volClik
SysParmType structure
#include <OSUtils.h>
char valid; 1 0 Validity status 0xA8=successful write
char aTalkA; 1 1 Used by AppleTalk Manager
char aTalkB; 1 2 Used by AppleTalk Manager
char config; 1 3 Bit fields tell how each port is used
short portA; 2 4 Baud rate, stop bits, etc
short portB; 2 6 Baud rate, stop bits, etc
long alarm; 4 8 Alarm setting ( seconds since
01/01/1904)
short font; 2 12 Application font number -1
short kbdPrint; 2 14 Printer connection, key delay, key rate
short volClik; 2 16 Carat blink, dble-click interval, spkr
short misc; 2 18 menu blink, startup disk, mouse scaling
flag
} SysParmType; 20
typedef SysParmType *SysPPtr;
Notes: This structure is a global variable named SysParam (at 0x01F8), which
data found in the "Parameter RAM", which is the battery-powered storage
in the CMOS clock chip. Each of the fields also has a unique name and may be
accessed individually:
The valid field (SPValid, at 0x01F8) gets tested at system startup. If the
parameter RAM was read or written correctly, this field gets set to 0xA8.
The aTalkA and aTalkB fields (SPATalkA at 0x01F9 and SPATalkB at
0x01FA) identify whether a port is in use and how:
The config field (SPConfig, at 0x01FB) indicates how the ports are
currently configured. The high nibble (4 bits) is for Port A and the low
nibble is for port B. one of the usage codes 0 (free), 1 (AppleTalk), or 2
( serial) is in each nibble.
The portA and portB fields (SPPortA at 0x01FC and SPPortB at 0x01FE)
identify the current serial protocol in use for the ports. The 16-bit value
is formatted as:
The alarm field (SPAlarm, at 0x0200) is the time (in seconds since
1/1/1904) at which an alarm interrupt will occur. This is used by the
Clock DA.
The font field (SPFont, at 0x0204) is one less than the font number of the
current application font (used when you identify font number 1 in calls like
TextFont).
The kbdPrint field (SPKbd at 0x0206 and SPPrint at 0x0207) contain
keyboard and printer information as follows:
The volClik field (SPVolCtl at 0x0208 and SPClikCaret at 0x0209)
contains speaker volume setting, the standard double-click sensing time,
and the menu-blink count as follows:
The misc field (SPMisc2 byte at 0x02B) contains the menu blink interval,
preferred system startup disk, and mouse-motion scaling flag, as follows:
