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5-9. Printer control
z|
a
|
Lv) ie)
a
2 QO 12) = N
|
c= 4 o
ms)
ST
!
alg"
BS
m
=
|
vu
a n
|
PS) m n
|
fe)
Pe)
fo)
: Interrupt request
3. 58MHz
Printer
Controller
CPU
LHO0080
(uPD780)
Chip: Select ;
Decoder
SN74LS139
Printer Unit Side
: Dot wire select........... 'DT1~DT7
Printer motor drive ........0.5. MOT
: Paper feed...
ee ce
eee
PFM
: Printer-resets
es cvseceieesscts
BR
: Printer timing:
2
eve c
eee ee eee T,T'
: Validation: paper sense (Right)
... VALR
+ Validation paper sense (Left). ....
VALL
: Paper near end-sense
: Printer.controller select
: Reset with power on
21/0 request
or
BE-2520
Printer
Receivers
Dot printer
Printer contro! Block Diagram
Fig. 13
5-9-1.
Printer signal description
a
aes
VALR | Validation paper sense (Right sidé)'
Paper in: Low
Validation paper sénse (Left side)
Paper in: Low
Roll paper end
Paper near end:
Low
Printer Controller chip select
Dot wire (1) select
Dot wire (7) select
Select: Low
Motor drive
{Motor on: Low
R
, T, T' aré generated from the printer with motor on.
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