SN922 Hazeltine 2000

  • SpinRite v6.1 Release #3
    The 3rd release of SpinRite v6.1 is published and may be obtained by all SpinRite v6.0 owners at the SpinRite v6.1 Pre-Release page. (SpinRite will shortly be officially updated to v6.1 so this page will be renamed.) The primary new feature, and the reason for this release, was the discovery of memory problems in some systems that were affecting SpinRite's operation. So SpinRite now incorporates a built-in test of the system's memory. For the full story, please see this page in the "Pre-Release Announcements & Feedback" forum.
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    Dear Guest Visitor → Once you register and log-in please checkout the “Tips & Tricks” page for some very handy tips!

  • BootAble – FreeDOS boot testing freeware

    To obtain direct, low-level access to a system's mass storage drives, SpinRite runs under a GRC-customized version of FreeDOS which has been modified to add compatibility with all file systems. In order to run SpinRite it must first be possible to boot FreeDOS.

    GRC's “BootAble” freeware allows anyone to easily create BIOS-bootable media in order to workout and confirm the details of getting a machine to boot FreeDOS through a BIOS. Once the means of doing that has been determined, the media created by SpinRite can be booted and run in the same way.

    The participants here, who have taken the time to share their knowledge and experience, their successes and some frustrations with booting their computers into FreeDOS, have created a valuable knowledgebase which will benefit everyone who follows.

    You may click on the image to the right to obtain your own copy of BootAble. Then use the knowledge and experience documented here to boot your computer(s) into FreeDOS. And please do not hesitate to ask questions – nowhere else can better answers be found.

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Dave New

Well-known member
Nov 23, 2020
Wow. What a blast from the past. While I was in high school, I used Hazeltine 2000 terminals at the local college campus to log in to the GE-255 time-sharing system. They were so much faster than the ASR-33 TTY we used to dial in from the high school. This was in 1972.

The GE-255 system was impressive for the day. It had a terminal unit with 21 dial-in lines that occupied an entire wall in the computing center. There was a 3-ft. diameter hard-drive spindle with about a dozen platters, that ran a file system with maximum 6144 character files, so that was the maximum program size you could write in Dartmouth time-sharing BASIC, time-sharing FORTRAN, or time-sharing ALGOL. Using the CHAIN command, you could chain multiple program files together (sort of), and cheat the file size limitations.

I still have punched paper tape of my programs that I saved using the paper tape punch on the ASR-33 TTY.