Sharp PC-1211 Manuale utente

SHARP CORPORATION

CONTENTS

Specifications

. .

. . . . .

. .

. . . . . .

. .

. . . . . .

2. Block diagram

. . . . .

. . . . . . . . . . . .

. . . . . .

. .

. . .

. .

. . .

. .

LSI signal description

About servicing

Cassette operation

. . . .

. .

. . . . .

. .

. . .

. . . .

. . . . . . . . . . . . . . . . . .

6. Check program

· · ·

Circuit diagram

. . . . .

. .

. . . .

. . .

. .

. . .

. .

. . . . .

. .

1211 parts list & guide

· ·

121 parts list

guide

. . .

. .

. . . . . .

. .

. . .

· ·

· · ·

· ·

· · ·

MODEL

PC-1211, CE-121

----SHARP----

SERVICE

MANUAL

Add

(+)

Subtract(

)

Multiply

(+),Divide(/)

Power raising

(

)

Trigonometric

funct

ons

SIN(sine)

COS(cosine)

TAN(tangent)

Inversetrigonometric functions: ASN(sine

), ACS

(cosine

ATN

(

tangent

)

Logarithmic functions: LOG(common logarithm), LN(natural

log

rit

[

]

)

Exponential functions: EXP(exponential)

Angulartransformations: DMS(decimalnotation to sexagesimal

)

DEG(sexagesimalnotation to decimaln

ota

)

Square root extraction:

Signum

function

SGN

Absolute

val

ABS

(IX

Interization: INT

Execution of arithmetic operation

commanded by the ENTER key

1-3

Arithmeticfunctions

•

Buffers

•

Capacities

digits of mantissa and

digitsof exponent.

According to mathematical formula (with priority consideration

andjudge function)

Programmemory; 1424

steps

max (PC1211)

Data memory; Fixed memory

26 memories

Flexible memory (commonly usable with the

programmemory)

178 memories

max (PC1211)

Reserveprogram; 18 kinds, 48 steps

max

Input buffer; 80 steps

Data buffer;

stages

Functional buffer;

stages(but

stagesfor

parenthesis

)

Subroutine buffer; 4 stages

"FOR NEXT" stagement

buffer

4 stages

•

Computational capacity:

•

Computational method:

1-2. Basic

functions

•

Displaytube: LF8017JE

•

Displaymethod:

dot matrix liquid crystal

•

Displaycapacity: 24 coulumns (alphanumerics and symbols)

1-1

Display

ITJ []]

El G

DEL

w w

G] [[] []]

[

MODE

WER

IT] [TI 0

OJ OJ

[

" #

•

;

~ ~ 0 0

IT]

[!] ~ [I] ~ 0

0 [}] 0 0 0 0 0

IT]

[TI~

IT] 0 [I] 0 0 0 ~ ~

VABLE

KEY

1. SPECIFICATIONS

Data

protection

Program memory, data

memory

reserve program memory

eri

heral unit: Audio cassette unit

(recording

reading of the program memory,

ata

memo

y and reserve program memory)

Physical

imensions: 175(W)

x 7

(D) x 44(H) mm

7. Others

Four MR44 (mercury batteries)

0 hours

0.01

About 6 minutes

att

ry:

attery life:

sumption:

Automatic

ower shut off:

-6. Power source

Programming language

BAS

(

Beginne

r's

rpose

ymbolic Instruction Code)

....

(right),

(left)

own),

(

)

Cursor shift:

Insert

Deletion

Line control:

1-4. Editorial

functions

0..

Cfl

-e-

...

...::...

~ ~

...

~ ~

;!:

(/)

>::

(/) (/) (/)

L<(

-x:J-i

·-

H-

t--

::J

.....

0..

....

ir:

...

::a

eo co

::il

<- cc

-c

~ rn rn

'' Z<

;:;,

(/)

:i:

11;[

i CJ

> >

:i:

:;;

-'-

r- 00 0

A.. f

:;;:

'.,

-c:

:;:

,___

I+-

,__

0..

i.........:..::

,\\/N ~·l•lt--

...

8V-!V 0

u x

...

(/)

u 0

- (/)

(/)

::il

!OJG

/I-- c,

' l

¥---

·-

°'

er:

s-,

rn rn

"'rn

~ ~U":l

;;;

'--

I+---

>O-

<llO..

(/)

t--

i+--

:>Cl

!.---

.....

L'lCJ

..__

::J

....

L'l

0..

I+--

;::::=:¢

-s-

>::

:'.:

>::

;..

¢=

>::

...J

(/)

•

The CPU

functions to read key-in data or read the instruction to be executed from the

RAM

and decides what

to be done for the control of arithmetical operation (i.e. control of

arithmetic sequence, memorizing of arithmetical

data

and its readout), or interprete the syntax

of the BASICinstruction for deciding what

to be executed, or determines and prepares the

information to be displayed, but the CPU

does not perform any execution by

itself

only

arrangesthe data and information in proper sequence and acts to provideinstruction code to the

CPU II via the buffer. On the other

hand

the CPU II constantly receivesexecution instructions

from the CPU

via the transfer buffer and executes operation against each of instructions or

sometimes performs to exchange data depending on the

situation

Although it sharesmajor part

of execution in term of execution, it performs some kinds of auxiliary CPUwhen looked in the

viewthat it does not perform any decision by

itself

Clockstop

Clockstop control

Power shut off control

Power off

Displayprocessingroutine

Input buffer

Computational result

Error

Arithmetic routine

Character generator

Cassetteroutine

Print routine

Buzzer

Recognition of printer

Key input routine

Acknowledgementof the remaining

program

One instruction to one program step

incorporation

Interpreter:

Programexecute statement

Cassettecontrol statement

Command statement

Printer control

Execution of manual operation

CPU

CPUI

TheseCPUsare provided with internal ROM,and each of CPUsshares the followingassignments:

2-1

System

configuration

(see

the

system

block

diagram)

System of this unit consists of the followingcomponents:

CPU

(SC43157)

2) CPUII (SC43178)

3) 4K-bit RAM (TC5514P

4) Displaychip (SC43125

3, with built-in RAM)

5) 2ANDgate (TC401

UBP

6) 2AND

20R

(TC4019BP

7) Inverter (TC4069BP

8) Quard AnalogSwitchMultiplexer(TC4066BP)

9) LCD (24-digit FEMdot LCD)

10) Key

11) Crystal (CSB2560)

In the case of manual operation of the pocket computer, the instruction code (key code)

written

into the RAMin the display chip (input buffer) after information

put through the keyboard and

converted into the instruction code by the CPU

then this instruction code (display, at this case)

transfered to the CPUII

via

the transfer buffer.

the CPUII receivesthis instruction, the CPU

then decodes this instruction

(display

at this case) and executes display processing. Upon the

completion of this processing,

then notified to the CPUI, then the CPU

confirms the comple-

tion of the task by the CPUII before terminating their jobs.

CPU

Ex: Actions of CPU

and CPU II at the time of key data entry.

Although RAM area is mainly shared by the

program

data

and reserve program

memories

also used for the sub-

routine stack, FOR NEXT statement stack and fixed

memories

1536

1472

1504

001

048

(PC1211)

Reserve

gram

------- - -

Program

flexible

memory

~---

-- -------

Fixed memories (W

Subroutine

FOR

stack statement

stack

A certain number

C-MOS RAM

chips, 4K bits each) and another RAM incorporated inside

the display chip are used in this pocket computer, having varieties of configurations

described

below:

•

Map

4K-bit RAM

153

6 Bytes

2-2.

RAM

;e)

le-

•

Input buffer

Remaining 80 bytes (10 memories equivalent) of the display chip

used for the input

buffer

whi

used in the following

fun

tions:

Any information entered through the keyboard

stored once in this

buffer

thus allowingup

to 80 steps.

2. The display contents

stored by the CPU

and the CPUII makes selection out of this

When an

arithmet

cal instruction

entered

its

rocedure

stored in this buffer by the CPU

and the CPU

performs operation accord

ng to this procedure.

Whenprogram or reserveprogram

be recorded or read out during the execution of the

cassette control

instruction

action takes place through this input buffer.

•

Transfer buffer

bytes

memory

equi

alent) of the

displa

used

transfer buffer

used in

the

transa

on of instruction between the

and the CPUII.

----1}4bit

memory

•

Fixed memory

The total memory of 176 bytes from the display chip

and

used

as a

fixed

memories

(22 memories).

•

8-digitdisplaybuffer

40 bytes of 8-digit display buffer

used

as a

display data buffer during displayingand also used

buffer memory for arithmetical result duringthe arithmetical operation.

128

80 step input buffer Fixed memories

(L-V

memories)

Fixed memories

(A-K

memories)

Transfer buffer

040

8-digitdisplaybuffer 8-digitdisplaybuffer

8-digitdisplaybuffer

000

DISPLAY CHIP

•

Map of the RAM incorporated in the display chip

There are three lK-bit RAMs (128 bytes each) incorporated in each of display chips (SC43125),

having the following

configurations

-1

The

numeri

figure

", to be displayed by the CPU

onverted into the

ele

ant character

code and carried through on the address data bus

First of

all

the segment Sl

selected with the

address

A8-Al "

00000000" to

tore the data DI04-DI01

"1000

he display buffer

(see

2-3-1

). To store second half 4 bits of the

data

only

in the address in

urned

" to make the

address "00010000" to store data

0001". In the same

manner

the address "00000001"

selected

for storing the first half

bit data

100" for he segmentS2 and the

ond half 4

bit data

000

stored with the address "00010001 ".

S40

S32

S34

Sl6

Sl7

A5=0

A5=1

DI04 DI02 DI04 DI02

'--------..,..-~

Addr

0 0

)

0 0

)

A6 A4

DDD•D

oo••

o•o•

•oo•o

•••••

ooo•o

S4 S5

Displaying numerical figure

"4"

There are

40=320 bits

(

40 bytes)

of area in the display buffer in the

display chip.

lay

ffer

XOOl 0100

H8 H7 H6 H5 H4 H3 H2

OOl 1000

unter/

decoder

he con

ents of

lay

ind

cated by

he CPU

I is

receiv

by the

via the input buffer and

akes converte

into

respecti

character cod

then they are carried over to the displaybuffer in

lay

chi

p through

he addressdata

bus

•

gnatio

n of the display

ata

followin

struct

re is

observedin the displaybuffer in the display

chip

2-3. Display

the

ata.

.in

HA: Clock frequency for the counter. This signal

counted and decoded to perform

nchroni

zation with the comman

signal

Hl-H7

generated from the CPU

DSIP: With high level of this

signal

processing of display operation

indicated (RAM data

designatedby

Hl-H8

sent out on SI

-S40).

The data stored in the display buffer

carried

rough

SI-S40

(Fig

2-3

2) to be fed

the LCD.

(To

indicat

" on the

dis

lay

H4 and HS

engag

ed for

H3 and

for

etc

all the same

throughout

S6-S40

)

LJl....____flJ

-----------

--------

GND

---

--------.

-----------Vs

Vn1

DI SP

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