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MZ3500
10-5. keyboard controller signal description
PIN
No
1
2
3
4
5
6
7
8
9
10
11
12
19
20
21
22
23
24
25
26
27
30
31
32
34
35
36
38
39
40
Porality
signal
name
TO
XTAL1
XTAL2
RESET
SS
INT
EA
RD
PSEN
WR
ALE
DBO
DB7
GND
P20
P21
P22
P23
PROG
VDO
P10
P13
P14
P15
P17
P24
P25
P27
T1
Vcc
IN/OUT
IN
IN
IN
IN
IN
IN
IN
-
-
-
-
IN
IN
OUT
OUT
IN
-
IN
OUT
-
OUT
IN
IN
IN
IN
Function
Output data signal from the sub CPU (D(O)
Internal clock oscillator crystal input
Internal clock oscillator crystal input
Processor initialize
+ 5V
Strove of D(C) that also is used for interrupt to the keyboard side (ST(O)
GND
NC
NC
NC
NC
RETURN signal from the keyboard is input when a key is pushed during key search
0V supply
Output data signal from key (D(K))
Strobe of D(K) which also is used for interrupt to the CPU side (ST(K))
Not used
NC
+ 5V
Strobe to the keyboard unit by which a hexadecimal code is sent out for generation shift pulses
to terminals X O X 1 5 o f t h e 4 5 1 5 decorder during key search
NC
Pins used to activate the keytop embeded LED
#32 pin Alphabets and symbols (LOCK)
#33 and #34 are not used
Not used
Keyboard type identifier pin Keyboard type is identified by mears of KSO, KS1, KS2 of KUC1
an KUS2. whether it is GND or NC
Acknowledge input from the CPU (ACK(O) Sent only when the CPU receives a correct data
+ 5V supply
11. SELF CHECK FUNCTIONS
The -3500 performs self-check test during initial program
loading of the ROM. 11-1.
Test regarding the main CPU
1) MFD I/F. 128KB RAM. 16KB ROM (for ROM based
machine) checks
[Procedure]
1. Turn on all dip switches of the 4 bit switch (located in
the middle of the front side of the board) and turn on
all dip switches of the 2 bit unit on the front side of the
board.
2. Insert a floppy disk into drive unit No 2 (the third drive
unit)
3. Turn the power on
4. The LED flickers for a moment then the test program
starts During execution of the test program, the LED
stays unlit
About four seconds later
the result is
mdicsted
(DISPLAY)
(1) LED comes activated after normal ending of the test
(2) LED flickers after abnormal ending of the test
The kind of error can be known by how the LED is activat
ed and flickered
LED (fof id«niific«Tion of GO/NO GO)
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