Dma Assignments; Hardware Interrupts - Epson ActionNote 4000 Product Information

DMA Assignments

Level Assigned Device
DMA0 Available
DMA1 Available
DMA2 FDD controller (8-bit)
DMA3 Available
DMA4 Cascade for CTRL 1
Available
DMA5
DMA6 Available
Available
DMA7

Hardware Interrupts

Function
IRQ No.
IRQ0 System timer
IRQ1 Keyboard
IRQ2 cascade
IRQ3 COM2 (trackball)
IRQ5 Available
FDD controller
IRQ6
IRQ7 Parallel port LPT1
IRQ8 Clock/calendar
IRQ9 VGA
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
000-020
020-040
040-060 Timer/counter
060-070 Keyboard controller
070-080 Real-time clock NM1 (non-maskable interrupt mask)
080-0A0 DMA page register
0A0-0C0
0C0-0F0
Hard Disk Drive Types
* Actual size when formatted may be slightly different than the size listed on the
drive label.
** Epson hard disk drive
Programmable Timer/Counters
Power-On Diagnostics and Boot Errors
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.
Power-on Diagnostics Error Messages
Error No.
Message
CMOS Battery Has
1
Failed
2 CMOS Checksum Error
3
4
7/27/93
EPSON ActionNote 4000
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.
ActionNote 4000-7