/lib/firmware/cis/src/RS-COM-2P.cis is in linux-firmware 1.79.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Replacement CIS for dual-serial-port IO card
#
vers_1 4.1, "PCMCIA", "RS-COM 2P"
funcid serial_port [post]
config base 0x0100 mask 0x0001 last_index 0x03
cftable_entry 0x01 [default]
[mwait]
io 0x03e8-0x03ef, 0x02e8-0x02ef [lines=10] [8bit] [range]
irq mask 0x9eb8 [level]
cftable_entry 0x02
io 0x0250-0x0257, 0x0258-0x025f [lines=10] [8bit] [range]
cftable_entry 0x03
io 0x0260-0x0267, 0x0268-0x026f [lines=10] [8bit] [range]
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