case 4

1.The following IRQ remain eligible for use with a NIC are
IRQ3 = for COM2/COM4 or bus Mouses
IRQ4 = for COM1/COM2
IRQ10 = used for primary SCSI controller
IRQ11 = used for secondary SCSI controller

2.
a. For a minimun cost, i'll buy a 32 bit bus-mastering NICs with additional RAM for all segments.
b. To get the required result but only one of the optional desired results, i'll use a minimum cost for the network.
c.To get the required result but neither of the optional desired result, i'll buy a expensive hardware for the Network.
d.To get the proposed solution but does not produce the required result.

3.
b. Replace the 8 bit NE1000 with a 32-bit NE3200 EISA card because EISA is backward-compatible with ISA and you cab enjoy the extra performance boast.

4.
c. Remove all nonessential adapters and install the NIC then use whatever IRQ's are available to install as many of the other adapters as you can get working.