Index: uspace/drv/bus/isa/isa.c
===================================================================
--- uspace/drv/bus/isa/isa.c	(revision f44ba92cca7ecb486c01e44a35828c764b333a15)
+++ uspace/drv/bus/isa/isa.c	(revision 65ceb4b0b11afe7b38fe481dece020ddf973cfe3)
@@ -51,4 +51,8 @@
 #include <dirent.h>
 #include <fcntl.h>
+#include <ipc/irc.h>
+#include <ipc/services.h>
+#include <sysinfo.h>
+#include <ns.h>
 #include <sys/stat.h>
 
@@ -96,7 +100,43 @@
 static bool isa_enable_fun_interrupt(ddf_fun_t *fnode)
 {
-	/* TODO */
-
-	return false;
+	/* This is an old ugly way, copied from pci driver */
+	assert(fnode);
+	isa_fun_t *isa_fun = fnode->driver_data;
+
+	sysarg_t apic;
+	sysarg_t i8259;
+
+	async_sess_t *irc_sess = NULL;
+
+	if (((sysinfo_get_value("apic", &apic) == EOK) && (apic))
+	    || ((sysinfo_get_value("i8259", &i8259) == EOK) && (i8259))) {
+		irc_sess = service_connect_blocking(EXCHANGE_SERIALIZE,
+		    SERVICE_IRC, 0, 0);
+	}
+
+	if (!irc_sess)
+		return false;
+
+	assert(isa_fun);
+	const hw_resource_list_t *res = &isa_fun->hw_resources;
+	assert(res);
+	for (size_t i = 0; i < res->count; ++i) {
+		if (res->resources[i].type == INTERRUPT) {
+			const int irq = res->resources[i].res.interrupt.irq;
+
+			async_exch_t *exch = async_exchange_begin(irc_sess);
+			const int rc =
+			    async_req_1_0(exch, IRC_ENABLE_INTERRUPT, irq);
+			async_exchange_end(exch);
+
+			if (rc != EOK) {
+				async_hangup(irc_sess);
+				return false;
+			}
+		}
+	}
+
+	async_hangup(irc_sess);
+	return true;
 }