AMX 86 ajivtx ajivtx

AMX 86 Procedures

DAK

247

ajivtx ajivtx

Purpose Exchange an Interrupt Vector

Used by n Task n IS P n Timer Procedure n Restart Procedure n Exit Procedure

Setup int inttype;

void (*oldproc)();

void newproc();

int status;

status = ajivtx(inttype, newproc, &oldproc);

AX DX ES:BX DS:DI

Where inttype is the 8086 interrupt type (0-255).

newproc is a pointer to the new interrupt handler.

&oldproc is a pointer to storage for the pointer to the current interrupt

handler.

Results Interrupts are disabled and then restored to their state at the time of the

call.

Status is returned.

AEROK = Call successful

AERIPR = Vector table is not accessible

AMX was launched with access to the Interrupt Vector

Table denied.

Note oldproc can be used as newproc in a subsequent call to ajivtx.

status = ajivtx(inttype, oldproc, &oldproc);

Restrictions You must NOT use this procedure to alter the vector entries for the divide

error, overflow trap or bounds error. Use ajitrp for that purpose.