EPSON ActionNote 4000
DMA Assignments
Hard Disk Drive Types
Level
Assigned Device
DMA0
Available
DMA1
Available
DMA2
FDD controller (8-bit)
DMA3
DMA4
Available
Cascade for CTRL 1
DMA5
Available
*
Actual size when formatted may be slightly different than the size listed on the
drive label.
DMA6
Available
DMA7
Available
**
Epson hard disk drive
Hardware Interrupts
Programmable Timer/Counters
IRQ No.
IRQ0
IRQ1
Function
System timer
Keyboard
IRQ2
cascade
IRQ3
COM2 (trackball)
IRQ5
IRQ6
Available
FDD controller
Power-On Diagnostics and Boot Errors
IRQ7
IRQ8
IRQ9
Parallel port LPT1
Clock/calendar
VGA
The computer’s ROM BIOS contains a series of diagnostic
programs, called the Power-On Diagnostics (POD) or
Power-On Self Test (POST). These programs check internal
devices, such as ROM, RAM, the timer, the keyboard
controller, and the hard disk drive, every time you turn on or
reset the computer.
When the POD tests detect an error, the computer displays a
message on the screen. (If the error occurs before the
computer initializes the video display, the computer beeps.)
If the error is serious, the computer cancels further checking
and stops system initialization. The computer locks up, and if
displayed, the error message remains on the screen.
The table below lists the error messages that may appear. The
solutions provided must be followed in order. If more than
one replacement module is specified, replace them in order,
one at a time.
IRQ10 Available
IRQ11 Available
IRQ12
PS/2 compatible mouse
IRQ13
Resewed for numeric coprocessor
IRQ14
HDD controller
IRQ15
Available
System l/O Address Map
Hex Address
I
Assigned Device
000-020
1
DMA controller 1
020-040
I
Interrupt controller
040-060
060-070
070-080
080-0A0
Timer/counter
Keyboard controller
Real-time clock NM1 (non-maskable interrupt mask)
DMA page register
0A0-0C0
0C0-0F0
I
Interrupt controller 2
I
DMA controller 2
Power-on Diagnostics Error Messages
Explanation
Battery in DS 1287 or compatible
RTC that supports CMOS is low.
Replace DS 1287 or compatible RTC.
Checksum of CMOS is incorrect.
This can indicate that CMOS is
corrupted; it may be caused by a
weak battery. Check battery and
replace DS 1287 or compatible RTC
if necessary.
Interrupt channel #2 failed POD
routine.
Battery in DS 1287 or compattible
RTC that supports CMOS is low.
Replace DS 1287 or compatible RTC.
Error No.
1
Message
CMOS Battery Has
Failed
2
CMOS Checksum Error
3
4
7/27/93
ActionNote 4000-7
