Hardware Manual - RTD Embedded Technologies, Inc.

void interrupt ISR(void)
{
/* Your code goes here. Do not use any DOS functions! */
outportb(BaseAddress + 23, 0); /* Clear DM5604 interrupt */
outportb(0x20, 0x20); /* Send EOI command to 8259 */
}
Procedure ISR; Interrupt;
begin
{ Your code goes here. Do not use any DOS functions! }
Port[BaseAddress + 23] := 0; { Clear DM5604 interrupt }
Port[$20] := $20; { Send EOI command to 8259 }
end;