The Modern Z80 Toolchain
Since you are writing Z80 code on a modern computer (like a Linux LXC), you need a cross-assembler to translate your mnemonics into machine code and an emulator to run and debug that machine code.
Choosing a Cross-Assembler
A cross-assembler runs on one type of machine (x86 Linux) but produces code for another (Z80).
Popular Assemblers:
| Assembler | Focus | Key Features |
|---|---|---|
| Z80Asm | Generic Z80/Z180 | Simple, fast, and highly compatible with many old Z80 dialects. |
| sjasmplus | ZX Spectrum / MSX | Powerful modern assembler with rich macro support, binary includes, and comprehensive error checking. |
| WLA DX | Multi-platform | Supports Z80, GameBoy, and other 8-bit CPUs, good for cross-platform projects. |
Assembler Directives Revisited: Be aware that directives like `DEFS′ (define space) or macro syntax (Part 20) can vary widely between assemblers. Always check the manual for your chosen tool.
Integrating with Emulators
An emulator simulates the entire target Z80 machine (CPU, memory, screen, I/O) on your modern PC, allowing you to run and debug your code without real hardware.
Essential Emulator Features:
- Debugger: Must include a debugger that can display register contents, memory maps, and the CPU stack (Part 47).
- Breakpoints/Watchpoints: Allows you to stop execution when a memory location or instruction address is hit.
- Profiling: (Advanced) Shows which parts of your code consume the most T-states (Part 18), guiding optimization.
The Development Workflow:
- Write Code: Edit your `.asm′ source file.
- Assemble: Run the cross-assembler to generate the
.bin′ or.tap′ file. - Run/Debug: Load the output file into the emulator and test the execution flow.
The Linux Command Line Workflow
Your current Linux environment is perfect for the Z80 toolchain.
The Simple Compile Command:
# Example using sjasmplus to compile 'myprogram.asm'
sjasmplus myprogram.asm
# This generates 'myprogram.bin' (or similar)
This workflow allows you to write, compile, and generate Z80 code quickly and efficiently, integrating perfectly with your Hugo website for publishing.