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tion is not placed in core storage correctly and parity
errors may occur when the input information is read
in. This is because of the 2-character transfer opera-
tion of core storage. The odd-numbered location must
contain the right-hand (numeric) digit of the 2-digit
alphameric code. Transmission continues until termi-
nated by one of the following conditions:
1. Sensing of the end-of-line character when
paper tape is being read. At this time an
alphameric record mark character (a numeric
zero digit followed by a single record mark
character) is generated automatically by the
machine and placed in core storage following
the last character read from tape.
2. Pressing of the Release key on the console
when the typewriter is used to enter informa-
tion. An alphameric record mark character
is not generated automatically by the machine.
If it is desired to place an alphameric record
mark in core storage following the last char-
acter entered, the Record Mark key on the
typewriter must be pressed before the Release
key on the console is pressed.
3.
Reading the 80th character from card input
buffer storage into the 159th and 160th posi-
tions of core storage. A record mark is not
generated in storage.
Information from an input unit may be a random
mixture of numeric,alphabetic, and special characters.
Each character from an input unit is stored in core
storage as two digits. Flag bits are not transmitted on
characters read by an input unit; however, flag bits
already in the core storage area where the information
is read in remain unchanged. A single record mark
character read by an input unit is stored in core stor-
age as a numeric zero digit (C bit) followed by a
single record mark character (coded C-8-2).
Numeric data stored in the two-digit alphameric
mode must be converted by programming to single-
digit numeric data before being used in arithmetic
commands. The Transfer Numerical Strip instruction
(special feature) may be used for this conversion.
When the typewriter is selected, the 1620 stops
in automatic mode to await the manual entry of infor-
mation from the typewriter keyboard.
Execution Time. Same as Read Numerically.
Write Numerically (WN-38)
Description. Numeric information in the P address
and in successively higher-numbered core storage
locations is transmitted serially to an output unit.
Transmission continues until terminated by one of
the follOWing conditions:
1. Sensing of a record mark character in core
storage. The record mark character is not
written on the typewriter, but causes an end-
of-line character to be punched in paper tape.
2. Pressing the Release key on the console. If
the Release key is not pressed, and a record
mark is not encountered before the data at
the highest-numbered core storage address is
written, the machine "loops back" to 00000
and transmission continues.
3. Writing the 80th position in card output buffer
storage.
4.
Loading the 197th character into the Printer
buffer, or sensing of a record mark or group
mark in core storage. The print buffer contains
197 positions even though the 1443 prints only
120 or 144 positions. A record mark or group
mark should be placed in positions 121 or 145
to prevent possible Printer Checks caused by
the transmission of unedited positions. The
terminating record mark or group mark is not
transferred to the print buffer and all remain-
ing buffer positions are reduced to blanks, in-
cluding the record mark or group mark posi-
tion. A record mark or group mark at the P
address causes the buffer to be loaded with
blanks and a "blank line" to be printed.
5. A record mark or group mark terminates oper-
ation of the Plotter also.
Each numeric character in core storage, and its flag
bit
(if
any) is written on an output unit, and the char-
acter in core storage remains unchanged. No alpha-
meric or special character represented in core storage
as two numeric characters can be written on an output
unit as a single character ·by this instruction.
Execution Time. Execution times for the paper
tape reader and typewriter depend on the speed of
the output unit selected and the number of characters
written.
Execution time equals 3.4 ms for transferring 80
columns of data from Core storage to 1622 output
buffer storage; the print buffer is loaded in 8.06 ms
(120 or 144 characters).
Although the Models 1 and 2 Plotters require 3.3
ms and 5 ms for each character, respectively; the
CPU
is released after 300 ""sec if one-character records are
used.
Write Alphamerically (WA-39)
Description. Alphameric information from the P
address and from successively higher-numbered core
storage locations is transmitted serially to an output
unit. The units digit (P
6)
of the P part of the instruc-
tion must be an odd number; otherwise the informa-
tion in core storage is not converted correctly to the
Single-character output representation. Transmission
41
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