Talk:Tallgrass Technologies

External links modified

Hello fellow Wikipedians,

I have just modified one external link on Tallgrass Technologies. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

• Added {{dead link}} tag to http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F4245264
• Added archive https://web.archive.org/web/20111103152526/http://www.house.gov/jec/cost-gov/regs/eti/grab.htm to http://www.house.gov/jec/cost-gov/regs/eti/grab.htm

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 18 January 2022).

• If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
• If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 08:22, 26 May 2017 (UTC)

Patented all-digial data separator was not used for hard disk

The patented all-digital PLL data separator described in the article was not used for hard disk drives, even though it was invented by the founder of Tallgrass. The all-digital PLL was not suitable for the 5 Mbps pulse rate from an ST-506 hard disk, so a conventional analog PLL based data separator was used.

Per the patent, the data separator needs to be clocked at 32x the pulse rate, and the patent gives an example of 16 MHz for a standard-density 5 1/4-inch floppy (250 kbps pulse rate). For an ST-506 hard drive, this would have required the data separator to run at 160 MHz, which was well beyond the technology at the time. The fastest bipolar PROMs available at that time which could have been employed in such a data separator had an access time (and cycle time) of around 35ns, which gives an upper bound of 28.5 MHz for a PROM-based data separator.

I saw the Tallgrass controller board may times in the early 1980s, but there do not appear to be any photographs of it on the internet, and only a few photographs of the PC host interface board. --Brouhaha (talk) 16:46, 10 November 2021 (UTC)

Claim of being "first" hard disk for IBM PC is questionable

Tallgrass was fairly early, but the claim that the Tallgrass hard disk system for the PC was the first such drive is almost certainly wrong. By the first quarter of 1982, there were many hard disk systems available from many vendors, including Datamac, Davong, Santa Clara Systems, Inc., Tecmar, and VR Data. By the second quarter, more companies offered them, including ASAP Computer Products, Control Systems, Corvus, (PC)2, Professional Micro Systems, and QCS. --Brouhaha (talk) 18:05, 10 November 2021 (UTC)

Tallgrass released their hard disk products in late (probably November) 1981. It was a close race, but Tallgrass, it seems, was the first. I found some more citations to back that claim up. DigitalIceAge (talk) 21:47, 21 March 2023 (UTC)