syslogic IPC/NETIPCFW-1A User Documentation page 26

IPC/NETIPCFW-1A: User Documentation
DOC/NETIPCFW-E; V3.0
INT 16h, Keyboard Services
The keyboard BIOS is called through software interrupt 16H. Services are provided to read
keystrokes from the keyboard typeahead buffer, peek at the next keystroke in the typeahead
buffer, and get the status of the shift keys on the keyboard.
Additional services are provided by the INT 16h service module to set the CPU speed and
manipulate the system's cache. These services are historically bound to the INT 16h service
because they were first managed by the 8042 keyboard controller.
INT 17h, Parallel I/O Services
The parallel BIOS is called through software interrupt 17H. Services are provided to write a
character to the parallel port, initialize the printer attached to a parallel port, and read the status
of a printer attached to a parallel port.
INT 1ah, Time Services
The date/time BIOS is called through software interrupt 1aH. Services are provided to read the
system time counter, write the system time counter, read the real time clock, write the read time
clock, read the real time clock date, and write the real time clock date.
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