Write-once memory

Write-Once-Memory (WOM), i.e. memory that can be written to once , is the name for a RAM memory as it was used in the first Amiga computer Amiga 1000 . The basic operating system of the Amiga computer , the so-called Kickstart , was stored in this memory and copied from a floppy disk . Then the write signal for this memory area was switched off by a special logic on the motherboard in such a way that it could not be reactivated by any software command. This memory could only be read out until the computer was switched off and on again ( cold start ). A restart (warm start) did not delete this memory area, so that the user was also spared reloading the Kickstart disk.