New Z80 minicomputer - TMS9918 video working скачать в хорошем качестве

New Z80 minicomputer - TMS9918 video working

After a long time I'm back on this project. This video demonstrate the correct working of the TMS9918 video card breadboard prototype, using a simple program that echoes the keyboard strokes on screen. The circuit is based on a well known schematic (https://retrobrewcomputers.org/n8vem-...) that has been used multiple times on other Z80 homebrew computers, like the 2014 and, last but not least, my previous Z80 computer. As I already did on my previous homebrew computer I've added to the basic circuit a flip-flop whose output is wired on the A14 PIN of the 62256 SRAM chip in order to have two different VRAM pages. Switching between the pages is done by simply writing on a I/O port.