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CEl26P
NOTES:
•
Some of tape recorders may not operate properly owing
to
different
specification
affected
signal distortion, electrical noise, level drop-
by
out caused after long years of use.
•
When using the tape recorder fitted with the mixing
feature, it needs to disable the mixing function for both
recording and playback.
•
Depending
on the tape recorder used, better
result may be attained when the red plug is unplugged
from the MIC jack.
•
As it may impede proper data transfer and verif'lCation
depending on the position of the volume control, tone
control, bass contral, and treble controI, try to find the
optimum level by varying their positions.
4. CIRCUIT DESCRIPTION
The CE-126P has two microprocessors; the P-CPU by which
data traosfer is carried out with the host CPU (M-CPU) and
the printer control PCU. Since the host CPU (PC-1245,
1250, 1251, 1401, (EL5500) have different CPU actions,
the CE-126P CPU therefore performs different action.
M-CPU to P-CPU data transfer method (for PC-1245, 1250,
1251)
, OEYICE SELECT,
SELI
:
~
.
.
_r-u---'
B"'SY~
,
ACL
'
ACL
.
ACK~
PCU1t"".
DWT
4-1.
What action should the P-CPU take prior to data transfer is
dependent on thestate of SEL1 and SEL2 from the M-CPU.
(DEVICE SELECT)
SEL1
L
L
H
H
4-2.
The following actions take place before data transfer.
(1) SEL 1 goes low and SEL2 high.
(2) BUSY trom the M-CPUturns high level.
(3) Upon receipt of BUSY, ACK of the P-CPU is set high
and the data is received to the p· C PU.
Since
the data is transferred in bit by bit serial mode,
above steps (2) and (3) are repeated eight times to complete
transfer
of one data. For instance, those steps are repeated
for 192 times (24 x 8) in order to transfer a 24 digits data.
The print command, however, is sent out to the P-CPU at
the end of the data in a form of the code "00"
or electrical
characteristics
reading
:10)_ .....
_.
~
,,---
~'f'-----
Action
SEL2
Nop
L
H
PCU select
L
Remote ON
H
ACl
Do not sale !
4-3.
M-CPU to P-CPU data transfer
EL5500)
Since there are no SEL1 and SEL2 used for the PC· 1 401
and
EL5500,
DEVICE SELECT
= ..... _ . ....... __
contents of data.
_j, ~ __ .
(UEYlca
SOUT
:~
DOUT
(1) For DEVICE SELECT, XOUT becomes high.
As
(2)
the P-CPU receives a high state of XOUT, it sends
ACK to the M-CPU.
As
(3)
the M-CPU receives ACK, it sends back BUSY.
(4) Oata is received to the P-CPU with a high state of
BUSY. ACL, REMOTE ON, CPU select actions
carried out depending on the contents of data.
4-4. Print data transfer
(DATA
SOUT
__.,f!_._.IL_,
IIlJSY
ACI!
/\
~
XOUT goes low when the print data is transferred.
transfer is done in a manner identical to those of the PC-
1250.
-2-
method
(for PC-1401,
is dependent
on the
SELECT)
J
t
;--V"\
11IAHSPORTATlOH)
I
I.
Bl1'1I1I
:~
L
is
Data
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