diff --git a/src/mame/machine/archimds.c b/src/mame/machine/archimds.c
index 53edd5e4f18..705abc5abfe 100644
--- a/src/mame/machine/archimds.c
+++ b/src/mame/machine/archimds.c
@@ -688,7 +688,6 @@ READ32_MEMBER(archimedes_state::archimedes_ioc_r)
 					if (m_fdc)
 					{
 						//printf("17XX: R @ addr %x mask %08x\n", offset*4, mem_mask);
-
 						switch(ioc_addr & 0xc)
 						{
 							case 0x00: return m_fdc->status_r();
@@ -805,17 +804,17 @@ WRITE32_MEMBER(archimedes_state::archimedes_ioc_w)
 							case 0x40: // latch A
 								floppy_image_device *floppy = NULL;
 
-								if (data & 1) { floppy = m_floppy0->get_device(); }
-								if (data & 2) { floppy = m_floppy1->get_device(); }
-								if (data & 4) { floppy = NULL; } // floppy 2
-								if (data & 8) { floppy = NULL; } // floppy 3
+								if (!(data & 1)) { floppy = m_floppy0->get_device(); }
+								if (!(data & 2)) { floppy = m_floppy1->get_device(); }
+								if (!(data & 4)) { floppy = NULL; } // floppy 2
+								if (!(data & 8)) { floppy = NULL; } // floppy 3
 
 								m_fdc->set_floppy(floppy);
 
 								if(floppy)
 								{
 									floppy->mon_w(BIT(data, 5));
-									floppy->ss_w(BIT(data, 4));
+									floppy->ss_w(!(BIT(data, 4)));
 								}
 								//bit 5 is motor on
 								return;
diff --git a/src/mess/drivers/a310.c b/src/mess/drivers/a310.c
index 2ea56117cdc..efe67064522 100644
--- a/src/mess/drivers/a310.c
+++ b/src/mess/drivers/a310.c
@@ -98,6 +98,7 @@ protected:
 
 WRITE_LINE_MEMBER(a310_state::a310_wd177x_intrq_w)
 {
+	printf("%d IRQ\n",state);
 	if (state)
 		archimedes_request_fiq(ARCHIMEDES_FIQ_FLOPPY);
 	else
@@ -106,6 +107,7 @@ WRITE_LINE_MEMBER(a310_state::a310_wd177x_intrq_w)
 
 WRITE_LINE_MEMBER(a310_state::a310_wd177x_drq_w)
 {
+	printf("%d DRQ\n",state);
 	if (state)
 		archimedes_request_fiq(ARCHIMEDES_FIQ_FLOPPY_DRQ);
 	else
@@ -359,7 +361,7 @@ static MACHINE_CONFIG_START( a310, a310_state )
 	MCFG_RAM_DEFAULT_SIZE("2M")
 	MCFG_RAM_EXTRA_OPTIONS("512K, 1M, 4M, 8M, 16M")
 
-	MCFG_WD1772x_ADD("fdc", 8000000 / 2)
+	MCFG_WD1772x_ADD("fdc", 8000000 / 1) // TODO: frequency
 	MCFG_WD_FDC_INTRQ_CALLBACK(WRITELINE( a310_state, a310_wd177x_intrq_w))
 	MCFG_WD_FDC_DRQ_CALLBACK(WRITELINE(a310_state, a310_wd177x_drq_w))
 	MCFG_FLOPPY_DRIVE_ADD("fdc:0", a310_floppies, "35dd", a310_state::floppy_formats)