Apple PowerBook 520 Technical Information download pdf (Page 122)

CHAPTER 6

Power Manager Interface

108 About the Power Manager Interface

ASSEMBLY-LANGUAGE INFORMATION

The trap is _PowerMgrDispatch ($A09E). The selector value for AutoSleepControl

is 13 ($0D) in the low word of register D0. The Boolean value is passed in the high word

of register D0.

GetIntModemInfo 6

You can use the GetIntModemInfo routine to ﬁnd out information about the

internal modem.

unsigned long GetIntModemInfo();

DESCRIPTION

The GetIntModemInfo routine returns a 32-bit ﬁeld containing information that

describes the features and state of the internal modem. It can be called whether or not a

modem is installed and will return the correct information.

If a bit is set, that feature or state is supported or selected; if the bit is cleared, that feature

is not supported or selected. Undeﬁned bits are reserved by Apple for future expansion.

Field descriptions

Bit

Bit name number Description

hasInternalModem 0 An internal modem is installed.

intModemRingDetect 1 The modem has detected a ring on the telephone line.

intModemOffHook 2 The internal modem has taken the telephone line off

hook (that is, you can hear the dial tone or modem

carrier).

intModemRingWakeEnb 3 The computer will come out of sleep mode if the

modem detects a ring on the telephone line and the

computer supports this feature (see the

canWakeupOnRing bit in PMFeatures).

extModemSelected 4 The external modem is selected (if this bit is set, then

the modem port will be connected to port A of the

SCC; if the modem port is not shared by the internal

modem and the SCC, then this bit can be ignored).

Bits 15–31 contain the modem type, which will take on one of the following values:

–1 Modem is installed but type not recognized.

0 No modem is installed.

1 Modem is a serial modem.

2 Modem is a PowerBook Duo–style Express Modem.

3 Modem is a PowerBook 160/180–style Express Modem.

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Apple PowerBook 520 Technical Information Page 122