Reverted floppy disk operation to what it was in build 274, with a slight cleanup;

Sound Blaster 16 and AWE32 IRQ, base address, and DMA configuration is back;
The Intel Advanced/ATX now requires version 1.00.06 of the BIOS rather than 1.00.05.

src/sound_sb_dsp.c

@@ -609,7 +609,7 @@ void sb_dsp_init(sb_dsp_t *dsp, int type)
 {
         dsp->sb_type = type;
         
-        dsp->sb_irqnum = 7;
+        dsp->sb_irqnum = 5;
         dsp->sb_8_dmanum = 1;
         
         sb_doreset(dsp);