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Yes, it is documented in the ROM Kernel Manuals:
The Preferences structure in 1.3 and earlier versions of the OS is a static 232 byte data structure defined in <intuition/preferences.h> as follows:
struct Preferences
{
/* the default font height */
BYTE FontHeight; /* height for system default font */
/* constant describing what’s hooked up to the port */
UBYTE PrinterPort; /* printer port connection */
/* the baud rate of the port */
UWORD BaudRate; /* baud rate for the serial port */
/* various timing rates */
struct timeval KeyRptSpeed; /* repeat speed for keyboard */
struct timeval KeyRptDelay; /* Delay before keys repeat */
struct timeval DoubleClick; /* Interval allowed between clicks */
/* Intuition Pointer data */
UWORD PointerMatrix[POINTERSIZE]; /* Definition of pointer sprite */
BYTE XOffset; /* X-Offset for active ’bit’ */
BYTE YOffset; /* Y-Offset for active ’bit’ */
UWORD color17; /***********************************/
UWORD color18; /* Colours for sprite pointer */
UWORD color19; /***********************************/
UWORD PointerTicks; /* Sensitivity of the pointer */
/* Workbench Screen colors */
UWORD color0; /***********************************/
UWORD color1; /* Standard default colours */
UWORD color2; /* Used in the Workbench */
UWORD color3; /***********************************/
/* positioning data for the Intuition View */
BYTE ViewXOffset; /* Offset for top lefthand corner */
BYTE ViewYOffset; /* X and Y dimensions */
WORD ViewInitX, ViewInitY; /* View initial offset values */
BOOL EnableCLI; /* CLI availability switch (OBSOLETE)*/
/* printer configurations */
UWORD PrinterType; /* printer type */
UBYTE PrinterFilename[FILENAME_SIZE]; /* file for printer */
/* print format and quality configurations */
UWORD PrintPitch; /* print pitch */
UWORD PrintQuality; /* print quality */
UWORD PrintSpacing; /* number of lines per inch */
UWORD PrintLeftMargin; /* left margin in characters */
UWORD PrintRightMargin; /* right margin in characters */
UWORD PrintImage; /* positive or negative */
UWORD PrintAspect; /* horizontal or vertical */
UWORD PrintShade; /* b&w, half-tone, or color */
WORD PrintThreshold; /* darkness ctrl for b/w dumps */
/* print paper descriptors */
UWORD PaperSize; /* paper size */
UWORD PaperLength; /* paper length in number of lines */
UWORD PaperType; /* continuous or single sheet */
/* Serial device settings: These are 6 nibble-fields in 3 bytes */
/* (these look a little strange so the defaults will map out to 0) */
UBYTE SerRWBits; /* upper nibble = (8-number of read bits) */
/* lower nibble = (8-number of write bits) */
UBYTE SerStopBuf; /* upper nibble = (number of stop bits - 1) */
/* lower nibble = (table value for BufSize) */
UBYTE SerParShk; /* upper nibble = (value for Parity setting) */
/* lower nibble = (value for Handshake mode) */
UBYTE LaceWB; /* if workbench is to be interlaced */
Preferences 333
UBYTE WorkName[FILENAME_SIZE]; /* temp file for printer */
BYTE RowSizeChange; /* affect NormalDisplayRows/Columns */
BYTE ColumnSizeChange;
UWORD PrintFlags; /* user preference flags */
UWORD PrintMaxWidth; /* max width of printed picture in 10ths/in */
UWORD PrintMaxHeight;/* max height of printed picture in 10ths/in */
UBYTE PrintDensity; /* print density */
UBYTE PrintXOffset; /* offset of printed picture in 10ths/inch */
UWORD wb_Width; /* override default workbench width */
UWORD wb_Height; /* override default workbench height */
UBYTE wb_Depth; /* override default workbench depth */
UBYTE ext_size; /* extension information -- do not touch! */
/* extension size in blocks of 64 bytes */ };
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