Installation guide

7 Additional Libraries OS-9 V2.4 on EUROCOM-17
48 Software Manual
blk_disp() Enable/disable hex display
❏ Synopsis:
int blk_disp (cntrl)
int cntrl; /* 1: enables hex display (*) */
/* 0: disables hex display */
/* -1: read status only */
❏ Usage:
The blk_disp() function enables or disables the hex display at the
front panel.
If an error occurs, blk_disp() returns -1 and the appropriate error
code is placed in the global variable errno. If no error occurs,
blk_disp() returns the current status.
❏ See Also:
F$System system call
en_sem_irq() Enable/disable semaphore interrupt at $7C
❏ Synopsis:
int en_sem_irq (cntrl)
int cntrl; /* 1: enables semaphore interrupt (*) */
/* 0: disables semaphore interrupt */
/* -1: read status only */
❏ Usage:
The en_sem_irq() function enables or disables semaphore interrupts
at address $7C.
If an error occurs, en_sem_irq() returns -1 and the appropriate error
code is placed in the global variable errno. If no error occurs,
en_sem_irq() returns the current status.
❏ See Also:
F$System system call