NED8LED card

A project log for NED8PC

Altair 8800-style amateur 8-bit computer

michalMichal 05/25/2024 at 05:370 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.