From tweeks@texas.net Received: from texas.net (dnet02-21.sat.texas.net [206.127.4.51]) by mail1.texas.net (8.8.5/8.8.5) with SMTP id EAA08623; Wed, 17 Sep 1997 04:37:52 -0500 (CDT) From: Thomas Weeks To: "John D. Baker" CC: Thomas Weeks Date: Wed, 17 Sep 1997 21:54:06 +0500 Message-ID: In-Reply-To: <2512de6d.u8t20e.eeb86-jdb8042@blkbox.com> X-Mailer: YAM 1.3.4 [020] - Amiga Mailer by Marcel Beck Subject: Re: XCLK Buffering on CDTV MIME-Version: 1.0 Content-Type: text/plain X-UIDL: a18c9213b7fa8806b76426ec899fc1f4 Around 17-Sep-97, John D. Baker typed: >In your message, , dated Jan 21, you >wrote: >BTW, do you know if there is any buffering, etc between where >XCLK attaches to the video card slot and the Agnus? I haven't >been able to find the path between these points yet. Yes... goes through U14 (74F04 hex inv.) pins 9 (in) & 8(out), then what looks like an impedance matching network [voltage divider really]. like this: 9 8 |\ XCLK >----| >o-----R47-----+------> _XCLK to Agnus |/ | R46 [~4.2V drop] | ----- --- - R47=22ohms R46=122 Ohms Tombo -- __________________________________________________________________________ / Thomas W. Weeks |Team AMIGA Commodore Amiga 500/030 40MHz \ | A&M EET/Telecom Grad '95 | /// Hacked Into Black Tower Case, | | Authorized Amiga Tech (7yrs) | __ /// 9M RAM, SyQuest 44M, 700M-o-SCSI | | Contact Me @ | \\\/// IBM 286 Hardware Emulator, | | o------------o | \XX/ Home Brew Audio A/D, HP48GX | | Email: tweeks@texas.net |"Amiga, The Computer for the Creative Mind"TM| |Web:lonestar.texas.net/~tweeks|"Mac, The Computer for the Rest of Us"TM | \_____________________________|____________________________________________/