TRS-80 Model III/4/4P Emulator Page Last updated April 8, 2005

This program emulates a complete TRS-80 Model III/4/4P configuration including: Z80 Micro-Processor running at 2 & 4 MHZ 14k ROM memory (Model III/4) 4k Boot ROM (Model 4P) 16k, 32k , 48k, 64k & 128k memory options 2k video memory with 2 screen modes:   - 64 by 16 screen with double-wide mode   - 80 by 24 screen with double-wide mode Standard keyboard Parallel printer port (port & memory mapped) RS-232 Port Real time clock interrupt (30hz & 60hz) Cassette port sound Creation of real cassette tapes loadable on a TRS-80 100% compatible WD1793 floppy disk controller 4 double-sided double-density 80+ track drives 100% compatible RS WD1010 hard disk controller 4 hard drives w/up to 8 heads and 1024 cylinders each CCR-81 cassette recorders:  - Virtual recorder saves & loads from     virtual cassette files  - Wave recorder saves & loads from Wave sound files High resolution graphics boards:   - Radio Shack   - Micro-Labs Orchestra-90 stereo music VS-100 voice synthesizer In addition to the standard TRS-80 configuration the emulator also supports:  A point & shoot configuration screen with:   - Unlimited configurations selectable at start-up   - All system options and virtual disks saved on exit A point & shoot virtual floppy selection screen with:   - Ability to open and create new virtual disks   - New & powerful virtual disk format able to do     everything a real  floppy disk can do   - Able to read & write other emulators JV1 & JV3 disks   - Ability to boot, read, write & format REAL TRS-80     floppy disks in a compatible PC drive A point & shoot virtual hard disk selection screen with:   - Ability to open and create new virtual hard disks   - Virtual hard disk format compatible with existing virtual    disks and other emulators virtual disks. A virtual cassette recorder control screen with:   - Ability to open and create new virtual cassettes   - Controls just like a real cassette recorder   - 500 & 1500 baud rate selection   - Feature to force cassette motor on A Audio/Wave cassette recorder control screen with:  - Ability to open and create new audio Wave files  - Controls just like a real cassette recorder  - Ability to load real TRS-80 tapes using SB line input  - Ability to save cassette port output to Wave file  - Ability to load Wave file recordings of tape programs  - Feature to force cassette motor on 3 user selectable fonts (early, later & PC) 2 user selectable keyboard layouts (PC & TRS-80)  - Keyboard layouts are files which can be user modified    to create custom keyboard layouts Ability to save & load system snapshots Ability to load and/or execute /CMD files directly from a PC directory Ability to drop to a DOS prompt Emulator speeds are accurate to .01% of a real TRS-80's for true sound and game play, plus:   - Hot-key speed selection of 1, 2, 4, 8 MHZ & Turbo   - Turbo speed is limited only by your PC's speed   - An override speed can be set & locked so the TRS-80    runs at user selected speeds transparent to TRS-80 OS. Emulated LDOS & LS-DOS compatible hard drives for faster hard disk access.  - For use when hardware compatible hard drives aren't    needed and higher speed is desired.  - Up to 8 drives can be mounted at one time. Hardware clock (port mapped w/utilities) PC mouse support (port mapped) PC Joystick support (port mapped) PC to TRS-80 file I/O (port mapped w/utilities) Enhanced instruction set including instructions to:   - Open, close, read, write PC files   - Read, change & display the PC directory   - Advanced mouse support w/drivers   - Execute DOS commands  - 8, 16 & 32 bit multiply and divide functions  - Ability to read and write to PC I/O ports & memory Amplifier for cassette & Orchestra-90 sound:   - PC speaker   - SoundBlaster Pro/16/32 ISA System Requirements:  A Pentium 75mhz compatible system 640k memory w/512k free VGA card  MSDOS 6 or better or Windows 9x/2000/XP Note: Hardware emulation that requires access to PC hardware such as: Sound / Joystick / Floppy or Serial I/O are not supported in Windows 2000 or XP. Optional Requirements:  Pentium 166mhz, for 8mhz operation SoundBlaster Pro, SB16, SB32 or compatible ISA/PCI, DOS compatible card  DOS or Windows compatible Mouse  DOS compatible Joystick

TRS-80 Model 1/III/4 Computer Software

I have scanned and preserved a large quantity of TRS-80 software and documentation.

TRS-80 Software Pages

All files on this website (including the emulator distribution) are compressed using WinAce.

You will need WinAce v2.xx or above to extract the data from files downloaded from this website.

If you don't have WinAce use the link below to download the free file extractor XAce Plus.

TRS-80 Model 1/III/4 Emulator Documentation

The documentation should answer most questions about the emulator's functions.

The following link will take you to the TRS-80 Model 1/III.4 emulator on-line documentation:

 Documentation

Enhanced Z80 Instructions

The emulator has a set of enhanced Z80 instructions. These instructions allow TRS-80 programs to interface with the PC's disk drives, ports, memory and other hardware. These instructions also add high level math functions to the Z80 instruction set.

NOTE: These instructions are only available in the emulators.

The following links contain a list of the enhanced instructions and documentation for each instruction.

Enhanced Instruction Documentation (on-line)

Enhanced Instruction Documentation (Microsoft Word 119k)

TRS-80 Model 1/III/4 Emulator News

Old TRS-80 Emulator Update News