Acrosser Technology AR-B1380, User Manual

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AR-B1380/AR-B1380A User’ s Guide
Page 11
I/O Pin Signal Name Input/Output I/O Pin Signal Name Input/Output
C1 -SBHE Input/Output D1 -MEM16 Input
C2 LA23 Input/Output D2 -IO16 Input
C3 LA22 Input/Output D3 IRQ10 Input
C4 LA21 Input/Output D4 IRQ11 Input
C5 LA20 Input/Output D5 IRQ12 Input
C6 LA19 Input/Output D6 IRQ15 Input
C7 LA18 Input/Output D7 IRQ14 Input
C8 LA17 Input/Output D8 -DACK0 Output
C9 -MRD16 Input/Output D9 DRQ0 Input
C10 -MWR16 Input/Output D10 -DACK5 Output
C11 SD8 Input/Output D11 DRQ5 Input
C12 SD9 Input/Output D12 -DACK6 Output
C13 SD10 Input/Output D13 DRQ6 Input
C14 SD11 Input/Output D14 -DACK7 Output
C15 SD12 Input/Output D15 DRQ7 Input
C16 SD13 Input/Output D16 +5V Power
C17 SD14 Input/Output D17 -MASTER Input
C18 SD15 Input/Output D18 GND Ground
Table 2-4 I/O Channel Pin Assignments
2.5 REAL-TIME CLOCK AND NON-VOLATILE RAM
The AR-B1380/AR-B1380A contains a real-time clock compartment that maintains the date and time in
addition to storing configuration information about the computer system. It contains 14 bytes of clock and
control registers and 114 bytes of general purpose RAM. Because of the use of CMOS technology, it
consumes very little power and can be maintained for long period of time using an internal Lithium battery.
The contents of each byte in the CMOS RAM are listed as follows:
Address Description
00 Seconds
01 Second alarm
02 Minutes
03 Minute alarm
04 Hours
05 Hour alarm
06 Day of week
07 Date of month
08 Month
09 Year
0A Status register A
0B Status register B
0C Status register C
0D Status register D
0E Diagnostic status byte
0F Shutdown status byte
10 Diskette drive type byte, drive A and B
11 Fixed disk type byte, drive C
12 Fixed disk type byte, drive D
13 Reserved
14 Equipment byte
15 Low base memory byte