Search Results for “8 bit” – Page 2

8 bit computer, program counter and reset

Posted on2017-08-12

8 bit computer, program counter and reset I’m busy transitioning my 8 bit computer from the breadboards I built it on to experimental PCB’s. They will be on a bus print. Here’s the first video: … Read the rest

Work on 8 bit computer started

Posted on2017-05-15

Work on 8 bit computer started After receiving the first order of components, I started work on the clock-module for my new 8 bit computer. Two pictures: Organised chaos When working on projects there’s always a degree of organised chaos on the work-bench… Clock module Below you see… Read the rest

8 bit Computer coming soon

Posted on2017-05-13

8 bit Computer coming soon I ordered my first batch of parts with my favourite store, OKAPHONE ELEKTRONIKA. As soon as this stuff arrives, I will start the build of my own 8 bit computer out of basic parts, from the ground up! — Stay tuned, more will follow… … Read the rest

8bit computer status so far

Posted on2017-06-11

8bit computer status so far Okay, I’d like to give you guys an overview of the status of the 8bit computer build. (Also see video at the bottom of this post). The Memory modules First of, here’s the clock and the memory. I already described the clock module, the memory… Read the rest

Build your own 8-bit computer

Posted on2017-05-07

Build your own 8-bit computer I found this amazing playlist in which Ben Eater describes building an 8-bit computer in a way that really can help you understand how computers work on a deep level, from the ground up. Perhaps, when time permits, I will try this build myself…… Read the rest

FT8 data from the noise

Posted on2022-04-302022-04-30

It’s truly amazing what can be accomplished with digital modes like FT8… Noise Have a look at this waterfall, it looks like the 10 meter band is dead, it only shows a few very faint signals in the 10 meter band: Despite the weak signals, the FT8 program I use,… Read the rest

Retro Z80 computer (4) – Dual Serial Module

Posted on2021-12-15

And another one bites the dust… The Dual Serial SIO/2 module has been assembled and soldered. With this one I had to search for the value of the resistors, because the info was not in the documentation. Eventually I ended up looking at the pictures of an assembled one online… Read the rest

EEPROM Programmer

Posted on2017-06-14

EEPROM Programmer For the more complex decoding on my 8 bit computer like for example the Control Unit I will use an EEPROM, not some elaborate complex circuitry. For this I must be able to program an EEPROM. On his Youtube channel Ben Eater describes one based on an Arduino… Read the rest

Program Counter (PC) finished

Posted on2017-06-05

Program Counter (PC) finished Today, I built the program counter (PC) for my 8 bit computer. It has three control signals: CE – Count Enable PCO – PC Out (put the contents of the PC on the bus) PCI – PC In (Read the contents of the bus and store… Read the rest

Memory, registers and ALU

Posted on2017-05-21

Memory, registers and ALU For my 8 bit computer I built the A and B registers and the Arithmetic Logic Unit (the ALU). Also I’m experimenting to create 256 bytes of memory. Status The registers now work, they can put values on and accept values from the bus. The ALU… Read the rest

Antenna switches

Posted on2022-03-052022-03-054 Comments

Yesterday I ordered some antenna switches (from HAMshop, where else?) and today they came in. One is for HF and the other for VHF/UHF and higher. See pictures below. Also, I have a question for fellow HAM’s, please have a look at the bottom of this post. HF switch (PL… Read the rest

Experimenting transistor amplifiers (3)

Posted on2022-02-182022-02-25

The circuit for today Today I take it up a notch, by making a two transistor amplifier. This time I use the circuit diagram at the right (published on Jos Verstraten’s website). As a convenient touch, measuring points are given in the diagram, indicating the expected Voltages. Building the circuit… Read the rest

Cleaning mixer

Posted on2021-08-282021-09-17

I have an old audio mixer (Behringer Eurorack MX 802A) laying around. It’s been gathering dust for quite a while. In the pictures you probably can’t properly see it, but it had a lot of dust on it. Today I decided to give it some TLC and clean it up.… Read the rest

Gray line made visual

Posted on2021-07-042022-03-16

In the image below, created yesterday evening, you can beautifully see the effect of what is called the ‘gray line‘ (see explanation by Paul NA5N Harden below). It is the line between day and night, as can be seen in the image. Along this line radio connections are ‘propagated‘ by… Read the rest

Digital mode receiving

Posted on2021-05-212021-05-21

Amongst the ways we can receive (and transmit) information are the digital modes. One of the popular modes is called FT8. The program WSJT-X that I use is capable of coding and decoding that FT8 protocol. Using that program I received (and was able to decode) the stations in the… Read the rest