GBS-8220 before that did not work on either PAL or NTSC. I think "the GBS-8220 does not work on PAL" is a myth. This could easily be debunked since the VDC can be put into PAL or NTSC mode by software:
Set to NTSC: SYS DEC("CDCC"),32,4:SYS DEC("CDCC"),29,7:SYS DEC("CDCC"),126,0 Set to PAL: SYS DEC("CDCC"),38,4:SYS DEC("CDCC"),32,7:SYS DEC("CDCC"),127,0
Yeah, I've heard contradictory reports about GBS-8220 and PAL... some report success, some report unreliable behavior, and others report total failure. I imagine this due to different monitors being used and/or different production runs of the GBS-8220.
I can't test myself, but thanks for the NTSC/PAL code, Tokra, so everyone else may experiment!
Thanks for the photos, RobertB... "a picture says more than a thousand words!"
I am TOTALLY amazed that the new VGA adapter is smaller than older/simpler Video DAC...
Well, after closer examination, it seems the new VGA adapter uses fewer ICs ("chips")... both use smaller "surface mount" resistors.
In fact, the "simple" Video DAC seems to use 4 ICs but the "more advanced" VGA Adapter uses only 1?
Amazing! And that explains to me (everyone else, debate all you like) why the new VGA Adapter is smaller. I really don't see how one small IC can do everything of the 4 ICs in the old (Video DAC)... I need to investigate...