I am interested in old computer terminals, including the one described below.
If you have one, please do not throw it out - I would be happy to give it a good home!
Send me an email.

  The ITT Model 3501A ASCIScope is a self-contained terminal with a full keyboard, monochrome CRT, and a top-mounted acoustic coupler, first available in October of 1972. By April of 1974 more than 700 had been sold.

The 3501 model supports 960 characters (12 lines × 80 characters) on an 8×5 inch screen using 64 ASCII characters with a 5×7 font matrix.

It is capable of both half and full duplex operation at 2400 bits per second.


From Computerworld magazine, July 12, 1972:

ITT Offers $65/mo CRT With Acoustic Coupler

EAST RUTHERFORD, N.J. - A CRT display terminal that competes in price with teletypewriters has been introduced by the Data Equipment and Systems Division of ITT.

Called the Model 3501 Asciscope, the unit includes a display, keyboard, buffer, modem, acoustic coupler and maintenance for $65/mo, ITT said. When connected via the acoustic coupler, the unit can transmit at 110 bit/sec in 11-bit format or 300 bit/sec in 10-bit format. The Asciscope can also be hardwired via a data access arrangement and interfaces are available to use external modems at speeds of 1,200 or 2,400 bit/sec, ITT said.

The CRT is described as compatible with communications software that can interact with Model 33 and 35 TTYs. The 12-in. screen can display 960 characters and the device can operate in roll, page and block (buffered) modes which are switch-selectable by the operator. The block mode allows transmission of selected portions of the display bracketed by control symbols.

Printer Interface

A printer interface is available to connect a Model 33 receive-only TTY. The CRT performs input parity checks and displays detected errors as solid squares on the CRT. The Asciscope can communicate with other terminals or teletypewriters and the unit includes an MOS memory that can store the contents of one complete display format.

Maintenance for the Asciscope will be provided by ITT service centers which will replace the unit rather than perform on-site repair, ITT said. The CRT costs $2,195 and first deliveries will begin in September. ITT is at E. Union Ave., East Rutherford, N.J.

From COMPUTER magazine, October 1973:

ITT Markets New General-Purpose, Low-Cost Display

The Asciscope, a new low-cost CRT display, has been announced by ITT Data Equipment and Systems Division.

The Asciscope Display is a complete terminal, including acoustic coupler, built-in 110/300 bps modem, and buffer memory, all available for $65 a month ($15 a week) per unit, including maintenance. The Asciscope Display can be utilized for terminal-to-computer or terminal-to-terminal transmission and is compatible with existing TTY software routines.

The Asciscope Display features a 12-inch viewing screen capable of displaying up to 960 characters, block or character-by-character transmission modes, and is capable of either full or half duplex operation. Standard features included are an interface for printers operating at 10, 20 or 120 cps and an RS 232C interface for external modems operating at speeds up to 2400 cps.

Copies of a free, four-page brochure describing the new display may be obtained from ITT Data Equipment and Systems Division, East Union Avenue, East Rutherford, New Jersey, 07073.

ASCISCOPE advertisement
Advertisement from Computerworld, June 28, 1972

Teletype-Compatible Terminal

The Model 3501 Asciscope terminal offers the user editing facilities and communicates at either 110 bits/sec (Teletype-compatible) or 300 bits/sec. The terminal has a memory capable of storing the entire screen display (12 lines of 80 characters each). A 5 x 7 dot matrix forms characters. Editing can be done on a line-by-line basis before transmission. Interfaces are included to printers and to external 1,200- and 2,400-baud modems. Purchase price is $2,195; maintenance cost is $20 per month.

ITT Data Equipment and Systems Div.
East Union Ave.
East Rutherford, N.J. 07073

From Behavior Research Methods and Instrumentation, 1972, Vol. 4 (6)

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