Fixed some WD80x3 NIC bugs and redid how the DP8390 is told how much memory to allocate and what internal memory space address to map it to.

src/network/net_3c503.c

@@ -596,6 +596,7 @@ threec503_nic_init(const device_t *info)
     dev->dp8390->priv = dev;
     dev->dp8390->interrupt = threec503_interrupt;
     dp8390_set_defaults(dev->dp8390, DP8390_FLAG_CHECK_CR | DP8390_FLAG_CLEAR_IRQ);
+    dp8390_mem_alloc(dev->dp8390, 0x2000, 0x2000);
 	
     memcpy(dev->dp8390->physaddr, dev->maclocal, sizeof(dev->maclocal));