Project Logs

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• Components Location

  danjovic • 10/22/2019 at 01:42 • 0 comments

  Uploaded to Github the components location on the board.

• Hey, Wait! You too Ace!

  danjovic • 08/08/2019 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!

  danjovic • 08/08/2019 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?

  danjovic • 08/07/2019 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

  danjovic • 07/23/2019 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;

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