Model 33 Type-Wheel Page Printer

Standard Models: 33-ASR, 33-KSR, and 33-RO
Military Models: ??
Relatives: ??
Manufactured: 19??-19??
Units Produced: ??
Units Remaining: ?? (estimated)
Dimensions (inches): ??
Weight (pounds): ??

Keyboard: 4-row with gray plastic keycaps
Code: 7/8-level ascii at 100?? wpm (110 baud)
Interface: 20-mA current loop (@48VDC typical?)
Full- or Half-Duplex
Motors: 115-VAC Synchronous
Options: TWX CCU...??

The Teletype Corp Model 33 was offered in Receive-Only (RO), Keyboard-Send-Receive (KSR), and Auto-Send-Receive (ASR) versions. The M33 is a ...

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This is my Western-Union-branded M33-ASR TWX machine. This one has a touch-tone dialer, but TWX machines also came with rotary dialers. Also having rotary dialers are the similar-looking Telex machines, which can be identified by four pushbuttons below the dialer, whereas the TWX units have six buttons. But I believe that Telex only used baudot machines (like the M32), not ascii units (like the M33).

More pics here.

This M33-ASR has a "private-wire" CCU, for 20- or 60-mil current loop use. The CCU panel on the right should be blank, but someone added a light to it. It's getting harder to find the removable copy stand, as well as the plastic (or metal) chad box, which is hanging under the punch on the left. M33-ASR-2.jpg

The small box at the top of the stand is the power supply for the tape reader -- in 3300-series machines, this is built into the CCU. In a private-wire unit, like this one, the stand is empty except for the reader supply. In a TWX unit, there is a large dataset (modem) that sits in here. M33-ASR-15c.jpg

This 33-ASR is pretty clean. Too bad it has chipped plastic at the front. M33-ASR-16a.jpg

The front unit is the standard tape reader with the three-position START/STOP/FREE lever. The less-common "auto" reader would have a fourth AUTO position -- it could be commanded on and off remotely. The tape punch is the unit directly behind the reader M33-ASR-16c.jpg

This unit has a Carterfone modem (a third-party modification) added to a standard private-wire CCU. M33-ASR-17a.jpg

This Carterfone machine belongs to Clarence Turk. M33-ASR-17c.jpg

The 3300-series machines usually had a one-piece plastic cover, so the tape units did not look like they were bolted-on afterthoughts. I don't know if there was a Model 3300 or not -- the only one I have heard of was labelled Model 3320. The later 33 manuals discuss 3300-series machines, but don't mention specific model numbers. M3300-ASR-1a.jpg

This later 3300-series machine has the auto-reader. The DC1 (XON) and DC3 (XOFF) control characters are used as start/stop commands for the auto tape reader. Since XON/XOFF chars are used today as software-handshaking flow-control characters, you want to disable software handshaking if you are connecting to a 33 with something like a terminal emulation program. Supposedly, DC2/DC4 have been used as auto tape punch on/off commands in the M33asr, but I have not seen any more info on an auto tape punch. Anyone? M3300-ASR-1b.jpg

This 3320 machine has the standard tape reader. Another CCU panel is ruined by hacking lights and switches on it. M3320-ASR-2a.jpg

This 3320 machine has the auto-reader, but not the one-piece case. M3320-ASR-3a.jpg

This is an earlier auto-reader. Too bad the plastic tape cover has broken off. M3320-ASR-3c.jpg

Some TWX machines had an optional auto-dialing card-reader gizmo -- these are blank card that were used with it. M33-dialer-cards.jpg