Key Hoard Specifications; Keyboard Interface - Sharp MZ-5500 Tehnical Manual

11. KEYBOARD AND KEYBOARD INTERFACE
11-1 Keyboard specifications
.. Intelligent keyboard containing the BOC49 processor.
.. Mode indicators for CAPS' , and GRAPH.
.. 63 byte input buffer.
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Two types of repeat functions can be specified by CPU
.. Twokeyroll -over . commands .
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Fig. 11-1 (In the ca se of English type)
Special Keys
SHIFT : Used for uppercase shift or to provide the upper
case shift functions (F ll-F20) for the function
keys (F1-Fl0).
CAPS :
Used
10
fix shift character selection. If it is used
LOCK
with the Shift key, the shift and normal mode
will be reversed .
GRAPH : Selects Graphie mode.
CTRL : Used to generate compressed commands.
ALT :
Used to generate extended commands.
Keyboard mode
1)
NORMAL mode: All keys on the keyboard are operative
(to generate one byte data).
2)
GRAPH mode : Selected with the GRAPH key to place
the keyboard in the graphie mode (1
byte da ta ).
Notes : .. ro clear the selected mode, operate' the same
mode select key or keys a seco(ld time.
.. If the CTRL and ALT keys are depressed, the
keyboard is placed in the normal mode (CAPS
and SH I FT keys operative), with the exception
that every piece of data consists of two bytes,
with the first byte assigned to a CTR L ALG
code, and the second byte assigned to the entry
code.
Description of special keys
(Al SHIFT key
.. Used
10
place the keyboard in the shift mode (used with
other keys) .
.. Operation of the SH I FT key alone is invalid (no code is
transferred to the CPU).
(B) CAPS key
.. Used for shift character selection.
.. Operative only in the normal mode .
.. If used with the SHIFT key, shift and normal selection
will be reversed .
.. If the CAPS key alone is used,
0.0
operation will result
(no code is transferred to the CPU).
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(C) GRAPH key
.. Used to place the keyboard in the Graphie mode. When
opera ted, the pertinent code is transferred to the CPU
(operation of the GRAPH key alone is valid).
.. AU other keys produce the codes the same as those in
the normal mode.
(0) CTRL key
.. When this key is operated, entry da ta consists of two
bytes: anormal-mode key code followed by a CTAL
code. Operation of the mode keys (GAAPH) are ignored .
After the CTR L key is operated, the CAPS and SH I FT
keys remain valid.
.. Operation of the CTR L key alone is not valid (no code is
assigned).
(E) ALT key
.. . After the ALT key is operated, entry data consists of
two bytes (same as for CTAL),
.. Used to genera te extended command codes .
..
..
Effective when used with other keys.
The pertinent code is transferred to the
operated_
CPU when
11-2 Keyboard interface
(1) Block diagram
rs. . .
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Fig. 11-
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