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iBM 1816 Priflter-Keybuard and iBM 1053
Print~r
The
IBM
1816 Printer-Keyboard provides console-keyboard
entry and cons0
1
e-printe
r
output for the 1800 system. The
IBM
1053 Printer provides additional output typewriter
printers for the 1800 system. A maximum of two 1816's
and six 1053 's, or one 1816 and seven 1053 's, or eight
1053's can be attached to the 1800 system.
The printer portion of the 1816 is physically and
functionally the same as the 1053 Printer. Therefore, the
printer description is the same for these two units.
Printer
The printers provide output at a maximum rate of 14.8
characters per second and operate under direct program
control. Data and control characters (space, tabulate, etc.)
are sent to the printer by means of a write command
issued to the printer. One data or control character is
transferred to the printer by each write command. When
a character is received, the printer either prints the
character or performs the control function specified by
the character.
Keyboard
The input speed of the keyboard is 20 characters per
second. The keyboard is also under direct program control.
When a key is struck, a coded character representing
the key struck and a keyboard service interrupt are emitted
by the keyboard. The keyboard service interrupt signals the
program that a character is ready to be read into main
storage. The character will be read into main storage by a
subsequent read command from the stored program.
Keyboard entries are not automatically printed. The
processor-controller must be programmed to provide a
printed output for each keyboard entry.
OPERATOR CONTROLS, KEYBOARD (Figure 20)
The Tab Key causes the print-element carrier to move to
the next tab stop when pressed.
The REST KBD (Restore Keyboard) Key, when pressed,
unlocks the keyboard, releasing any key that is down.
Pressing processor-controller console RESET also unlocks
the keyboard.
The KBD REfL' (Keyboard Request) Key, when pressed,
causes an interrupt which signals the program that a key-
board entry is desired. The proceed light is turned off
when this key is pressed.
The HOF
(Hnd-OJ~j<'ield)
Key is effective only when the
proceed light is on. Pressing this key enters a character
indicating that no further characters are to be sent in this
message.
TIle ER FLD (Erase Field) Key is effective only when the
proceed light is on. Pressing this key enters a character
indicating that the message being entered is to be deleted
and replaced by a corrected message.
58
IBM 1800 Operating Procedures
The Return Key, when pressed, causes the carrier to return
to the left margin stop and advances the form a single or
double space depending on the line-space lever setting.
The NUM (Numeric) Key is effective only when the pro-
ceed light is on. Pressing this key places the keyboard in
numeric (upper case) mode. The keyboard remains in this
mode until changed by pressing ALPHA.
The ER CHR (Erase Character) Key is effective only when
the proceed light is on. Pressing this key enters a character
indicating that the iast character entered is
to
be repiaced
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The ALPHA (Alphabetic) Key is effective only when the
proceed light is on. Pressing this key places the keyboard in
alphabetic (lower case) mode. The keyboard remains in
this mode until changed by pressing NUM.
The Space Bar is effective only when the proceed light is
on. Pressing the space bar moves the print-element one
space to the righ
t.
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