TELETYPE MODEL 28 PAGE PRINTER

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*
	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 ... (need more poop here)....

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


*Model 28-RO Type-Box Page-printer*
	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... (need more poop here)....

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.

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.


*Model 28-ASR Type-Box Page-printer*
	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... (need more poop here)....

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.

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

Here's a peek under the hood of the AN-UGC-6K.

There is a second typing-reperf unit inside on the left.

This is the Electrical-Service-Unit (LESU) for the AN-UGC-6K.

This machine is branded for the Bell System.

The instruction plates beside the keyboard say ??.

This unit does not have a second typing-reperf in the left side.


*Model 28-KSR-Skintight Type-Box Page-printer*
	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. (need more poop here)....

*Model 28-KSR/RO-Compact Type-Box Page-printer*
	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. (need more poop here)....

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

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

And here's the other side.

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