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Historically, combinations had been made by Wordmongers, Ranger Computers and Steve Marsh for the Z88 User Group using the larger 128K or 256K EPROM cards. These were hard crafted and beyond the skills of the Z88 user. Gary Lancaster wrote the first version that allowed users to read Applications applications or combinations from ROM devices, Combine combine them, check that the target EPROM has been erased properly and then finally blow the combined result into it.
When the flash card and OZ 4.2 were produced, RomCombiner was modified so that applications could be added on these devices as well.
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Romcombiner v2.11 (compiled on 01/08/2022, 12 (now supports the same flash memory types as OZ 5.0)
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Flash and EPROM cards may be used for Applications and/or the File Area. The main difference between these cards is how they are erased. The EPROM card is put into an eraser, exposing the chip to UV light. This erases everything on that card. The Flash card is erased within the Z88 itself and has the added bonus that it can be erased in 64K chunkssectors. This means that the file area can be erased, whilst retaining the application area. If using a Flash card, to avoid wasted space, ensure the - Application area is in 64K chunks laid out to fully consume 64K sectors.
Since January 2023, RomCombiner supports SST Flash memory which uses a 4K sector size, allowing it to erase individual 16KB banks - the Z88's own unit of allocation.
Each application is allocated a letter called a Key and a name which can be changed i.e. P for PipeDream. The second time and third time the key letter is used, a Z or ZZ is prefixed before that letter. If that letter is used again, it will be no longer available and will not be shown - i.e. ZP and ZZP. - A Key letter may only be used 3 times
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