FDC: Disable DSR reset on the PS/1-2011/2121 / PS/2-30 FDC.

src/floppy/fdc.c

@@ -780,6 +780,7 @@ fdc_write(uint16_t addr, uint8_t val, void *priv)
             }
             return;
         case 4:
+            if (!(fdc->flags & FDC_FLAG_PS1)) {
                 if (!(val & 0x80)) {
                     timer_set_delay_u64(&fdc->timer, 8 * TIMER_USEC);
                     fdc->interrupt = -6;
@@ -800,6 +801,7 @@ fdc_write(uint16_t addr, uint8_t val, void *priv)
                         fdc_ctrl_reset(fdc);
                     }
                 }
+            }
             fdc->dsr = val;
             return;
         case 5: /*Command register*/