Epson 4DX2/50 User Manual
EPSON Equity 4SX/25,4DX/33, and 4DX2/50
VGA Feature Connector (CN8)
pin 1
pin 25
pin 2
pin 26
VGA Feature Connector Pin Assignments
8
Not connected
9
PCLK
*Active low
DMA Assignments
Assigned device
DMAO
Spare
Spare
Spare
DMA2
FDD controller
DMA3
Spare (&bit)
Spare
Spare
Spare
Spare
DMA7
Spare
Hardware Interrupts
no.
iRQ3
Function
Timer output
Keyboard
Serial port 2
System I/O Address Map
Hex address
040
070
(CMOS)
OAO OBF
OCO ODF
OF0
OF1
OF8 OFF
OCO ODF
OF0
OF1
OF8 OFF
200 207
278 27F
278 27F
2DF
and
2FF
378 37F
3A0 3AF
3BF
DCA 3278
PC network
Parallel printer
Parallel printer
1
SDLC, bisync 2
Cluster
Cluster
Bisynchronous 1
Monochrome display and printer adapter
Enhanced graphics adapter
Monochrome display and printer adapter
Enhanced graphics adapter
Assigned device
DMA controller
DMA controller
interrupt controller
master
Timer, 8254-2
8042 (Keyboard and mouse)
8042 (Keyboard and mouse)
Real-time
(non-maskable interrupt mask)
DMA page register,
interrupt controller 2, 8259A
DMA controller
Clear math coprocessor busy
Clear math coprocessor busy
Reset math coprocessor
Math coprocessor
Hard disk
Game
Parallel printer port 2
Alternate enhanced graphics adapter
Hard disk
Game
Parallel printer port 2
Alternate enhanced graphics adapter
(adapter 0)
Data acquisition (adapter 0)
Serial port 2
Prototype card
Serial port 2
Prototype card
EE2 EE3
iRQ13
iRQ14
iRQ14
Math coprocessor
HDD controller
Avaiiabie
HDD controller
Avaiiabie
4/1/93
EPSON Equity-5