Printers


7245A

Thermal Selection:

Name: 7245A
Product Number: 7245A
Introduced: 1978
Division: San Diego
Ad: Click to see, Click to see
Original Price: $4600
Catalog Reference: 1979, page 254
Donated by: Australian Computer Museum Society

Description:

The 7245A was a long-axis thermal graphics printer. It was both a standard raster printer and an HP-GL vector plotter (the paper moved in both directions when in plotter mode). This sprocket-feed printer could plot images up to 200 feet long (7.4 inches wide). It had a raster graphics print resolution of 106 dots per inch and a vector graphics step size of 0.016mm, better than HP pen plotters of the time. The 7245A printed raster characters in a 9 x 12 dot cell at a speed of 38 characters per second. The 7245A was an HP-GL language machine and came standard with an HP-IB interface. The RS-232 version carried part number 7240A (January, 1980). Click here to view an 11 second video of the 7245A in action (1.9 MB).


Collector's note:

The 7245A was a very interesting and unique product. It was the only hardcopy vector product made by HP that used thermal technology. The 7245A was basically a standard printer that could also print graphics at the same quality as HP pen plotters (see print sample). Thermal technology gave the 7245A two advantages over pen plotters - it was quiet, and the user never had to worry about a pen running out of ink. The never-running-out-of-ink benefit was significant because it allowed users to run plots unattended or overnight. The 7245A also had long-axis capability which allowed it to print graphs up to 200 feet long.

7245As are very rare; it is surprising that more weren't built. One of the biggest challenges in running these machines today is availability of media. The museum is not aware of any current sources of sprocket-fed thermal paper. With considerable effort, this media could probably be made up from a standard roll of thermal paper taped on each side to the peeled edges from standard, sprocket-fed, fanfold paper. The spacing between sprocket holes on 7245A media is exactly half of the spacing between holes on standard fanfold paper, so some hole-punching will be required. The museum has a few boxes of original HP media in house. All 7245A shipped with a replacement printhead inside the printer. The two samples at the museum still have their original and replacement printheads intact.

 

| Back | More Images | Product Documentation | Category Accessories |

^ TOP

©2004 - 2016 WordSong Communications Pty. Ltd. All Rights Reserved.

The HP Computer Museum and Wordsong Communications Pty. Ltd. are not affiliated with the Hewlett Packard Company or with Hewlett Packard Australia Ltd. Hewlett Packard and the HP logo are trademarks of the Hewlett Packard company. This website is intended solely for research and education purposes.

View our Privacy Statement Terms of Use