SECTION 6
Conversions and Interfaces
PEN*KEY
R
6100 Computer Programmer’s Reference Guide 6-13
APM CPU Idle Interrupt
CPU Idle, INT 15h, AX=5305h, is an APM BIOS function. Refer to the CPU Idle
definition, on page 6Ć78, for details on usage.
A call to this function causes the processor to halt (via the HLT instruction) until
the next hardware interrupt. This causes good power savings, if it is used during
input polling loops, or other low activity points in an application.
Refer to the Intel APM BIOS Interface specification 1.1 or Ralf Brown's Interrupt
List for more information.
Refer to
Appendix B, Common PEN*KEY 6000 Series Information,
for a sample
listing (IDLE.CPP) showing the use of the CPU Idle interrupt.
6100 BIOS Interfaces
Overview
This is the core BIOS supported for the 6100 Computer. Starting with flash verĆ
sion 1.11, the following features are added to the core BIOS:
"
Suspend/resume coordination (suspend/resume key mapped to I/O key, if
IO2SUS.COM is loaded):
"
to work with NORAND Card and Socket services
"
and for radio integration
"
COM4 timeout for the BIOS data area
The detailed definitions for the PC BIOS interfaces supported for the 6100 ComĆ
puter are described in the paragraph. The following paragraphs summarize the
supported interrupts, as well as the unsupported interrupts.
Only some of the 4000 Series BIOS interrupts are supported by the 6100 ComĆ
puter, as described in the following paragraphs:
Supported BIOS Interfaces
There are two indexes provided for the details of the BIOS interface functions
supported for the 6100 Computer. To find an interrupt by its name, refer to the
Interrupt Index,
at the end of this publication. To locate an interrupt by the inĆ
terrupt number, refer to the
Interrupt CrossĆReference
table, on page 6Ć28.
System Timer Interface: Interrupt 08h
The system provides a periodic system timer tick and issues interrupt 8 at every
timer tick. The interrupt occurs approximately every 55 milliseconds. This rate
is close to 65535 ticks per hour.
The interrupt service routine maintains the count of interrupts from powerĆon at
BIOS data location 0x40:0x6C. After 24 hours of operation, location 0x40:0x7C
is nonzero when the counter overflows to the next day. The number of ticks in 24
hours is 0x1800B0.
The system timer interrupt issues a call to a userĆsupplied routine through interĆ
rupt 0x1C at every interrupt.
Application programs should avoid using the Timer Tick as much as possible,
since many applications are already hooked into it and it could become overĆ
loaded.
6. Conversions and
Interfaces
Содержание PEN*KEY 6100
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