TR-DOS

TR-DOS is a disk operating system for the ZX Spectrum with Beta Disc and Beta 128 disc interfaces. TR-DOS and Beta disc were developed by Technology Research Ltd (UK), in 1984.^[1][2] A clone of this interface is also used in the Russian Pentagon and Scorpion machines.

TR-DOS

Developer	Technology Research Ltd
Initial release	1984; 41 years ago (1984)
Latest release	5.03 / 1986; 39 years ago (1986)
Available in	English
Platforms	ZX Spectrum
License	proprietary

It became a standard in Russia and most disk releases for the ZX Spectrum, especially of modern programs, are made for TR-DOS as opposed to other disk systems.^[3][4]

The latest official firmware version is 5.03 (1986).^[5] Unofficial versions with various enhancements and bug-fixes have been released since 1990, with the latest being 6.10E (2006).^[6]

TR-DOS handles SS/DS, SD/DD floppy disks. All modern versions support RAM Disk and some versions support hard disks.

Current emulators support TR-DOS disk images in the formats .TRD or .SCL.

Commands

The following list of commands is supported by TR-DOS V4.^[7]

• 40
• CAT
• CLOSE
• COPY
• ERASE
• FORMAT
• GO TO
• INPUT
• LOAD
• MOVE
• NEW
• OPEN
• PRINT
• RETURN
• RUN
• SAVE

Utility programs include:

• FILER
• TAPECOPY (replaces BACKUP, COPY and SCOPY utility programs in TR-DOS V3)

See also

• iS-DOS
• CP/M
• DISCiPLE