My Z80 Homebrew Computer

My Z80 Homebrew Computer


This is my oldschool homebrew computer’s first
functional mainboard. In the middle there is Z80 processor, which
was introduced in the 1970s. It’s just a processor and it needs external
memory. For storing the programs, there is ROM mounted
in ZIF socket. On the other side of the CPU, there is RAM. I am using 555 timer to create a clock signal
for the processor. Z80 can run at few megaherz, but I’m using
way slower clock signal while debugging everything. Later on I will add faster clock and a switch
that allows switching between it and this slower clock. Building the hardware part of these Z80 homebrew
computers is not hard at all for the most parts. Apart from little bit of address decoding,
it’s mostly just wiring pins with same names together between the different ICs… That is slightly simplified, but not too far
from the truth. I’m not going too deep into this, as this
is not ment to be a tutorial video. There is pin header that I will use when I’ll
add peripherals to this computer. Little bit of empty space was left on this
mainboard for faster clock, regulator and other “must-have” parts. Things like serial port, GPIO pins, displays
and other peripherals will be added as expansion boards. This is my first project involving these old
microprocessors and programming with assembly. I’m not making these videos to share step
by step instructions to you, but rather to show and tell what I’ve got and hopefully
give inspiration to someone. I would be happy to hear about YOUR homebrew
computer projects. What I will do next with this, when it will
happen and how many videos I will make about this project? I have no idea… Thanks for watching. I’m sure you know how to like this video and
subscribe if you want to do so. Thanks, bye!

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