Table of Contents
Advertisement
(PRU9103/9105). The bit definitions in both
figures are the ASCII bit definitions.
Paper Tape Format
Whatever distance the paper form is fed
through the printer during a given period of time,
the format tape is fed an equal distance through
the photoelectric reading station. The format tape
is thus a gauge of the longitudinal dimension of
the form. Generally, the length of the tape equals
the height of a single form; when the ends of the
tape are joined, there are exactly as many
exposed frames on the tape as there are single
spaced lines (printed and blank) on the form. The
printer uses a six or eight lines per inch format
tape, depending on the setting of the FORMS
RESET toggle switch on the control panel of the
printer.
A format tape is supplied imprinted with six
or eight frames per inch to facilitate location of
the punches. Generally a new tape must be
mounted if
(1)
the height of the form is changed
or (2) a change is made in the number of lines per
inch printed, with one exception. If, and only if,
all formatting holes arc punched opposite the
sprocket holes, the tape can be used for either six
or eight lines per inch printing.
Vertical Format Unit
Printers that contain Option PRF910 I allow
paper spacing to be controlled by a 12-channel
paper tape. The unit consists of a vertical format
tape and tape reader that are located on the
right-hand side of the printer under the machine
cover.
The vertical format tape must be punched
with the same spacing (six or eight lines per inch)
as the printing it will control. A six line per inch
punch and blank tape are supplied with the
printer. Additional tape and punches for either
six or eight lines per inch are available from
Honeywell. The tape should be glued into a loop
exactly as long as the form (or an integral
multiple of the length, with identical punches for
each page controlled).
PERIPHERAL COMMANDS
Line printer operation is implemented by two
sets of instructions; the input and the output
commands (see Table 7-3). A discussion of these
commands will be found in the Series 60 (Level
6) Minicomputer Handbook, Order No., AS22.
STATUS BITS
One status word, is defined for the line
printer. Figure 7-5 illustrates the status bit assign-
LINE PRINTERS
7-4
ments and Table 7-4 defines the status bits and
the means by which each bit is reset. Reaction of
the MOC to printer errors is as follows:
o Errors detected during data transfer will be
stored in a status word for interrogation by
a subsequently issued order.
o Errors occurring on I/O commands from
the central processor will set the appro
priate status bit and interrupt the processor
immediately (that is if interrupts are
allowed).
The
I/O
command will be
acknowledged normally and stored in MOe
memory but will cause no further action. If
interrupts arc blocked (Level
=
0), the
command in error will be used as if there
were no error.
TABLE 7-3. COMMAND REPERTOIRE
Function
Type
Command
Code
Output
03
Output Interrupt Control
01
Output Control
09
IOLD (Output Address and Range)
07
Output Configuration
Input
02
Input Interrupt Control
08
Input Memory Byte Address
OA
Input Memory Module Address
OC
Input Range
06
Input Configuration
18
Input Status
26
1
Input Device Identification Code
IFor the Line Printer the device number is: 2000 (PRU9104/
9106); 2002 (PRU9103); 2003 (PRU9105).
PROCESSOR INTERRUPTS
Conditions that will cause a processor inter
rupt are:
o Interrupt level non-zero and previous oper
ation complete
o Interrupt level non-zero and error on I/O
command (see paragraph entitled Status
Bits)
o Completion of a stop I/O
o Termination of an IOLO command due to
a device fault
AT04
Advertisement
Table of Contents
