Display; Display Adapter - IBM 5100 Maintenance Information Manual

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Display
All data entered through the keyboard is displayed on
the 5100 5-inch screen and is shown on a TV monitor if
one is attached. The display can show as many as
1,024 characters. There are 16 lines per display and 64
characters per line. Each line is made up of 12 rows; 8
rows contain the characters and 4 rows contain blanks
between the characters. (See the display screen
example in this section.)
The display unit can only present the characters
represented in the 2048 x 16 display ROS. These
characters include alphabetic, numeric, and special
characters. When the DISPLAY REGISTERS switch is
active, the display is limited to the 16 hexadecimal
characters.
DISPLAY ADAPTER
The display adapter is on card J2. It receives data from
the 'read data bus' lines through cycle steal controls.
Signals generated by the display adapter are sent to the
display unit and TV monitor to form characters. The
adapter supplies three signals to the display unit and
one signal (the '+monitor composite video' line) to the
TV monitor jack.
ROS Control Lines
Executable ROS
H2
Storage Read Bus
APL Executable
ROS,
APL ROS
C2,D2,D4
Address Bits
Data Bits, and Controls
Data Bits
Common and
Language ROS
E2
Basic
ROS
C4
I/O
Address Bits
and Controls
Interrupt
Controls
Base I/O
F2
Control
Lines
Storage Address Bits
R/W Storage
K2, K4, L2, L4,
M2, M4, N2, N4
Controller
~2
I..---r--.....,r---..
Address Bits
L...-_..,..-_ _ ..,..-_ ..
Storage Address Bits
r---L--.....r..:;.:;:.:~
Bus Out Bits
Device Address Bits
I
I
I
I
1 1 _______ _
H4
Storage
Write
Bus
Display 445