One of the main reasons (other than sales people pushing new radios) perfectly good HT1000 DN's are being surplussed is the inability to program (and subsequently tune/align) them using modern computing hardware.
Motorola stopped supporting the HT1000 about 4 years ago, the last RSS version was written in 2001. The radio (as well as others in the Jedi family) first debuted when Bill Clinton first took office 20 years ago and the fastest computer was a 486-DX2 at 66MHz running MS-DOS 6.22.
Trying to use incompatible programming hardware (USB) and operating system software (XP,Win7, etc) can not only be pointless, but can even damage the radio by putting a corrupted codeplug into it. There are few and fewer shops that will even ATTEMPT to service these radios, and the Motorola factory depot will not even repair them under time and materials, let alone flat rate, as they did in the past.
If you plan to use these (and other) Motorola radios of the past (e.g. MTS2000, MT2000, Maxtracs, GM300's, etc) it is *STRONGLY* advised that you get the CORRECT programming hardware and software. A genuine MOTOROLA Radio Interface Box, RLN4008E, is the most compatible. There are some decent aftermarket clones, the Sandy Ganz RIB is one of the most electrically compatible if you can find one. RIB to radio cables can be home made using schematics readily available. AVOID using "RIBLESS" cables from China with these OLDER radios. Yes, they MAY work- most of the time they don't, and if they do, they may not be reliable.
Finding a good older PC that works is becoming harder as years go on. Good thing about the HT1000 RSS is that it can run off a bootable floppy disk, the later (and last) versions were "Pentium compatible" and had timing routines adjusted for faster UART and CPU's of later (at the time) PC's, but they STILL REQUIRE AN MS-DOS ENVIORNMENT TO RUN PROPERLY. Much of this has to do with Interrupt requests that the RSS relies on to gain control of the serial port during read/write operations. ANY INTERFERENCE WITH THE READ/WRITE PROCESS CAN RESULT IN CODEPLUG CORRUPTION and an INOPERABLE RADIO. This includes attempting to read/write radios in DOS emulators under Windows operating systems such as XP, Windows 7, etc.
I would advise finding an old laptop with a WORKING FLOPPY DRIVE, as the hard drive will eventually fail and finding a replacement will be difficult. Make it bootable with MS-DOS 6.22 using any variety of utilites on the Internet. Copy your HT1000 RSS onto the diskette and run it from there. Always SAVE codeplugs BEFORE you WRITE BACK to the radio you are programming in case something gets hosed. Use a good quality RIB and RIB to radio cable. Make sure to disable any POWER SAVING in the BIOS of the machine.