1. Forum
  2. Fidonet
  3. ALT.FOLKLORE.COMPUTERS

  • Re: alternative phonographs, was: Rise and Fall of Unix

    From Jason Howe@3:633/280.2 to All on Sat Jul 19 09:53:25 2025
    Reply-To: jason@smbfc.net

    On 10 Jul 2025 16:38:38 GMT, Bob Eager <news0009@eager.cx> wrote:
    On Thu, 10 Jul 2025 15:50:44 +0000, danny burstein wrote:

    1975ish Superscope, whhich was in the midst of its breakup with Sony,
    and was coming up with its own line of products,
    sent our store promo materials for an upcoming phonograph player
    which...
    varied the rotational velocity (and keeping the same linear velocity).

    This let the outer tracks of a record hold more material,
    and thus extending the playing time.

    (It never got past a couple of demo units, if even that)

    But later adopted for the CD, of course.

    And one of the modes used by laserdiscs.

    You had the CLV disks, (Constant Linear Velocity) which got you about 60 minutes per side at the cost of parlour trick of freeze-frame and what
    not. (This is like a CD)

    Then you had the CAV disks, (Constant Angular Velocity) disks which were good for about 30 minutes per side. (this is like a record). It's why I have to flip
    my Star Wars Definitive Edition 4 times over the course of the movie...

    --Jason

    --- MBSE BBS v1.1.1 (Linux-x86_64)
    * Origin: A noiseless patient Spider (3:633/280.2@fidonet)
  • From danny burstein@3:633/280.2 to All on Sat Jul 19 09:59:39 2025
    In <105empl$2b6kf$2@dont-email.me> Jason Howe <jason@tatooine.smbfc.net> writes:

    And one of the modes used by laserdiscs.

    You had the CLV disks, (Constant Linear Velocity) which got you about 60 >minutes per side at the cost of parlour trick of freeze-frame and what
    not. (This is like a CD)

    Then you had the CAV disks, (Constant Angular Velocity) disks which were good >for about 30 minutes per side. (this is like a record). It's why I have to flip
    my Star Wars Definitive Edition 4 times over the course of the movie...

    If I'm remembering my collection of units correctly,
    some of the more featured (and expensive!) LaserDisc players
    had internal memory storage so yes, you could freeze frame
    both types of disk.


    --
    _____________________________________________________
    Knowledge may be power, but communications is the key
    dannyb@panix.com
    [to foil spammers, my address has been double rot-13 encoded]

    --- MBSE BBS v1.1.1 (Linux-x86_64)
    * Origin: PANIX Public Access Internet and UNIX, NYC (3:633/280.2@fidonet)
  • From Jason Howe@3:633/280.2 to All on Sun Jul 20 02:01:42 2025
    Reply-To: jason@smbfc.net

    On Fri, 18 Jul 2025 23:59:39 -0000 (UTC), danny burstein <dannyb@panix.com> wrote:
    If I'm remembering my collection of units correctly,
    some of the more featured (and expensive!) LaserDisc players
    had internal memory storage so yes, you could freeze frame
    both types of disk.


    That sounds right.

    What I always wanted was for the dual sided players to do a read-ahead buffer or
    something for seemless side changes. That's a lot though considering the 30+ seconds it can take a player to "flip".

    Thinking about it, I guess the better option would be two independent laser assemblies, so the side B laser could pick up when side A was over. Then you could do away with the roller coaster rails for the laser to move around the disk.

    --
    Jason

    --- MBSE BBS v1.1.1 (Linux-x86_64)
    * Origin: A noiseless patient Spider (3:633/280.2@fidonet)