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Z80Disasm – A TRS-80 Disassembler for Microsoft Windows

Z80Disasm is a freeware command-line Z80 disassembler for Windows. It is a symbolic labeling disassembler that supports all Z80 instructions and can read either TRS-80 CMD files or Intel HEX files.

Usage

The Z80Disasm command line looks like this:

The following options are supported:

For example, to disassemble the program SCRIPSIT.CMD to the screen, the command line would look like this:

To disassemble the program ROBOT.CMD to the file ROBOT.ASM, using the screening file ROBOT.SCR, the command line would look like this:

To disassemble the program VC/CMD which is contained on VISICALC.DSK, the command line would look like this:

Screening Files

Z80Disasm supports the use of screening files to separate data from code. By using a well designed screening file, data areas can be properly marked using DB and DW pseudo-ops instead of meaningless instructions.

A screening file follows a well-defined format, consisting of address ranges separated by commas. (Long time TRS-80 users may remember this format as similar to that used by DSMBLR, the MISOSYS disassembler for the TRS-80.)

Four different types of address ranges are supported:

Two types of prefixes are supported for ranges:

For example, here is a valid (albeit meaningless) sample screening file:

That screening file indicates the following areas of data:

• One byte of data at 0x3000
• Byte data between 0x3A1B and 0x3A1D
• Word data between 0x3010 and 0x3014
• Word data between 0xE000 and 0xFFFE
• Byte data between 0x0000 and 0x1000