Operation; Set Tabs, Margins, And Spacing; Clear; Status Checking - Control Data 3100 Reference Manual

Used in conjunction with block control and the Register File, the typewriter may be used
to enter a block of internal binary-coded characters into storage and to print out data
from storage. The two storage addresses that define the limits of the block must be
stored in the register file prior to an input or output operation. Register 23* contains the
initial character address of the block, and register 33 contains the last character address,
plus one. Because the initial character address is incremented for each storage reference,
it always shows the address of the character currently being stored or dumped. Output
operations occur at the rate of 15 characters per second. Input operations are limited by
the operator's typing speed. In systems using the optional 3101 desk console, the 3192 is
an integral part of the console.
OPERATION
The general order of events when using the console typewriter for an input or output
operation is:
1.
Set tabs, margins and spacing. Turn on typewriter.
2.
Clear.
3.
Check status.
4.
Type out or type in.
SET TABS, MARGINS, AND SPACING
All tabs, margins, and paper spacing must be set manually prior to the input or output
operation. A tab may be set for each space on the typewriter between margins.
CLEAR
There are three types of clears which may be used to clear all conditions (except Encode
Function) existing in the typewriter control. These are:
• Internal Clear or a Master Clear.
This signal clears all external equipments, the communication channels, the
typewriter control, and sets the typewriter to lower case.
• Clear Channel, Search/Move Control, or Type Control instruction (77.51).
This instruction selectively clears a channel, the S/M control, or, by placing
a "I" in bit 08 of the instruction, the typewriter control, and sets the type-
writer to lower case.
• Clear Switch on typewriter.
This switch clears the typewriter control and sets the typewriter to lower case.
STATUS CHECKING
The programmer may wish to check the status of the typewriter before proceeding. This
is done with the Pause instruction. Status response is returned to the computer via two
status lines.
The typewriter control transmits two status signals that are checked by the Busy Com-
parison Mask using the Pause instruction. These status signals are:
Bit 09 Type Finish
Bit 10 Type Repeat
An additional status bit appears on sense line 08. This code is Type Busy, and is transmitted
by block control in the computation section when a typewriter operation has been selected.
If the programmer is certain of the status of the typewriter, this operation may be omitted.
*The upper nine bits of registers 23 and 33 should be "0".
Rev. B
6-2