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Toshiba SP-S2 System ROM on a 1FZS MVS slot.

SP-S2 is the name of the 128KiB ROM containing the 68k code for the system ROM embedded in some MVS systems.

It's mapped in the 68k's address space from $C00000 to $C1FFFF, and mirrored over to $D00000.

The dump is named sp-s2.sp1 in system ROM sets.

See System ROM.