Sharp PC-4741 Service Manual page 6

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P C-4741
External 5-1/4" FDD (360KB) x 1 port (D-SUB 25
2-2. Specification
2-2-1. Main unit
.~
_ _ _ _ _ _ _ _ _ _ pin, female connecter)
CPU NEC V40 (i80188 compatible)
CPU clock speed - 10MHz (7_16MHz when
coprocessor is installed.)
System speed - Standard/Slow selectable on set-up
menu
Coprocessor Socket for i8087-1 (1 OM Hz version)
NOTE: CPU clock speed is changed to 7.16MHz
automatically when coprocessor is installed.
When it is removed, CPU clock speed is
changed to 1 OMHz automatically.
Memory ROM - 64KB
including BIOS, set-up functions, eG, self check,
etc
512K bits EP-ROM (27C512 type) x 1 piece
ROM-8KB (HD
version
only)
including HD BIOS 64Kbits EP-ROM (27C64
type) x 1 piece
RAM - 640KB standard
256K bits (64K x 4 bits) DRAM x 4 pieces
1 Mbits (256K x 4 bits) DRAM x 4 pieces
without parity
expandable up to 1.6MB with the optional 1 MB
EMS memory card (EMS 4.0)
VRAM-128KB
Display TST (Triple Super Twisted nematic) LCD with one
CCFT (Cold Cathod Flouecent Tube) edgelight
Text - 80 char. x 25 lines, 8 x 16 dots char. Box
Graphics - 640 x 400 pixels, 4-shades of gray (tiling)
Aspect ratio -1:1
Emulation - CGAlMDAlAT&T 640 x 400 Graphics
LCD active area - 205(w) x 155(h) mm
LCD contrast and backlight brightness are adjus-
table by each volume
Not detachable
90 -131 degrees tilt angle adjustment
CCFT backlight
- white color
- life: Approx. 10,000 hours (until luminescent
brightness becomes halD
can be replaced by service man (service parts)
Data storage : PC-4702- two side-mounted 3-1/2" 1.44MB FDD
Right side: A drive, Left side: B drive
Keyboard
-Interface
PC-4721/4741 - one side-mounted 3-1/2" 1_44MB FDD
one internal 3-1/2" 20MB/40MB HOD
Left side: HOD (C
drive),
Right side:
FDD (A drive)
HDD -
average
access time: 29 msec
power
save
management:
can be set "Time-Out*" on set-up menu
Always
ON/2
minutes/5 minutes/10
minutes
:1:: spindle motor of HOD will be control-
led by the value of "Time-Out"
full-size 79-key step keyboard
separate cursor keys
10 programmable function keys
LEDs for Num Lock, Scroll Lock, and Caps Lock
Set-Up key for pop-up set-up menu
Cylindrical and thin keytop
With click mechanizm
Not detachable
Serial (RS-232C) x 1 port (D-SUB 9 pin, maleJX>D,
nector)
Parallel (Centronics) x 1 port (D-SUB 25 pin, female
connector)
-5-
lIO slot Sharp proprietary slot x 3
- 1 slot for color/monochrome CRT adaptor
- 1 slot for modem/SIO card (for US/Canada only)
or
SID
card
The above cards are installed into the same space.
So, only one card is available at the same time.
- 1 slot for 1 MB EMS 4.0 memory card
Power Supply: Rechargeable lead battery
- low battery warning
low battery indicator
alarm
AC adaptor
EA-452V
IN local voltage
OUT DC 9V, 2.5A
Dimension 115(w) x 67(d) x 55(h) mm
Weight Approx. 425g
Volume LCD contrast volume
Backlight brightness volume
Switch Power ON/OFF button' (software switch)
4 dip switches
Dip Switch Label
Feature Initial setting
Alarm Control
1 (Low BatterylShut off Alarm) ON
ON/OFF
2
Speaker Control
ON
(without alarm) ON/OFF
3
System all reset ON/OFF OFF
4 Speaker Volume LOW/HIGH
OFF (HIGH)
Shut off alarm switch (alarm when upper cabinet is shut during power
on.)
LED indicator :
Other
Dimension
Weight
Software
Manual
Power (green); low battery (red);
PC-4702 - drive A (green); drive B (green)
PC-4721 14741 - floppy disk (green); hard disk
(green)
Caps Lock (green); Num Lock (green); Scroll Lock
(green)
Carrying handle; speaker; display lock slide-switch x
2
11 (w) x 11.1 (d) x 2_2(h) inch
280(w) x 282(d) x 58(h) mm
(high: cushion rubber on the bottom cabinet in-
cluded, without cushion rubber: 57mm)
PC-4702 - 3.6kg
PC-47?1/4741 -3_8kg
(with battery, without AC adaptor)
battery: Approx. 830g
AC adaptor (EA-452V): Approx. 425g
MS-DOS 3_30/GW-BASIC 3_22
Operation Manual (MS-DOS/GW-BASIC quick refer-
ence included)
Optional MS-DOS and GW-BASIC manuals