Sharp PC-1261

About 11 minutes
0 to 40°C
6V ::o (DC) li thium battery
(CR2032) x 2
Approximately 300 hours
when all 24 display digits are
indicated with "5" continu-
ously under the operating
temperature of 20 ° C .
Subject to fluctuation depend -
i ng on the type of battery
and usage.
• It w i ll last about fou r
months when used one
hour per day, provided
that 10 minutes are dedi -
ca t e d fo r ope r ation or
program ex ecu t io n and 50
mi nu t es for display i ng .
SHARP CORPORATION
•Battery l i fe :
•Auto power off :
•Operating temperature :
•Powe r supplv:
Mantissa part
..... Statement
-0 . 00001234567898 / 10000
-1. 234567898[-09 -computational results
displayed with exponent
in use
Exponential part
Display character s i ze :
4 . 01 (H) x 2 . 85(W) mm
Pitch : 3.7mm
Batte r y backup to retain pro -
gram, data, and reserve con -
tents during power off
5 x 7 dot matrix LCD
( 24 digits x 2 lines)
( LF8223E)
•D i splay:
•Memo r y protect i on :
Function:
Trigonomet ri c funct i on,
inverse trigonomet r ic func -
tion , logarithm, exponen -
t ial , ang l e conversion,
powe r r aising, square roo t
e x tract , i nteger conversion ,
a bs o l ute v a lue , si gnum
funct i o n, c ir c l e ra t i o , e t c .
Horiz o nt al c ursor shi f t ( .,. . ~ )
Ins e rti on ( I N S )
Del e ti o n ( D EL)
Line up and do wn I l . t)
•E diting funct i on :
•Stack :
•System ROM :
•Memory capac i ty :
•Programming lan guage :
•CPU :
•Computat i on method :
•Ope r ational capac ity:
1 0 d igi t s o f mant i ss a w ith
t wo d i gits of e xponenta ti on
Exac t ly a s th e programmed
stat e m e nt (wit h the pri o ri t y
dete rmi na t ion fe a tu re )
BA S I C
CMOS, 8-bit CPU
40 KB
System a r ea : About 0.6 KB
Data dedicated a r ea:
208 bytes
Program / data area :
PC-1261 : 9842 by t es
PC-1260: 3198 bytes
Reserve area : 48 bytes
Statem e nt program a r ea
( basic capac i ty ) : 128 bytes
Fo r s ubrout i ne u se: 10 stacks
For FOR - NEXT statement:
5 stacks
Fo r function : 16 stacks
For data: 8 stacks
•Basic comput i ng functions : Basic computatio n:
Four math r ules
~00~
0000
0000
[ ~JD0D
1DEF1 §a rn m GJ C8 1 BRK'
@]~[£]~[!:]~@]IT]~ 0
0~@]0 @J [BJ 0IBJ [] E]
SPC
~ ~@] ~ [fil ~ ~ D JENTERJ
PC-1261
PC-1260
MODEL
CODE:OO Z PC1260SM/E
•K eyb oard l a you t:
1 . SPECIFICATION
SERVICE MANUAL
SHARP
-
PC-1260
PC- 1 2 61

Sharp PC-1261 Specifications

General

Brand	Sharp
Model	PC-1261
Category	Calculator
Language	English

Summary

1. SPECIFICATION

Keyboard Layout

Describes the physical layout of the keyboard keys.

Operational Capacity

Details the computational capacity and precision.

Computation Method

Explains how computations are performed based on programmed statements.

Programming Language

Identifies the programming language used (BASIC).

CPU and Memory Specifications

Specifies CPU type and details System ROM and Memory capacity.

Stack Details

Lists the different stack uses (subroutine, FOR-NEXT, function, data).

Computing Functions

Outlines supported math operations and advanced functions.

Editing Capabilities

Describes cursor movement and editing operations.

Memory Protection and Display

Explains battery backup and details LCD specifications.

Operating Parameters

Covers auto power off, operating temperature, power supply, and battery life.

2. SYSTEM BLOCK DIAGRAM

Physical Specifications

Lists the physical dimensions and weight of the unit.

Accessory List

Lists all accessories provided with the device.

3. CPU SIGNAL DESCRIPTION

CPU Signal Pin Details

Details pin numbers, names, and signal functions for the CPU.

4. LCD DRIVE AND TIMINGS

LCD Drive LSI Function

Describes the operation of the LCD drive LSI (SC43536).

LCD Timing Diagrams

Illustrates timing diagrams for LCD display on/off.

Counter & Segment Waveforms

Shows timing diagrams for counter and segment outputs.

5. MEMORY MAP

Memory Map Overview

Visualizes the memory layout of ROM and RAM.

6. CHIP ENABLE LOGIC

Chip Enable Logic Array

Explains the chip enable program logic array.

7. RAM SELECT CE-PLA

PC-1261 Decoder (TC40 H138 P)

Details the PC-1261 decoder logic and truth table.

PC-1260 Decoder (TC40 H000 P)

Details the PC-1260 decoder logic and truth table.

8. MEMORY PWB UNIT CAUTIONS

PC-1261 Flat Type PWB Diagram

Provides the circuit diagram for the flat type PWB.

8-2. PC-1261 MEMORY PWB TYPES

PC-1261 Memory PWB (Flat Type)

Shows the component layout for the flat type PWB.

9. CIRCUIT DIAGRAM

Overall Circuit Diagram

Illustrates the overall circuit layout and component interconnections.

10. CIRCUIT DIAGRAM

CPU, Peripheral, and Memory Circuitry

Details the circuit connections of the CPU, ROM, and RAM.

LCD and Data Bus Circuitry

Illustrates circuit connections for LCD displays and data buses.

Memory and IO Interconnections

Shows interconnections between CPU, memory, and peripherals.

11. PARTS & SIGNALS POSITION

Main PWB Layout and Signals

Shows the physical layout of components on the main PWB.

11-2. PC-1260 MEMORY PWB

Memory PWB Component Layout

Illustrates the component placement on the memory PWB.

12. PARTS LIST & GUIDE

External Parts List

Comprehensive list of external components and part codes.

Main PWB Parts List

Detailed listing of components for the main PWB.

Memory PWB Parts List

Detailed listing of components for the memory PWB.

Device Accessories List

Lists all included accessories with their part codes.