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CP297s

ZX97 plus AY sound on a CP200s case

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Printed circuit board for ZX97 designed to fit into a CP200s cabinet
Provides AY-3-8910 PSG.
Provides Video with backporch generation and Audio on the former RF TV jack.
EAR jack provides EAR/MIC functions.
Former MIC jack provides Pseudo Stereo. No plug inserted at this jack provides MONO audio output at former TV jack altogether with video.
Former KEYBOARD, POWER SUPPLY, VIDEO MONITOR, JOYSTICK connectors were maintained in their original position.
  • Components Location

    danjovic10/22/2019 at 01:42 0 comments

    Uploaded to Github the components location on the board.

  • Hey, Wait! You too Ace!

    danjovic08/08/2019 at 22:35 0 comments

    Note to myself:

    If I ever going to build an Ace, I will need to add a diode between Z26A pin 3 and Z80 /WAIT line 

  • Hey, wait!

    danjovic08/08/2019 at 03:10 0 comments

    I have found one issue with the original ZX97 lite schematic: The /WAIT line is connected to an ordinary output pin rather than an Open Collector.

    A peripheral device  (like my keyboard adapter ) would fail to bring down the /WAIT line to hold the Z80.

    I have fixed that on my design with a diode and a pull up resistor


  • More updates... release candidate?

    danjovic08/07/2019 at 20:34 0 comments

    - Added a resistor network for pulling up keyboard input buffer pins (U16). I believe that will fix the erratic behavior when using buffer chips with other technology than LS.

  • Some updates

    danjovic07/23/2019 at 03:49 0 comments

    Some updates:

    • Added a notch to the PCB outline;
    • Moved the battery socket to reduce mechanic interference with DIN monitor connector;
    • Added a switch to allow the use of RAM mapped ROM;
    • Added support for external Kolour: Signals to DIN Monitor connector changed to +5V, GND, RAW_VIDEO and C_SYNC;

View all 5 project logs

  • 1
    Start by the shorter components

    First components to be soldered on the board should be the ones that are shorter in height.

    Start by the resitors.

    Then add the diodes

  • 2
    Then add the IC sockets

    And solder the P2 Jacks


  • 3
    Next solder the capacitors

    First the ceramic and polyester capacitors

    Followed by the electrolytics

View all 7 instructions

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jacksonmeade951 wrote 06/18/2020 at 11:27 point

Where did you print the board?

  Are you sure? yes | no

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