M4 — A TRS-80 Model 4 Emulator For MS-DOS

Unregistered Shareware Version:

• 64K of RAM
• Four double-sided, 80-track floppy drives
• Parallel printer port
• Sound (can be routed through either the PC speaker or a Sound Blaster compatible sound card)
• Several international keyboard layouts

Read the M4 emulator documentation

Download the shareware version

Register online with a credit card or PayPal

Registered Version — $49.00:

• All features included in the shareware version
• Model III mode
• 128K memory upgrade
• Virtual hard drive (up to 13 megabytes)
• Hardware clock
• Serial port for RS-232 communications
• High resolution graphics (Radio Shack and Micro-Labs)
• Snapshots
• Model 4 mouse driver
• File transfer utilities