I have this curiosity for 25 years and I would love to understand the trick. In the Commodore 64 the border was not addressable by the 6569 VIC. All you could do was to draw pixels in the central...

I'm looking to develop a new Forth system, aimed at making game development easier on one or possibly several retro console platforms. I'm something of a Forth beginner, and need your help deciding...

Since the Gameboy's processor, the LR35902, is a hybrid of the Z80 and the Intel 8080, keeping in mind that the Z80 and the Intel 8080 were designed to be mostly cross-compatible anyways, could any...

I'm doing a bit of retro programming for fun. What I want to create is a DOS game using EGA graphics but I am having a bit of trouble finding a good reference on the web. Everybody who talks about ...

I just watched the Super Mario Bros. -1 World glitch in youtube and I really began wondering about the code behind those games. Which language was used? What about the OS for the video games ...

Sometimes when coding in ZX Spectrum Basic I need to evaluate logical expressions that are formed by two operands and a logical xor like this: IF (left operand) xor (right operand) THEN Since ZX...

A long time ago in a galaxy far away, there were microcomputers which ran BASIC and had simple Sound commands which made the machine beep and hiss in all sorts of weird and wonderful ways. As well...

When I run compile this code with SDCC 3.1.0, and run it on an Amstrad CPC 464 (under emulation, with WinCPC 0.9.26 running on Wine): void _test_malloc() { long idx = 0; while (1) { if (malloc...

I recently got bored and fired up my old Mac OS Classic emulator, and then got nostalgic for writing old-school applications for the system. So, my question: Where can I get dev tools that ...

EDIT, GOOD NEWS! 10 years later, I decided I finally had to sit down and make this happen. I wrote the necessary convert-8080-to-z80-or-x86 and convert-z80-to-x86 tools, converted the Sargon...

Following up on the "How do I code and compile an Amiga application?" question, which development library is required to boot an Amiga application from a floppy disk? Update: (2012-04-10) To consi...