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pins which ensure proper positioning and a plastic
hook to ensure locking.
The operator replaces the cartridge as neces
sary to ensure high quality printing. The follow
ing text defines cartridge loading procedures:
1. Turn the device OFF.
2. Position the ribbon between the platen and
the print head mechanism.
NOTE: A segment of the ribbon is exposed
at the head of the cartridge (see
Figure 8-6).
3. Gently draw the cartridge away from the
print mechanism (a segment of tape will be
released).
4. Carefully position the cartridge on the
reference pins and the plastic locking clip.
5. Turn the tension knob on the face of the
cartridge to increase the ribbon tension.
6. Turn the device ON.
INTERCONNECTION/SYSTEM INTERFACE
The Keyboard Typewrite Console Attachment
consists of a device controller, console adapter,
and a console compatible peripheral. Figure 8-6
LEV E L b MEGi,BUS
--..,
1- - - - -...,
I
I
I
I
I
UNIT
I
1
I
I
' -- _ _ _ _ _ J
I - _ _ _ _
---.J
MUL TIPlE
DEVICE
KEYBOARD
CONTROLLER
TYPEWRII Ef!
I
CONSOLE
ADAPTER
l
KEYBOARD
TYPEI!;'RITER
CeNSOI E
Figure 8-6. Device Interconnection/System
Interface
illustrates the structure of the subsystem and its
relationship to the system.
The device controller is a microprogrammed
peripheral controller which attaches to the Level
6 Megabus and is capable of supporting up to 4
devices via a configurable series of adapters.
Device specific functionality is provided by the
adapter and certain device specific firmware in
the device controller.
PROGRAMMING CONSIDERATIONS
Level 6 software allows for the transfer and
receipt of data from and to the console through a
series of Input/Output programming commands.
These commands and their associated meanings
are summarized in Table 8-1.
Table 8-1. INPUT/OUTPUT COMMAND SUMMARY
Type
Command
Function Code
Input
10
02
10
OC
10
10
10
12
IO
18
IO
26
10
08
10
OA
10
06
10
lA
Output
10
03
10
01
IOLD
09*
IO
11
10
13
10
07
Meaning
Input Interrupt Control
Input Range (ReSidual)
Input Configuration Word A
Input Configuration Word
B
Input Status Word
Input Device ID
Input Address (Lower
16
bits)
Input Address (Upper
8
bits)
Input Task Word
Input Attention Character
Output Interrupt Control
Output Control
Output Address and Range
Output Configuration Word A
Output Configuration Word
B
Output Task
*The low order bit of the channel number of this command specifies the direction of the data transfer (i.e., input or output). The low
order bit of the channel number is ignored on all other commands.
KEYBOARD TYPEWRITER CONSOLE
8-5
AT04
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