Krown Porta-printer
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| Layouts | Proprietary |
|---|---|
| Keyswitches |
Datanetics DC-50 series Futaba MD series |
| Switch mount | PCB mount |
| Keycaps | Double-shot spherical |
Krown Porta-printer is a series of portable teleprinters intended for use by the deaf and hard of hearing. The Porta-printer and Porta-printer II each comprised a 40% keyboard together with a miniature printer and an acoustic coupler.
Keyboard[edit | edit source]
The original Porta-printer and Porta-printer II keyboards used Datanetics DC-50 series switches; this was followed by a keyboard using Futaba MD series switches. Both keyboards were designed by Meryl Miller.<ref name="conv-MM" />
Datanetics switch versions[edit | edit source]
Porta-printer[edit | edit source]
The 1975 original keyboard had dark grey keycaps.
Porta-printer II[edit | edit source]
The 1977 Porta-printer II keyboard switched to ivory keycaps. The PCB below bears the legend "KROWN RESEARCH BAUDOT KEYBOARD", along with "REV E" and "BAU-EKB-1-774".
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_--_top.jpg/249px-Krown_Porta-printer_II_(Datanetics)_--_top.html)
Top -
_--_top_with_switches.jpg/249px-Krown_Porta-printer_II_(Datanetics)_--_top_with_switches.html)
Top, showing switches -
_--_LHS_with_switches.jpg/249px-Krown_Porta-printer_II_(Datanetics)_--_LHS_with_switches.html)
Left-hand side, with switch close-up -
_--_RHS.jpg/249px-Krown_Porta-printer_II_(Datanetics)_--_RHS.html)
Right-hand side, marked "REV E" and "BAU-EKB-1-774" -
_--_IC_dates.jpg/249px-Krown_Porta-printer_II_(Datanetics)_--_IC_dates.html)
IC dates (7709 and 7651)
Futaba switch version[edit | edit source]
The Datanetics Porta-printer II keyboard was followed by a version with ivory/black Futaba MD series switches. The same keycap manufacturer appears to have been used, as the keycaps are identical in design to those in the previous two keyboards.
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_--_switches%2c_side.jpg/249px-Krown_Porta-printer_II_(Futaba)_--_switches%2c_side.html)
Side view of switches -
_--_switches%2c_top.jpg/249px-Krown_Porta-printer_II_(Futaba)_--_switches%2c_top.html)
Top view of switches
External links[edit | edit source]
- Southwest Museum Of Engineering, Communications and Computation — Krown Research / Krown Manafacturing
References[edit | edit source]
<references> <ref name="conv-MM">Correspondence with Meryl Miller, 2016-12-01–02</ref> </references>
