Specifications

Epson EL 3S/33
System l/O Address Map
Hex address
j Assigned device
000-01F I DMA controller 1,8237A-5
020-03F
interrupt controller 1,8259A, master
022-023
Chip set configuration register
040-05F
Timer, 8254-2
060-06F
8042 (Keyboard)
070 - 07F (CMOS) Real-time dock NMI (non-maskable interrupt) mask
080-09F
0A0 - 0BF
0C0-0DF
page register, 74LS612
interrupt controller 2,8259A
DMA controller 2,8237A-5
2F8 - 2FF
300-31F
360-36F
378 - 37F
380-38F
Serial port 2
Prototype card
Reserved
Parallel printer port 1
SDLC, bisync 2
Jumper Settings
Port Jumper Settings
l Factory setting
** DOS automatically reassigns parallel and serial ports. Check your DOS
manual for more information.
Drive Assignment Jumper Settings
Drive assignment
Upper drive is A
Lower drive is A
J17 J18 J19 J20
2-3 2-3 2-3 2-3
1-2* 1-2* 1-2* 1-2*
l Factory setting
Diskette Drive Controller Jumper Settings
Jumper number
J27
* Factory setting
Jumper setting Function
1-2*
Enables diskette drive controller
2-3
Disables diskette drive controller
Hard Disk Drive Controller Jumper Settings
Hard disk controller
J25
Enable
1-2*
Disable
2-3
* Factory setting
** Two-pin jumper
J22**
On*
off
Display Adapter Jumper Settings
Jumper number Jumper setting Function
J11 1-2* Color VGA display adapter
2-3 Monochrome display adapter
J15** On Interlaced mode
Off** Non-interlaced mode
* Factory setting
* Two-pin jumper
Built-in VGA Jumper Settings
Built-in VGA
J36** J37**
Enable On’ On’
Disable
off off
l Factory setting
** Two-pin jumper
To use an external display adapter in an expansion slot, you
must disable the built-in VGA adapter.
5/28/93
Epson EL 3S/33-5