Tandy PC-6 Manuale utente

ITANDY®

•

ervlce

POCKET SCIENTIFIC COMPUTER

PC-6

Catalog Number:26-3672

CUSTOM

MANUFACTURED

FOR

RADIO

SHACK,

DIVISION

TANDY

CORPORATION

CONTENTS

PAGE

SPECIFICATIONS

•....••..•..•...........•.........•...•....•..•.•........•.•..

How

Open Upper

Case

....................................•............••..

THEORY OF OPERATION

...........•......................•.......••..........

Block Diagram

...•..•••..••••...•.•..........•..•.........•.•.....•.....•••.

LSI

•.............................

......................•.......•.........

Ram

Map

...••.....•••..........•...........•........•.......•.............

Buzzer Control Circu

•..........................................•...........

Interrupt Circuit 6

Keyboard

.•.................................................•.........•...

Power Supply

........•.....................................................

LSI (Pin Functions)

.....•.....•...•.............................................

DISPLAY

•..............•..........................................••.........

TROUBLESHOOTING GUIDE

.......•...........................................

Test Programs

Operation Check

........................................•...•.•.•.....•....

PCB

ASSEMBLY VIEWS

.......••..........•..•.......•........................

PARTS LIST

...........•..•...........................•......................

Electrical

Parts

.........•.................•.........•......................

,20

Mechanical Parts

..................•........................................

EXPLODED VIEW/DISASSEMBLY INSTRUCTIONS 23

SCHEMATIC

DIAGRAM

...•...•...........•....................................

Main Block

..............••........•..•.....•.............................

Keyboard

.•....•.••.............••........••..•..........................

Display

.........•.•..••..••.....•.•.......•..••..........................

Display Method

Display

Calculation

Range

Program System

Program

Language

Number

Variables

RAM Capacity

Program

Areas

Number

Stacks

Subroutine

FOR

LOOP

Operators

Power Supply

Power Consumption

Battery Life

Memory

protection

battery

Auto

Power-off

Ambient Temperature

Dimensions

Weight

SPECI

FICATIONS

5 x 7 dot-matrix crystal

24-digit, dot-matrix liquid-crystal display

10-

±9.999999999 x10

Stored System

BASIC

26 fixed variables, exclusive character variable

and

array variables

7520 bytes (system

area:

672 bytes)

Maximum

(PO

through

P9)

levels

lithium

batteries (CR-2032)

for

main frame

lithium

battery (CR-1220)

for

memory backup

Maximum 0.07W

Continuous program execution: approximately 85 hours

2) Continuous display

5555555555 at 68° F(20°C): approximately 200

hours

5.5 months when

unit

used

1hour per day

NOTE: 1hour includes 10 minutes

condition

and

50 minutes

con-

dition

Approximately 2

years

(with main batteries installed)

Approximately 6minutes

32° F

104°F

(O°C

40°C)

3/4"H

5-5/8"W

2-3/4"D

(18 mm x142 mm x

mm)

5.8 oz (165 g), including batteries

How

Open Upper

Case

Tweezers

Insert the tweezers

into

the back

the upper

case.

Move tweezers gently in the direction indicated

the

arrow in the figure below.

-3-

THEORY OF OPERATION

Block Diagram

KEYBOARD

a1"Va6, d1"Vd6

b1"Vb6, e1

"Ve6

"Vc6,

RD"V

R14

Km1"VKm12

DOT-MATRIX

DISPLAY

5x7dots,

digits

a7"Va12, d7"Vd12

b7"Vb12, e7"Ve12

c7"Vc12, RD"VR14

D1-D8,OP,

CE, C1,

GATE

ARRAY

IC4

MB64H193

RAM

IC3

HM6264ALFP

OPTIONS

26-3671

26-3651

CMT

26-3652 26-3652

NOTE:

Only

one

2options

can

connected

time.

-4-

LSI

Main

CPU

HD61747B20

Sub

CPU

HD61747B25

Gate

Array

MB64H193

RAM

HM6264ALFP-5Q,

BASIC

control,

Key signal

input/output

(lower keyboard), 1st

6th

digits and

13th

18th

digits display control.

Calculation,

I/O

control, key signal

input/output

(upper keyboard),

7th

12th digits and 19th

24th

digits display control.

Interface between

CPU

and RAM, buzzer control.

Stores data and program. RAM

has

bytes

(64K

bits) capacity and contains

aself-control circuit.

Ram Map

LSI ROM

RAM

CPU

(Main)

HD61747B20 113024 bits 1896 bits

CPU

(Sub)

HD61747B25 113024 bits 1896 bits

RAM

HM6264ALFP-50 65536 bits

TOTAL

226056 bits 69328 bits

nput

Buffer

Code Buffer

POT

MFT

P5T P4T P3T P2T

P9T P8T P7T P6T

RAM

Variable

P9B

READ#No.

DATA#P

DATA

P#X

IN-

KEY

IAddress

GOSUB STACK

DISP Buffer

Varia-

ble

STEP

I~aria-

Address

ble

No.

000

080

FOR

-5-

I~aria-)j

ble

l~aria-..1

ble

No.

PASS

IIPRT I

DEFM IMODEI

Address kj i

Users

Area

Communication Buffer

Variable check I

FF I

100

180

Buzzer Control Circuit

There

are

3ways

operate the buzzer:

Key

input,

BEEP

0, and

BEEP

Mode

Frequency

Time

BEEPO

0.9 kHz

110

msec.

BEEP 1

4.55 kHz

110

msec.

Key

Input

4.55 kHz

msec.

82 t----=1..-

..,.,....,

----

M864H193

---.fLJLJL

8LSlSlJ

Interrupt

Circuit

•

Interrupt

circuit

for

the clock pulse when

VDD2

drops.

When

the power

on,

VDD2

"L"

level.

PG2

through the ICand 26th pin

the

CPU

receive

PG2.

When

VDD2

drops, the

output

the IC becomes

"GND"

level and the

CPU

does

not

receive

PG2.

PG1

HD61747825

f---

PG2

VDD2

•

Interrupt

circuit

for

the voltage

the Gate Array and options when

VDD2

and

drop.

When

the power

on,

VDD2

and

"L"

level.

VDD2

for

Gate Array and

VDD4

also

"L"

level.

When

VDD2

drops,

VDD2

for

Gate Array

and

VDD4

becomes

"GND"

level and stops the op-

ration

the RAM and options.

sw~

VDD2(from

IC 4)

VDD4

VDD2(from

IC 2)

Keyboard

HD61747B25 controls the upper keyboard.

Ks2

Ks3'VKs8 Upper

HD6174782 Ks9, Ks10

KeYboard

HD61747B20 controls the lower keyboard.

Km1'VKm4

Km5'VKm10 Lower

HD6174782 Keyboard

Km11, Km12

-6-

Power Supply

VSSl

VRAM

VlrvV5

VDDl

VDD2

Power supply voltage

for

TC4071 BF.

Memory

used

keep the voltage

for

the RAM.

LCD drive voltages. Voltage

generated

connecting the external resistor

VDD2.

Power supply

for

the

CPU,

RAM and options.

Stays

VDDl

at power-on.

Goes

GND at power-off or APO (auto power-off).

-7-

LSI

(Pin

Functions)

IC1

IHD61747B20

IC2,HD61747B25

Pin No. Signal Name

In/Out

Function

1'\,,4

D1,2,4,8

In/Out

Data

in/out

(D1, D2, D3, D4)

5INT

Interrupt

signal from

RAM

6'\,,18 KM'\"K1

In/Out

Key signal

for

keyboard

In/Out

Switch signal. GND

switch

"OFF"

and

VDD1

switch

"ON".

20'\,,24 V5'\"V1

Out

Display voltage. Divided vol-

tage from VDD1.

25,26

PG2,PG1

Out,

In CPU internal clock

27'\,,72 R15'\"R7

Out

Display signal

GND In GND

CE2

In/Out

Chip designating signal.

Select RAM

other

devices

CE1

In/Out

Select RAM

other

devices

VDD1 In Power source

77 VDD2

Out

VDD1

output

from

the

LSI.

VDD1

switch

"ON"

and

GND switch

"OFF".

78,

1/)1,1/)2

In/Out

Clock pulse

In/Out

Operation

signal

~:e:

80w

~ ~

o0 U

U<:J

> >

.....

NM<::t

~~a:~~

o:o:o:a:a:~~<g:g~~

INT

K12

K11

K10

IC4,MB64H193

100

106

ADO

107

AD1

VSS

AD2

AD10

AD3

CSO

AD4

CS1

AD11

CS2

coco

(J)

r-- 0

0 0 s

(fJ (fJ (fJ (fJ

« «

««

««>a: UUU U

Pin No. Signal

Name

In/Out

Function

1,2

100,106

In/Out

Data

in/out

ADO

Out

Address

signal

4107

In/Out

Data

in/out

ADl

Out

Address

signal

6V55 In Power source

7,8,9

AD2,

10,3

Out

Address signal

Out Output

enable

11'V18 AD4'VAD12

In/Out

Address

signal

VDD In GND

Out

Read/write

signal

22'V24

CS6'VCS3

Out

enable

signal

25'V27 C52'VC50 -

28,29

Bl,

Out Buzzer signal

30 52 In GND

V55 In V55

In GND

33 E-

34'V37

D4'VDl

In/Out

Data

in/out

In Operation

signal

39,40

C2,Cl

In Clock pulse

VDD2 In Power

sou

rce

In Chip enable

VDD

In GND

44'V48 103'V105

In/Out

Data

in/out

-8-

IC3, HM6264ALFB-50

GND 14

Pin No. Signal Name

In/Out

Function

2'V10 A12'VAO In Address signal

11'V13 1/01'V1/03

In/Out

Data signal

GND In VSS terminal

15'V19

1/04'V1/08

In/Out

Data signal

CE1

In Chip enable

A10

In/Out

Address signal

Out

Output

enable

23'V25

A11,9,8

In/Out

Address signal

CE2

GND

RIW

In Read/write signal

VDD In GND

DISPLAY

Numbers and characters are displayed

5 x 7 dots.

Following

an explanation

adot-matrix

LCD.

e12

c12

a12

60606

00000

Lower electrode

00000

00000-----------00000

00000

090

d12

b12

R8-o0000

00000

R9--D0000

00000

RIO

-00000

Upper electrode

00000

Rl1--Q0000---

----00000

R12-o0000

00000

R13

-aoooa

00000

1"14

-00000

00000

"----------"Vr---------

Left-half 12 digits

e12 c12 a12

~O~O~

do~o~

00000 00000

00000

Lower electrode

00000

00000---

----00000

00000

00000 00000

O?O?O

090?0

d12

b12

00000

OOOOo-RO

00000

OOOOD--RI

00000

Upper electrode

0000D-R2

00000---

---OoOOcr-R3

00000

0000~R4

00000

OOOOo--RS

00000

0000CJ-R6

"--------

"V_-------~

Right-half 12 digits

+++-t+-I-+++-++-+

-R0

--+++++++++-If+t-I+t--R1

--+++-++++++-1++-+++-R2

--+++-+++t+t-tt++H-

--+++-+++-I+t-t+++H-RL.

-+++-+f++f++t+-t++--

-++++H-++-H+t-H+--

the

upper

electrode

the

LCD,

common

signals

RD'V

R6 and

R8'V

R14

are applied horizontally while

other

signals

al'Vel

a12'Ve12 are applied

vertically

the

lower electrodes as shown in above figures.

the

left figure,

the

upper-right

corner

the

dot

displayed when avol-

tage difference exists between signals

and

al.

The

CPU

outputs

the

dis-

play signals

the

LCD

display.

CPU

HD61747B2D

controls

the

1st

6th

and

13th

18th

digits

dis-

play, while HD61747B25 controls

the

7th

12th

and

19th

24th

digits.

-9-

-----~-----------------------------------------

TROUBLESHOOTING GUIDE

Symptom Cause Solution

display

all. Weak batteris Replace

the

batteries.

Poor battery

contact

Clean

the

battery and

contact

spring.

Lift

the battery spring.

Peeled heat seal Replace the heat seal.

Broken heat seal Replace

the

heat seal.

LCD

(CA51-TS) Replace the

LCD.

LSI

(HD61747B) Replace

the

LSI.

Acertain segment(s) Peeled heat seal Replace the heat seal.

cannot be displayed. Broken heat seal Replace

the

heat seal.

LCD

(CA51-TS) Replace

the

LCD.

LSI

(HD61747B) Replace

the

LSI.

Calculation impossible.

LSI

(HD61747B) Replace

the

LSI.

Acertain

button

does

not

Poor key

contact

Celan the

contact

pad on the

PCB

and

the

function. key

contact

rubber.

Broken

line Connect the

line.

Peeled heat seal Replace

the

heat seal.

LSI

(HD61747B) Replace

the

LSI.

-10-

-----------~--

-----------

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