![]() Invokes the snapshot menu (described later).Įxits the emulator. Invokes the delay menu (described later). If you press any of these hot keys by accident (except for SHIFT F8), press ESC to return to the emulation. Only a few “hot keys” are needed to control the emulator. To exit the emulator, press SHIFT F7 and answer the question with a “Y” (for “Yes”). The first time you use the emulator, you will not have any virtual disk files “mounted” in the virtual drives, so it will prompt you to press F8 and do so. Subsequently, the emulator will read your machine speed and other options you have selected from that configuration file.Īfter the emulator displays its startup screen, it will wait for you to press a key. On its first run, the emulator will calculate your machine speed and create a configuration file (M4.CFG) in the current directory. To start the Model 4 emulator, just type M4 at the MS-DOS prompt. You will then need a means to transfer the file to your PC, such as TRSREAD (supplied with the registered version of the emulator) or a null modem transfer. Of course, there must be enough room on an available drive to hold this file. Go into BASIC, then type and run the following program:Ģ0 FOR X=0 TO &H37FF: PRINT#1,CHR$(PEEK(X)) : NEXT X If you have a real Model 4, start it up in Model 3 mode using an operating system such as LDOS. Copy it into your Model 4 emulator directory and rename it MODEL4.ROM. If you have a virtual disk image of LS-DOS 6.3.1, use the TRSREAD program (supplied with the registered version of the emulator) to extract the file MODELA/III. If you have the registered version of the emulator and plan to use Model 3 mode, you should also create a MODEL4.ROM file and place it in this directory. This directory should also hold any virtual disk files you want to use. To install the Model 4 emulator, create a directory for it on your hard drive and unzip the file M4V10.ZIP (unregistered shareware version) or M410REG.ZIP (registered version) into it. ![]() The emulator also supports a double-wide display in both 80 by 24 and 64 by 16 modes. The character sets used in this emulator include all of the characters in the Model 4 (and Model 3) character sets, including the international characters (with the exception of the katakana characters). It has been able to run all of the operating systems and applications software I have tried, including versions of LS-DOS, MULTIDOS for the Model 4, DOSPLUS for the Model 4, Montezuma Micro CP/M, LeScript, Allwrite, Scripsit Pro, PRO-MRAS, PRO-EnhComp, and many more. Obviously, no emulation can ever achieve complete software and hardware compatibility, but this emulator comes very close. RS-232 communications port (registered version only) Parallel printer port (only with PC parallel printer)Īmplifier for sound output (through PC speaker or Sound Blaster card) ![]() High resolution graphics board (Micro-Labs or Radio Shack, registered version only) Real time clock interrupt (30 ms in Model 3 mode, 60 ms in Model 4 mode)Ħ4 by 16 screen with double-wide mode in Model 3 mode (registered version only) Hard disk drive, with capacity of up to 13 megabytes (registered version only) Z-80 microprocessor (including all undocumented instructions) with 64K (unregistered shareware version) or 128K (registered version) of RAMĤ double-sided double-density 80 track drives M4.EXE emulates a Model 4 with the following hardware: If you want a TRS-80 emulator that will run under Microsoft Windows, try TRS32. Note: This emulator will NOT run under Microsoft Windows. If you want to read physical TRS-80 disks using the emulator, your computer will need an appropriately-sized disk drive (usually 5¼″) and a capable floppy disk controller. A parallel printer and Sound Blaster-compatible sound card are optional. The registered version adds support for Model 3 mode, the 128K memory upgrade, a high resolution graphics board, a virtual hard drive, a hardware clock, and RS-232 communications.Įither version of the Model 4 emulator will run on an IBM-compatible computer with an 80386 or better processor, 640K of memory, MS-DOS 3.0 or higher, VGA graphics, and a hard drive. The unregistered shareware version of the program emulates a 64K Model 4 with four floppy disk drives. It is an extremely fast emulation, written and optimized from the ground up in 80386 assembly language. This program emulates a popular early microcomputer, the TRS-80 Model 4. Documentation - TRS-80 Model 4 Emulator for MS-DOS Introduction ![]()
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