TELETYPE MODEL 28 PAGE PRINTER

The Teletype Corp Model 28 was offered in Receive-Only (RO), Keyboard-Send-Receive (KSR), and Automatic-Send-Receive (ASR) versions. The M28 is a rugged machine, capable of continuous operation, and has been described as "the cadillac of teleprinters." It resulted from many years of R&D, and was state-of-the art in the 50s.

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Model 28-KSR Type-Box Page-printer
M28-KSR-1-300w.jpg

Standard Model: 28-KSR
Military Model: ??
Relatives: The M35 is an ascii derivative.
Manufactured: 1951-1960?
Units Produced: ??
Units Remaining: ?? (estimated)
Dimensions (inches): ??
Weight (pounds): ??

Keyboard: 3-row with gray plastic keycaps (plus red local keys)
Code: 5-level baudot (ustty or ita2) at 60 wpm (45.5 baud)
Interface: 60-mA current loop (@120VDC typical)
Full- or Half-Duplex; 60/20-mA selectable
Motors: 110-VAC Synchronous, or ??
Options: 60/75/100-wpm gearbox; others??

The Teletype Corp Model 28-KSR ...

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This is my M28-KSR, which is a table-top version.

More pics here.
M28-KSR-Gil-Front-Left-400w.jpg


Model 28-RO Type-Box Page-printer
M28-RO-1-300w.jpg

Standard Model: 28-RO
Military Model:
Relatives: The M35 is an ascii derivative.
Manufactured: 1951-1960?
Units Produced: ??
Units Remaining: ?? (estimated)
Dimensions (inches): ??
Weight (pounds): ??

Keyboard: None
Code: 5-level baudot (ustty or ita2) at 60 wpm (45.5 baud)
Interface: 60-mA current loop (@120VDC typical)
Full- or Half-Duplex; 60/20-mA selectable
Motors: 110-VAC Synchronous, or ??
Options: 60/75/100-wpm gearbox; others??

The Teletype Corp Model 28-RO...

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This M28-RO is brand new and still in the packing crate, as seen the the picture above. Here's a peek inside this beautiful machine. M28-RO-1b-500w.jpg

This is my M28-RO, which looks downright skanky after seeing the one above. It has a three-speed gearbox, controlled by a 60/75/100-wpm shifter.

More pics here.
M28-RO-Gil-Front-Left-400w.jpg


Model 28-ASR Type-Box Page-printer
M28-ASR-1-300w.jpg

Standard Model: 28-ASR
Military Model: AN-UGC-6K
Relatives: The M35 is an ascii derivative.
Manufactured: 1951-1960?
Units Produced: ??
Units Remaining: ?? (estimated)
Dimensions (inches): ??
Weight (pounds): ??

Keyboard: 3-row with gray plastic keycaps (plus red local keys)
Code: 5-level baudot (ustty or ita2) at 60 wpm (45.5 baud)
Interface: 60-mA current loop (@120VDC typical)
Full- or Half-Duplex; 60/20-mA selectable
Motors: 110-VAC Synchronous, or ??
Options: 60/75/100-wpm gearbox; others??

The Teletype Corp Model 28-ASR...

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This is a nice-looking M28-ASR. The printer is on the right side, the Typing-reperf unit is in the center (tape punch), and the Transmitter-Distributor (tape reader) is on the left. M28-ASR-3.jpg

This M28-ASR is a military version, AN-UGC-6K. M28-ASR-2a.jpg

Here's a peek under the hood of the AN-UGC-6K. M28-ASR-2b.jpg

There is a second typing-reperf unit inside on the left. M28-ASR-2c.jpg

This is the Electrical-Service-Unit (LESU) for the AN-UGC-6K. M28-ASR-2d.jpg

This machine is branded for the Bell System. M28-ASR-8b.jpg

The instruction plates beside the keyboard say ??. M28-ASR-8c.jpg

This unit does not have a second typing-reperf in the left side. M28-ASR-8d.jpg


Model 28-KSR-Skintight Type-Box Page-printer
M28-KSR-Skintight-1-300w.jpg

Standard Model: None?
Military Model: TT-176B-UG
Relatives: M28-KSR
Manufactured: 1951-1960?
Units Produced: ??
Units Remaining: ?? (estimated)
Dimensions (inches): ??
Weight (pounds): ??

Keyboard: M28 keyboard
Code: 5-level baudot (ustty or ita2) at 60 wpm (45.5 baud)
Interface: ??
Motors: 110-VAC Synchronous, or ??
Options: gears?

The Teletype Corp Model KSR-Skintight is a version of the KSR which is even smaller than the KSR-table-top version. I think the Electrical-Service-Unit (LESU) is external.

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Model 28-KSR/RO-Compact Type-Box Page-printer
M28-KSR-Compact-1-300w.jpg

Standard Model: None?
Military Models: UGC-20 (KSR-Compact), AN-UGC-25A (RO-Compact)
Relatives: M28 typing unit, and M32 keyboard.
Manufactured: 1951-1960?
Units Produced: ??
Units Remaining: ?? (estimated)
Dimensions (inches): ??
Weight (pounds): ??

Keyboard: M32 keyboard on KSR; none on RO.
Code: 5-level baudot (ustty or ita2) at 60 wpm (45.5 baud)
Interface: ??
Motors: 110-VAC Synchronous, or ??
Options: gears?

The Teletype Corp Model 28-Compact, the smallest 28 printer, was available in KSR and RO models. The KSR version used a keyboard from a Model 32, which most folks disliked compared to the original M28 keyboard....

I think the Electrical-Service-Unit (LESU) is external.

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This is an M28-KSR-Compact, military designation UGC-20. This clean unit belongs to Doug Alderdice. M28-KSR-Compact-2.jpg

Bill Buzbee's M28-KSR-Compact is open, showing the optical distributor. This is a "Tempest" low-emi design, to minimize eavesdropping potential. M28-KSR-Compact-3a.jpg

And here's the other side. M28-KSR-Compact-3b.jpg

There was also an RO version of the Compact, as this dusty one demonstrates. This is military model AN-UGC-25A. M28-RO-Compact-1.jpg