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MZ-IR12
1. OUTLINE
The MZ-1R12 (S-RAM board) can be used with the MZ-700
either for a boot loader function or as an external memory.
The MZ-1U03 is needed to connect this card to the MZ-700.
Z.FUNCTI6NS
(1) With the M7-700...capahilit)l-f.o,,-b00tiFf§-slmlfltaneotf
S
with the supply of power.
(2) Composed of CM OS-RAMs with backup battery func
tion for capability for use as a static memory.
-
s
(3)
Built-in address counter provides automatic
add res
incrementation for each reading or writing operation
thus simplifying reading and writing of continuou
,
s
data:····
3. CONNECTION METHOD
After confirming that the power supplies of the main un
and the extension unit (MZ·1U03) are OFF, insert this car
into the slot of the extension unit. To turn on the pawe ,
first turn on .the power of the extension unit and then turn
on the power supply the MZ·700.
it
d
r
4. SPECIFICATIONS
(1) Memory capacity
(2) Data hold time
(3) Charging time
(4)
Power supply
(E) Elements used
32K bytes
approx. 44 days
(approx. 1.E months)
100% charge in 29 hours
E VDC
±
10%
CM OS static RAMs
(2K bytes
x
16)
5. BLOCK DIAGRAM
AO A7
10RQ
AD
00-07
AO-A15
f-:..---/
Note The address counter is incremented automati-
cally with the input/output of data.
-2-
6.
DIP SWITCH SETIING
Eight-bit port addresses are output from the ZSO·CPU.
Because three consecutive port addresses are used with
this card, the six high-order bits of the eight-bit address
signal are selected by the switch in order to set the port
address.
.
-
.
--- -- ---
Segment
Meaning
Factory setting
Remarks
1
A2
OFF
I
us~a
or setting the port
address.
2
A3
ON
Used for setting the port
address.
3
A4
ON
Used for setting the port
address.
Used for setting the port
4
AS
ON
address.
5
A6
ON
Used for setting the port
address.
6
A7
ON
Used for setting the port
address.
7
MSEL
ON
Selection of the
P·ROM.
8
An
ON
P·ROM
internal address
setting.
The relationship between the switch position and the logic
level is shown below. The port addresses of this card are
where the logic levels of the address and of the switch are
the same.
Switch position
Logic level
ON
1
OFF
0
Note that the port addresses set at the factory are F8,
F9, and FAH.
The following is the meaning of the addresses selected by
address bits AO and Al.
A1
AO
OUT command
IN command
0
0
Address high-order
Address counter reset
setting
0
1
Address low-order
Data reading
setting
1
0
Data writing
Not in use
1
1
Not in use
Not in use
MSEL and A
11
setting
This S·RAM board has a PROM (for booting the MZ-700)
allocated to addresses $ESOOH - EFFFH. Although this
PROM has a memory capacity of 4K bytes, there is only
2K_hytes of allocated memory space-.. -For-this· reason, the
All bit of the PROM address line is switched ON·OFF to
switch the address and make effective use of the PROM.
Signal
Segment
Meaning when ON
Meaning when OFF
MSEL
7
ROM allocated.
ROM cut off.
All
8
PROM $0000 - $07FF $0800 - $OFFFF ROM
ROM is selected.
is selected.
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