This is a simple CLI tool I wrote for splitting (interlace), merging (deinterlace) and slicing (cutting in half, if one and the same BIOS ROM-dump file is concatenated) of those old BIOS ROM dump files. It's self explanatory (no need for readme.txt, help.txt, etc.) and may be handy to someone else.

The tool can split (interlace) ROM-dump files if their size is 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576, 2097152 or 4194304 bytes (4 kbit up to 32 Mbit). It also can merge (deinterlace) "low" and "high" ROM-dump files it their size is 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576 or 2097152 bytes in size (2 kbit up to 16 Mbit). The tool checks if generated files already exists, if files are already opened and for file naming redundancies.

UPDATE: In the latest version 1.5 I added an option /C to slice (cut) in half those ROM-dump files (4 kbit up to 32 Mbit in size) created by concatenation of one and the same BIOS ROM-dump file. Mind that this operation checks every pair of read bytes before they're written, so it's slow. /C (slice) is not same as /S (split interlace)!

There's no option for binary concatenation of two ROM-dump files into one, as you may use "copy /b file1+file2 file3" (in DOS and windows) or "cat file1 file2 > file3" (in Linux) commands for this purpose.

Linux and windows x86 and x64 versions of ROM-SM 1.5 may be available later. If someone is interested.

SM-ROM ver. 1.5 (16-bit) for DOS - works on 8086/88 CPUs:

EDIT: Attached new DOS version 1.5 in "ROM-SM15.zip".