AGAT-7. Rev.0 summary and start of Rev.A design.
I’m finalising my Rev.0 of the modern retro-computer “AGAT-7” replica. The next step will be Rev.A design with fixed mistakes, improvements, and new ideas. In this post, I’m going to summarise the Rev.0 experience and share with you some ideas …
Clock generation in FPGA with phase accumulator. Calculation and limits.
In my project of a modern replica of a retro computer, “Agat-7”, I needed to generate several clocks. The PLL built-in FPGA can produce some of them; others are a simple division of the main clock. But another group of …
Hobby electronics lab
I organised a temporary place for my hobby when I moved the house. It quickly became a mess because it had no drawers or shelves. So, finally, I’ve decided to build a decent place for my home lab. I didn’t …
Launching “HALO 2 for Windows Vista” on Windows 7
My son got XBOX before Christmas, and I couldn’t resist trying it. So, now I have some rest from my electronics hobby. Apart from this, I’m building my hobby working place instead of the messy temporary one I’ve used. I’ll …
Review of LCR-F meter from Dr. Le Hung
Some time ago I got an old computer for free. Nothing happened when I tried to turn it on, so I assumed that the power supply was broken. It is a small IBM computer in a horizontal desktop case. It …
Agat-7. Rev.0. CPU, memory and joystics
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 a 128Kb SRAM chip. We can use 128K x 8bit …
Logic probe with sound indication
I need a logic probe to troubleshoot some of my designs. I didn’t want to reinvent the wheel, so I checked the existing designs. I found that the design from talkingelectronics.com is most suitable for my needs. The main benefits …
Agat-7. Rev.0. Floppy-drives emulators.
At the moment, I’ve completed the schematics, and I’ve started to work on the PCB layout. There will be some changes caused by discovered mistakes or better layouts. So, please, treat it as a draft at this stage. Please, let …
Agat-7. Rev.0. Video output.
I’ve spent some time debugging STM32L based 140K “floppy drive” for my “Agat-7” replica project. It is already perfectly workable in read-only mode. I transferred it to the SPI interface to save some FPGA pins, and now I need only …
HD44780-compartible LCD display and STM32.
HD44780-compatible LCD digital-alphabetical displays are very convenient to use in hobby projects. They exist in different sizes and are quite cheap. The most popular are 2 line modules with 16 characters per line (16×2). Also, 8х2, 16х1, 20х2, 20х4 and …