Epson ActionDesk 4000+ Specifiche tecniche - Pagina 4
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System board components and connectors
I Component
System controller (UMC82C491); integrated system, memory,
U28
and cache controller
U10
Video controIler (GD5428); local bus VGA with integrated palette
DAC, dual-frequency synthesizer, BitBLT for GUI acceleration
Line and serial controller (UMC82C865F)
U4
U13
Super I/O controller (UMC82C863); supports up to two diskette
drives, two serial ports, and one parallel pert
U35
Local bus IDE controller (Adaptec AIC-24VL01Q)
U12
Clock generator (IMI SC 425 chip); 4V to 7V operating supply
range, 1 ns skew, CMOS or TTL compatible outputs
U20-23. U29-32 Cache SRAM sockets
I U36
U7, U8, U2, U3
Video DRAM; two chips soldered at U7 and U8; two expansion
sockets at U2 and U3
Video connector: 15- Spin. D-shell
CN2
Parallel port; 25-pin, D-shell
CN3
CN5
Serial port labeled COM1; 9-pin, D-shell
Serial port labeled COM2: 9-pin. D-shell
CN4
I Mouse; 6-pin, mini-DIN
J21
Speaker connector; 4-pin header
J3, J24
Reset; P-pin header
J30
Hard disk drive; 4O-pin header
J32
Hard d&k drive. weed. and power LED connector: 6-pin header
I S1
Jumper Settings
J36
J14. J16
J37
J17
J19
J22
J25, J26,J27, J28
EPSON ActionDesk 4000+ - 4
I
I
I
I
I
J4-J11
I
J34
12/93
Jumper settings
Jumper
Jumper
number
setting Function
J4
1-2
Enables game port
2-3*
Disables game port
J5
1-2*
Assigns PARALLEL port as LPT1
Disables diskette drive controller
J9, J10, J11 12-3'
Featured
Off*
J14
Disables IRQ9 for VGA
on
Enables IRQ9 for VGA
J16***
1-2
Selects a CPU clock speed of 33 MHz (486SX/33,
486DX33, 486DX2/66, and Pentium OverDrive
processor)
3-4
Selects a CPU clock speed of 50 MHz (DX/50)
5-6
Selects a CPU clock speed of 25 MHz (4865SX/25,
486DX2/50)
o f f '
Selects fast speed
on
Selects 8 MHz speed
J34
2-3*
Selects the system board battery
3-4
Discharges CMOS memory (this resets the SETUP
values to their factory defaults)
J35
1-2.
Enables the IDE hard disk drive controller
2-3
Disables the IDE hard disk drive controller
1 - 2 . R e s e r v e d
*Factory setting
** You can use MS-DOS to automatically reassign parallel and serial ports.
Check your MS-DOS manual for more information.
***Setting depends on CPU
External cache jumper settings*
Cache size
128KB
If you have no external cache installed, the position of these jumpers does
l
not matter.
Processor type jumper settings
486DX, DX2, or Pentium OverDrive
486SX
VGA jumper settings
VGA jumper function
Enable on-board VGA
Disable on-board VGA
J27
1-2
1-2
Off
2-3
1-2
1-2
J17
J19
1-2,3-4
1-2
2-3
Off
J36
J37
on
on
Off
Off
J28
2-3
1-2