• NED8E4R60 - memory card

    Michal • 11/21/2024 at 05:37 • 0 comments

    It is a card containing 60kB of RAM and 8kB of EEPROM, divided into two banks of 4kB switched by a jumper on the board.

  • VGA VIDEO card

    Michal • 08/18/2024 at 13:04 • 0 comments

    The card offers a monochrome display in text mode of 80 characters per 24 lines and graphics with a resolution of 480 x 288 pixels.


  • Serial port

    Michal • 07/14/2024 at 12:41 • 0 comments

    Serial port card at 9600bps. More information on the website ARZE.cz

  • 1.program

    Michal • 05/26/2024 at 05:01 • 0 comments

  • NED8LED card

    Michal • 05/25/2024 at 05:37 • 0 comments

    First output card to test the functionality of my NED8PC computer.

    The card contains only the most important components: 8 LEDs with resistors, a 74HCT574 output latch and an address decoder consisting of 75154 (54145 - 1 of 16 decoder), 74LS32 (4x OR) and 74LS14 (6x NEG). And of course a couple of 100nF capacitors.

    The address of the card is 00h and is addressed as an output device by the OUT instruction.

  • New front panel labels

    Michal • 05/11/2024 at 03:12 • 0 comments

    I made some progress and at least printed new labels on the front panel.

  • NED8CPU - CPU Z80 card

    Michal • 03/24/2024 at 04:05 • 0 comments

    The card itself contains a CPU UA880D which is a clone of the Z80 CPU operating at up to 4MHz. Furthermore, an oscillator with a frequency divider with the possibility of adjustment with a jumper. And a reset circuit.

    Unfortunately, I didn't avoid using wire jumpers, which also have to be this long due to an error in the design (I didn't make holes for them). In addition, I chose the wrong spacing of the CPU socket, so I also made a reduction.

  • NED8PC is sponsored by PCBway!

    Michal • 03/13/2024 at 03:47 • 0 comments

    Thanks to PCBway, I was able to make a professional PCB for another card, the NED8CPU.

    The card is double-sided, metallized, including printing, and was at home within 2 weeks of ordering.

    Now I will install and test :-)

  • NED8RAM64 card

    Michal • 02/26/2024 at 04:13 • 2 comments

    This is a card with 64 KB of RAM memory.

  • NED8DMA-VYP card

    Michal • 12/24/2023 at 04:31 • 0 comments

    I finished the DMA memory write card and faceplate


    The labels on the front panel are still provisional.