Epson Equity LT User manual

EQUITY LT
Switch Settings
Computer Specifications
I
The CPU SPEED switch selects between 4.77 MHz and 10
MHz. When the computer is running at 4.77 MHz, the power
light is orange, and at 10 MHz, the light is green.
CPU: NEC V30 dual-speed
m1croprocess0r.
4.77 or 10 MHz Switch selectable
clock speeds. 20-b,, address bus and
16.blf data bus
640KB on man system board
16KB. ,n two sockets
RAM:
ROM:
Floppy Disk
Controller:
The CPU SPEED switch is located above the keyboard.
Supports two tnfernal 35 (720KB)
dwes and one external 5 25” (360KB)
drive
Two expansron slots (proprietary)
Internal. programmable
64 Bytes of CMOS RAM lor real-llme
clock. calendar, and system
cont,gurat,on w,th battery backup
P,op,,e,ary, full-functmn. 65 keys,
separate numer~clcursor pad
N,Cad rechargeable battery and
siandard 1101220 AC adaptor
Expansion Slots:
Speaker:
Clock/Calendar
RAM:
Num
Lock
Keyboard:
Power:
Video Controller
and Screen:
Superlwf or super,wsl backlit LCD,
external CGA momtor port opflonal
Mass storage:
Standard:
Two. 3.5 half-height floppy disk
dwes. 720KB storage capacity
35- half-helgh, floppy disk dwe and
20MB hard disk drive
Centronlcs’-compatible parallel port
RS-232C compattble serial port
5 25 floppy disk dwe port
Exlernal CGA port
LCD DIP Switch Settings
Standard:
Switches Functions
Interfaces:
Standard:
Standard:
Standard:
Standard:
1 2 3 4
ON
OFF
ON ON
ON OFF
OFF ON
OFF OFF
ON
OFF
Environmental
Conditions:
Temperature
LCD Normal
LCD Reverse
LCD Screen Mode 0
LCD Screen Mode 1
LCD Screen Mode 2
LCD Screen Mode 3
Select LCD
Select RGB color monitor
Operating Range 41~ to 90°F
(50 to 35%)
Storage Range -4O to 12Z°F
(-20” lo 6OOC)
Operating Range 20% 10 60%
non-condensing
storage Range 10% to 90%
non-condensmg
Humidity:
Physical
Dimensions: Wldlh -13 6 I”
Depth -12 2 I”
Height- 3 1 I”
Waghi- 12 6 Ibs
(Dual floppy disk drive conhguratlon)
J
Display Options: Supertwist
Backlit LCD
Screen Type: Rellectlve Transmlsslve
LCD Color: YdOW
Blue
Size (Active Area): 95 x 4 1 95’ x41
Aspect Ratio:
14to1 14101
Graphrcs
Resolution: 640 x 200 640 Y 200
80 x25 60 x 25
Character
Drsplav:
S&&able View
Anglellnverse
Video: Y=?S
Yes
Adjustable
Brightness:
Power Saver
Feature:
NO Yes
NO Yes
Equity LT Options: Internal 30011200 baud modem
13 CGAcolordlsplay(640 x 200dots)
carrying case
Cigarette lighter adaptor
Screen d,splays
Supertwsl LCD dnsplay
Supertwsl Backltt LCD display
Equity Series Computers
EQLT - 1
12/12/88

EQUITY LT
Back Panel DIP Switch Settings
Switches Functions
12 3 4
3N
Use external diskette drive
3FF
Use parallel printer
ON
External diskette drive is B
OFF
External diskette drive is A
ON 1 FDD
OFF 2
FDDs
ON
Serial port is secondary
OFF
Serial port is primary
System Board Jumper Adjustment
Jumper 5 is used to control the LED showing drive access
for the left-hand drive. In position A, it supports a FDD.
In position B, it supports a HDD.
Connector Pin Assignments
Parallel Port Connector
13
000000000000cJ
25
oooooooooooc
PIN NO. SIGNAL NAME DIRECTION
1 -STROBE 0
: DATA0
ii
DATA1
4 DATA2 0
5 DATA3 0
6 DATA4
7 DATA5
i
8 DATA6 0
9 DATA7 0
10
-ACK I
11 BUSY I
12
I
13
ZCT I
14 -AUTOFD I
15
-ERROR I
16
-1NIT I
17 -SLCTIN
I
18-25 GND
DESCRIPTION
Strobe
Printer Data 0
Printer Data 1
Printer Data 2
Printer Data 3
Printer Data 4
Printer Data 5
Printer Data 6
Printer Data 7
Acknowledge
Printer Busy
Paper End
Printer Select
Auto Feed
Printer Error
Printer Initialize
Printer Select
Ground
Serial Port Connector
PIN NO. SIGNAL NAME DIRECTION DESCRIPTION
1
CRDET I
Data Carrier Detect
:
RXDT
I
Receive Data
TXDT
Transmit Data
4 DTR i
Data Terminal Ready
z
SG
Signal Ground
DSR
Data Set Ready
L
RTS :,
Request to send
CTS
I
Clear to Send
9
RI I
Ring Indicator
Monitor Connector
PIN NO. SIGNAL NAME DIRECTION DESCRIPTION
ROUT
GOUT
BOUT
IOUT
NC
HSYNC
VSYNC
Frame Ground
Ground
Video Signal (Red)
Video Signal (Green)
Video Signal (Blue)
Video Signal (Intensity)
No connection
Horizontal Sync.
Vertical Sync.
EQLT - 2
12/12/88 Equity Series Computers

EQUITY LT
I/O Port Addresses
Address Function
000-OlF
DMA Controller
020 - 03F Interrupt Controller
040 -05F Timer / Counter
080 - 07F Programmable Peripheral Interface
080 - 09F
DMA Page Register
OAO
Non - Maskable Interrupt Mask
2F8-2FF Serial Port 2
320 - 32F
Hard Disk Controller
3BC - 3BF Parallel Port
3D0 - 3DF Video (LCD/CRT) Controller
3FO-3W
Floppy Disk Controller
3F8 -3FF Serial Port 1
03DA
Gradation Selection
1184-1185
RTC and CMOS RAM
1188 System Status Register
DMA Channels
Channel Function
0DRAM Refresh
1 Spare
2
FDD Controller
3
HDD Controller
Hardware Interrupts
NUMBER FUNCTION
IRQO
IRQl
IRQ2
IRQ3
IRQ4
IRQ5
IRQ8
IRQ7
Timer Output
Keyboard
Reserved
Serial Port 2
Serial Port 1
Hard Disk
Floppy Disk
Printer
Equity Series Computers 12/12/88 EQLT-3

EQUITY LT
lnstallation/Support Tips
Power
--- The Equity LT AC adapter is an auto -sensing unit
which adjusts automatically between 100-240 V,
50/60 Hz. Therefore, it can be used anywhere in
the world without special adjustment.
--- When using the Equity LT, equipped with the HDD
and backlit LCD, on battery power, take
conservation measures. These are: 1) set the
backlight period option to 30 seconds, 2) set the
brightness and contrast controls as low as is
comfortable, 3) run at 4.77 MHz and 4) turn the
HDD off, at the power switch in the rear of the
drive, when the HDD is not actually in use.
--- Periodically, discharge the battery completely. This
will help to minimize the memory effect encountered
with NiCad batteries. After the complete discharge,
give the LT a full, 12-hour recharge. This will
help to keep battery charge life as great as
possible.
Video
--- When using the Equity LT with a color monitor, as
opposed to an LCD, make sure that LCD DIP switch
number 4 is set OFF. If the unit is connected to
both LCD and monitor, the display can be switched
back and forth without rebooting.
--- If you find the display, generated by your software
package, is difficult to read, adjust LCD DIP
switches 2 and 3 to find the clearest LCD Mode.
There are four options and one of them should
improve the display.
--- If your software requires that you specify a display
type, select CGA. If it is an option, select CGA -
ONE COLOR. Some software packages have a
display type called BLACK & WHITE for Laptops. If
this is an available option, select it.
EQLT - 4
12/12/88
Software Problems
--- When installing a copy- protected software package
on the Equity LT, set the the CPU speed to 4.77
MHz. This has been found to have fewer conflicts
with copy-protection. After the installation, the
CPU can be switched back to the higher speed.
--- If a software package does not appear to be
compatible with the Equity LT, try switching the
CPU speed to 4.77 MHz before giving up. Some
software packages (e.g., PC-Talk Ill from Headlands
Communications Corp.) have been found to function
only at 4.77 MHz.
Equity Series Computers

EQUITY LT
Information Reference List
Engineering Change Notices
EQLT-001
EQLT-002
EQLT-003
12/8/87
2/10/89
Change of Cable Set Y6DE (PDD Signal Cable)
Hilo-HDC Snort Potential
Equity LT/LT Modem Insulating Sheet
Product Support Bulletins
50031
12/14/87
w5/~
6/14/M
W89
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Equity LT -Common Questions and Answers
Equity LT Battery Life
Equity Series Computers - ROM History
Equity LT S&ware Package. MSDOS 3.2 and GW-Basic
Equity LT Software Package
MSDOS 3.3 Upgrade
Equity LT Technical Manual
Equity LT Programmer’s Reference Manual
Equity LT Pans List
Equity LT LCD (Back Lit) Parts List
Equity LT LCD (Supertwist) Parts List
Equity LT User’s Guide and Diagnostics Manual
Equity Series Computers 9/22/89 EQLT-5
Technical Information Bulletins
EQLT-OfIl
l/31 189
Equity LT/LT Modem
EQSEMO4 6/12/i%
Keyboard Alignment