Juraj's Blog

I thought it would be fun to calculate length of each audiobook, as I really like audiobooks.

I wanted to calculate the amount of pages per ebook, for statistical purposes.

Adding a first-person mode to GTA III A couple of years ago the re3 (reverse-engineered GTA 3) project received some publicity as got …

I like doing small projects and one-off games for my kids, and I’ve recently acquired a handheld industrial PDA with a barcode scanner that …

I often chat with my son about computer games on the way to the school in the morning.

I like it when software is fun to use, and Deeds is fun!

I’ve fixed two more bugs in the RISC-V emulator recently, both related to memory paging .

I’ve already visited the wonderful MOS 6502 architecture in a post titled Fantasy console on a console where I ported my 6502 emulator to …

Trying to debug the Linux boot process on the emuriscv RISC-V emulator has led me to discover another fun bug, one that appears when you …

My visually-impaired friend asked me for help in developing a conversion tool for the Slovak text into the Braille code.

I thought it would be fun to run Windows 2000 on a Pinebook - a nice little ARM-powered laptop.

After developing the basic parts of a Sudoku game in text mode, I was looking for UI toolkit to make it playable with a mouse.

This is a companion article to the 4-in-1 game for taskbar post, which has four playable games for the Windows taskbar in 3727 bytes of …

Here’s a list of Linux system calls for the RISC-V architecture.

There was a fun little exercise in an old Fortran book that involved approximating a cube root using the Newton method to a specified …

After spending some time with emuriscv and attempting to boot Linux into a shell I realized that I’m doing something really wrong regarding …

Making a nicer disassembler I’ve had a rudimentary disassembler in the emuriscv emulator, but compared to other disassemblers out there it …

RISC-V features multiple privilege levels (machine, hypervisor, supervisor and user mode).

For reference, I wanted to check how qemu boots RISC-V Linux.

This week I’ve revisited my RISC-V emulator project emuriscv - https://github.com/jborza/emuriscv , as I’m still intrigued by the idea of …

Rolling your own on-screen keyboard I wanted to play the Robotics;Notes visual novel on my Windows touchscreen tablet, but unfortunately the …

I’ve been playing Sudoku on my phone for the past few weeks, learning new techniques and generally having fun.

As a fan of simulator games I’ve also tried a couple of steering wheel setups.

One of the most frustrating experiences with a computer is putting it to sleep, only to find it waking up as if it had been restarted.

See the source book Programming in Lua targeted at Lua 5.0.

In the first part I started to describe a simple Forth interpreter.

Sipeed Tang Nano FPGA development board I like FPGA development boards and I’m excited that there are products that exist outside of the …

Mobile development like it’s 2002 I thought it’d be fun to develop something for a mobile phone.

A collection of minigames under 4 KB As a kid, I had a cheap 8 in 1 Brick Game handheld console, which had LCD display with large dots, 4 …

Car accessories as game controllers?

In the last part I ended up with a partially working CPU with most of the single-clock instructions implemented.

Continuing with the implementation of CHIP-8 in Verilog, I wanted to continue with the CPU module and get it to actually execute some …

CHIP-8 arithmetic behavior and VF variable I’ve been fiddling with CHIP-8 and writing a sample program in Octo - a CHIP-8 IDE/assembler with …

I got into FPGAs with the intent of building a retro-computer.

VGA on an FPGA In the previous articles I’ve mainly interfaced with LCD displays.

CHIP-8 is one of the most popular target architectures for aspiring emulator writers.

There seems to be a better way to run ModelSim than I originally described in the LCD controller post , where I was a bit lost with the …

Doom on a screen, again Recently I’ve been playing with displaying DOOM on various devices (a smart watch and a smallish IoT stick), and …

A pocket calculator on FPGA One potato two potatoes Three potatoes, four!

Does it run DOOM?

What will we do with a drunken keyboard?

I wanted to play a bit more with the 128x64 LCD display and the FPGA board, while also exploring the memory-mapping concept of the retro …

Displaying things on a 128x64 display from an FPGA One of my FPGA boards came with a connector for a parallel-interface 12864 display, so I …

Over a month ago I bought an Altera Cyclone IV board from a local seller, it seems to be listed on Aliexpress as well.

I thought it would be cool to have a digital hourglass.

MCPU is a neat minimal 8-bit CPU (CPU design by Tim Boescke in 2001, cpldcpu@opencores.org ) - see its opencores project file and GitHub …

Why more LEDs?

Let’s do a calculator Let’s make a very simplistic 3-bit calculator that will: add or subtract number A and B number A is entered by DIP …

I’ve went through the first part of From Nand to Tetris course where I learnt to build a simple 16-bit computer called Hack from the digital …

As M5Stick only has three buttons, I wanted to prototype a control scheme based on accelerometer either by tilting or tapping the device …