Shift Registers as Delay Lines (was Delay lines in TV sets)

I actually worked on VDU's that used shift registers as the display memory around 1973. If I remember correctly one lines worth (80 characters) got transferred to a buffer in the interline gap (Fly back time). The buffer was scanned out in such a way as to address the character generator one row at a time. Characters were 7x5 dots so the top five dots of the first character was serialized followed by the top row of the second one and so on. Then all of the second character row dots on a line would be displayed until the end of the store (and therefore frame was reached) New characters would join the tail end (first unused position) of the store as it went past. Rod Smallwood Sitting in my DEC chair in the SUN shine. -----Original Message----- From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org] On Behalf Of M H Stein Sent: 18 December 2007 19:28 To: 'cctalk at classiccmp.org' Subject: Shift Registers as Delay Lines (was Delay lines in TV sets) Date: Tue, 18 Dec 2007 10:03:34 +0000 From: Ethan Dicks <ethan.dicks at usap.gov> Subject: Re: Shift Registers as Delay Lines (was Delay lines in TV sets) On Mon, Dec 17, 2007 at 06:52:59PM -0500, Allison wrote: ___________ Sounds like our shopping habits were the same in those golden days at the 'shack ;-); I've still got a couple waiting for me to get a round tuit (the data sheet also has the bucket brigade audio delay schematic). As a digital delay line I guess you could even use it word-wise since it's analog; you'd need some pretty fast DAC/ADCs though. mike