Thanks to Duncan Brown at the AWA Museum and HAL/Barrett/Motorola, the contents of the DSRTTY-WIN CD-ROM v2.0.1 are now on line at
https://www.navy-radio.com/rtty/hal/DSRTTYWin_CD_V201/
In that directory is also a zip file with the contents if you'd rather download that than all the pieces.
I know nothing al all about this stuff - the manual is there so you can read it for yourself.

Other HAL documents are at
https://www.navy-radio.com/rtty/hal.htm

Cheers,
Nick England K4NYW
www.navy-radio.com