Apple LC520 Specifications download pdf (Page 56)

CHAPTER 4

Software

44 System Software

csCode values:

High-level call:

Control(refNum: INTEGER; csCode: INTEGER; csParamPtr: Ptr) : OSErr

Status 4

PBStatus (paramBlock: ParmBlkPtr; async: BOOLEAN) : OSErr_Status

Parameter block

csCode values:

High-level call:

Status(refNum: INTEGER; csCode: INTEGER; csParamPtr: Ptr) : OSErr

Name Value Description

CtrlScrnBright $4301 Set screen brightness PWM value to

csParam[0] (value = 0-255).

CtrlSaveBright $4302 Store current brightness to PRAM.

CtrlScrnCont $4307 Set screen contrast PWM value to

csParam[0] (value = 0-255).

CtrlSaveCont $4308 Store current contrast to PRAM.

CtrlScreenOff $4309 Turn off power to internal monitor.

CtrlScreenOn $4310 Turn on power to internal monitor.

→ ioCompletion Nil.

← ioResult controlErr (–17) if csCode value is unimplemented;

otherwise, noErr (0).

→ ioRefNum Driver’s reference number.

→ csCode Identiﬁes the call; described below.

→ csParam Depends on the call; described with the csCode values

where it is used (csParam is an array of 11 shorts).

Name Value Description

StatScrnBright $5301 Return current screen brightness in

csParam[0](value = 0-255).

StatBrtMinMax $5303 Return minimum and maximum brightness values:

csParam[0] = maximum brightness,

csParam[1] = minimum brightness.

StatScrnCont $5307 Return current screen contrast in

csParam[0] (value = 0-255).

StatConMinMax $5308 Return minimum and maximum contrast values:

csParam[0] = maximum contrast,

csParam[1] = minimum contrast.

StatScrnOnOff $5309 Return state of internal monitor in

csParam[0]:

$00FF = monitor power is on,

$0000 = monitor power is off.

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Apple LC520 Specifications Page 56

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