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MZ3500
10.
MZ1K01
KEYBOARD CONTROLLER CIRCUIT DESCRIPTION
10-1. Specification
of
keyboard
control
1)
Input
Buffer
Capacity:
64
bytes
•
Key-in
data
is
written
to the
input
buffer
first,
and is
supplied
to the
CPU, byte
by
byte.
•
When
an
overflow
is
detected,
the
overflow
code
is
affired
to the
key-in data already sent, before being
sent
to the
CPU.
2)
Rollover
• 2 key
rollover (exemption
in the
CTRL mode)
(Entry
of the
second
key
depression
can be
accepted
even
if
more than
one key is
pressed
at
same
time.)
•
Simultaneous
depression
of
more than three
keys
is
ingnored.
3) Key
bounce
15msec
(Key
spec
is
5-10msec)
(Indicates
unstable
state
as
shown
in
Fig.
3-2
that
key
signal
does
not
turn
off
immediately after
releasing
of
finger
from
the
key.)
4) Key
5msec
(norma),
20msec
(max),
15msec (allows
for key
bounce)
5) DEF Key
Twenty
definable keys
are
available
in
combination
with
the
CTRL key.
[
DFK1-DFK10
(DEF1A-DEF10A)
DEF1-DFK10
in
conjunction
with
the
CTRL
key
- - -
(DEFIB-DEF10B)-
(DEF1B-DBF10B)
6)
Handling
of
functional
symbols
and
graphic symbols
See
the
code table.
7) Use of the
CTRL
key to
discriminate
RUN and
CONT
of
the DEB
key.
Push
the DEB in
conjunction
with
the
CTRL
key to
start
running.
8)
Handling
of
special
codes
COPY
command: CTRL
| 1 J
(ten key)
ESCape
CTRL
BRK
CTRL
9)
PRO/OP
Sent
to the CPU
after power
on and
when
PRO/OP
is
changed.
10)
HOME
key
CTRL
[
HOME]
Returns
home after clearing
the
display screen.
[HOME]
Only
the
cursor returns home.
11)
One-step
commands
LMU
/
LML)
o
UMU
4
pft/in
"7 .
PMH
n .
PMn A
PMH
n -
CMU K.
PMH
i
r*Mn
r\ -
PMH
c
12)
Mode
indication
Acrn
uior
rnlNI
INrU
T
USING
(jU
I U
pr\ci
ID
Kb 1 UnN
Lib 1
At
rrn
ULUbt
n
ATA
nrUnMA
1 fF
K.hY
IN
i
OAH
nhAU
CA\/C
on
LED
i
nr^w
13) REP
Key
repetition
will
take place when
a key
depressed
for
more than
0.64
second.
Entry
of
other
keys
is
permitted
during
key
repetition.
When
two
keys
are
depresssd
at
the
same
time,
an
alternate
key
entry
will
not be
accepted.
This
rule does
not
apply
to
simultaneous
depression
of
more
than
three keys.
-
90
-