3D printer MakerFarm Prusa i3 8″

Categories: 3D printer, My Projects
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Published on: 13/08/2014

It was always a problem to find a proper enclosure for my devices. So, I decided to build a 3D printer for these purposes. It is a great project to build. It can be used not only for customised enclosures but for all sorts of other projects. I didn’t want to buy a pre-build printer[...]

AGAT-7. Rev.0 summary and start of Rev.A design.

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Published on: 01/05/2013

I’m about to finalise my Rev.0 of the modern replica of the retro-computer “AGAT-7”. The next step will be Rev.A design with fixed mistakes, improvements and some new ideas. In this post I’m going to summarise the Rev.0 experience and share with you with some ideas for Rev.A. At the moment the Rev.0 computer starts[...]

Clock generation in FPGA with phase accumulator. Calculation and limits.

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Published on: 13/04/2013

In my project of a modern replica of a retro computer “Agat-7” I needed to generate several different clocks. Some of them can be produced by the PLL built in FPGA, others are a simple division of the main clock. But there is another group of clock signals that are not as simple to get.[...]

Hobby electronics lab

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Published on: 28/03/2013

I organised a temporary place for my hobby when I moved the house. It quickly became a mess because it didn’t have any drawers or shelves there. So, finally, I’ve decided to build a decent place for my home lab. I didn’t want to spend a lot of money on it but I needed something[...]

Launching “HALO 2 for Windows Vista” on Windows 7

Categories: Software
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Published on: 20/01/2013

My son got XBOX before Christmas and I couldn’t resist trying it. So, now I have some rest from my electronics hobby. Apart of this I’m building my hobby working place instead of the messy temporary one that I’ve used. I’ll do a post about it as well when it is done. So, after I[...]

Review of LCR-F meter from Dr. Le Hung

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Published on: 20/12/2012

Some time ago I’ve got an old computer for free. Nothing happened when I tried to turn it on, so I assumed that the power supply is broken. It is a small IBM computer in a horizontal desktop case. It has a power supply integrated on motherboard. There are some capacitors that look damaged, so[...]

Agat-7. Rev.0. CPU, memory and joystics

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Published on: 03/10/2012

Let’s go to the following part of the schematic. Today it is the CPU, the SRAM and the joysticks. Here it is: “Agat-7″ has 96Kb of RAM, so we need 128Kb SRAM chip. We can use 128K x 8bit or 64K x 16bit chips. The second option requires 9 more FPGA pins to connect but[...]

Logic probe with sound indication

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Published on: 29/09/2012

I need a logic probe to troubleshoot some of my designs. I didn’t want to reinvent a wheel, so I checked the existing designs. I found that the design from talkingelectronics.com is most suitable for my needs. The main benefits of this design are sound indication and 3rd LED (for pulses). It is possible to[...]

Agat-7. Rev.0. Floppy-drives emulators.

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Published on: 17/08/2012

At the moment I’ve completed the schematics and I’ve started to work on PCB layout. There are going to be some changes caused by discovered mistakes or better layout. So, please, treat it as a draft on this stage. Please, let me know if you notice any mistakes. Today we will have a look at[...]

Agat-7. Rev.0. Video output.

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Published on: 01/08/2012

I’ve spend some time to debug STM32L based 140K “floppy-drive” for my “Agat-7” replica project. It is already perfectly workable in read only mode. I transferred it to SPI interface to save some FPGA pins and now I need only 5 pins instead of 12. For 840K floppy drive it will save even more pins.[...]

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