--- On Sat, 7/9/11, Doug McNutt <[email protected]> wrote:
> I think the point is in the title of the thread. "CRT on a > 9 inch Mac". We're talking about a Mac Plus or perhaps a Mac > SE or SE/30 here. I understand. All I was pointing out was that a "composite" signal didn't have to be messy, just is in the case of a bona fide NTSC signal, which incorporated many (equivalent) bits of color info, and also information from the broadcaster oftentimes, etc. The "composite" signals delivered to sync-on-green monitors weren't anywhere close a mess. And as you pointed out the early mac's video was 1 bit in depth. > The Mac II and beyond had NuBus plug in cards to handle > video. Everything, including video RAM, was on a > plug-in card and there were lots of choices with synch > on green and NTSC both in and out were available. Synch on > green was nothing more than a blacker than black negative > pulse added to the green drive during the flyback interval. > Monitors were typically not "composite" . Apple's 15 pin > "standard" had three color coax lines and separate > horizontal and vertical synch. I couldn't tell you exactly how a sog signal was constructed, but I have added h and v syncs to the green input w/simple resistors. Aren't all sync signals "blacker then black"? All macs used negative sync pulses, the video I'm not recalling. And no Mac monitors weren't straitway composite, but many were in the sense of adding the syncs to the green (or red or blue) video input. -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/
