IBM 6400i Setup Manual page 309

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The twinaxial portion of the IBM Coax/Twinax feature of this printer is
subject to the following limitations:
Minimum dot matrix of 9 wide by 8 high
Minimum dot matrix of 4 or 7 wide by 8 high
Print lines greater than 198 characters
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TN5250 vs. Twinax (Non-IPDS) on the IBM 6400:
There are few features that may have been available through Twinax
(Non-IPDS) that are not supported or are limited under TN5250.
Some of the unsupported features are superscript, subscript, and
word underscore. Some of the limitations are line density, character
selection, and page presentation. This is a partial listing, so it is
suggested that you review your jobs to determine which adjustments
should be made to accommodate these limitations.
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IBM 6400 vs. 4234 IPDS Comparisons - 4234 Emulation Differences
The 4234 emulation will not support Load Symbol Sets (LSS)
The 4234 emulation will use Courier for all Near Letter Quality (NLQ)
mode printing, whereas 4234-NLQ mode was Gothic for 13.3, 16.7,
and 18 CPI. The dot sizes are different.
Also, the 6400 has a single dot size vs. three with 4234. For bar code
applications, some combinations of unit module width, wide-to-narrow
ratio, and element height may affect read rates.
The 4234 emulation will support image and font resolution of 120 x
144 pel, compared to 144 x 144 pel in the 4234. This will cause
images to change size vertically.
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Proportional Space Mode (PSM) is not the same in your new printer.
Some differences will occur.
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IBM 6400 vs. 4234 IPDS Comparisons - Differences:
The 6400 will report Loaded Font command set (LF2) in the Sense
Type and Model (STM), but will not support Load Symbol Set (LSS).
The 6400 will support Page Continuation Actions (PCA) without
highlighting.
The 6400 cannot detect Human Readable Information (HRI) outside
of the Bar Code Presentation space under all circumstances.
NOTE: For information on differences between this printer's data stream
emulations and other printer data streams, such as the IBM
Proprinter III XL, please refer to the 6400 ASCII Programmer's
Reference Manual.
Limitations
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