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Although the kernel imposes an upper limit of 24 on the number of dumb serial devices that it can support, you can configure a maximum of 16 serial ports on ISA and EISA bus machines, and a maximum of 17 serial ports on MCA machines using SCO OpenServer-supported serial cards. You can configure up to 6 PCI serial boards, each with a maximum of 16 serial ports.
The device numbering scheme for dumb single and multiport ISA serial cards also limits the number of ways that you can combine the supported dumb serial cards. ``Possible combinations of ISA and EISA serial cards'' shows the possible ways of combining SCO OpenServer-supported single and multiport serial cards assuming that their base I/O addresses do not clash.
Possible combinations of ISA and EISA serial cards
| COM1 | COM2 | COM3 | COM4 |
|---|---|---|---|
| 1, 2, 4, 5 or 8 ports | - | - | - |
| 1, 2, 4, 5 or 8 ports | 1, 2, 4, 5 or 8 ports | - | - |
| 1, 2 or 4 ports | 1, 2 or 4 ports | 1 or 4 ports | - |
| 1, 2, 4, 5 or 8 ports | 1, 2 or 4 ports | - | 1 or 4 ports |
| 1, 2 or 4 ports | 1, 2 or 4 ports | 1 or 4 ports | 1 or 4 ports |