Page 3 of 3 FirstFirst 123
Results 21 to 22 of 22
  1. #21
    25+ Posting Member


    BushPilotWannabe's Avatar
    Join Date
    Jan 2014
    Location
    Alberta, Canada
    Posts
    63
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: PDP11 for full flight simulator in '70-'80s

    With the low cost of Pro Mini clones, I was thinking that one may be a reasonable substitute for 8 or 9 74HC595 shift registers. I have run a Mega329P dip package on a breadboard running SEVSEG to drive 8 seven segment displays controlled via IIC from an Arduino MEGA1128. The setup was not scoped to confirm that the segments were multiplexed but the numeral 1 and numeral 8 were the same brightness using resistors on the common anode pins only. The literature says that processing in the background is possible but I do not know how much. It may be worth further investigation.

    Hugh
    ---CYXD ----- TWR --- GND ------ Closed
    ILS-- NDB -- 119.1 -- 121.9 ---- 11/2013

  2. #22
    75+ Posting Member
    Join Date
    Aug 2010
    Location
    Norway
    Posts
    123
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: PDP11 for full flight simulator in '70-'80s

    You said only 8-9 shift registers... I need a lot MORE!!! In fact, I need 100 of them with fast update rate. I have solved the issue with 74HC595 and RS-232 communication.I will be using 2x 4-16 demultiplexer to get 16*16 values. That is to select which logic flip flop that I shall write to or read which is a much better way because I can select which logic flip flop shall be updated than updating the whole of '595s.I will be using USB to SPIhttp://no.rs-online.com/web/p/multiprotocol-transceivers/7617204/to get the input/output very fast. With that method, I will be able to communicate 100 times faster than 115.200 baud rate that is maximum in RS-232 standard.

Page 3 of 3 FirstFirst 123