E: Shift Registers as Delay Lines (was Delay lines in TV

Rod Smallwood RodSmallwood at mail.ediconsulting.co.uk
Fri Dec 21 02:23:11 CST 2007


Now that sounds familiar. Two for an 80 character line (8bits) 7 bits
for the ASCII code and one for the extending under line cursor. 48 for
24 lines = six rows of eight on the board. Add address counters etc. 
Yup that could have been it.

Rod
  

-----Original Message-----
From: cctech-bounces at classiccmp.org
[mailto:cctech-bounces at classiccmp.org] On Behalf Of Steve Thatcher
Sent: 20 December 2007 20:18
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: E: Shift Registers as Delay Lines (was Delay lines in TV

actually Texas Instruments had a quad 80 bit MOS shift register package
available in the early to mid seventies. I had used two of them for a
frame buffer on a CRT controller design I did. The part number was
TMS3409 I believe and it was something I got from the surplus market.

-----Original Message-----
>From: Chuck Guzis <cclist at sydex.com>
>Sent: Dec 20, 2007 10:40 AM
>To: cctalk at classiccmp.org
>Subject: E: Shift Registers as Delay Lines (was Delay lines in TV
>
> From: "Rod Smallwood" <RodSmallwood at mail.ediconsulting.co.uk>
>
>> I actually worked on VDU's that used shift registers as the display 
>> memory around 1973.







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