3 MB are assigned to each one of the three memory slots. Postmarket upgrades Since 1998, a 1 MiB Flash memory card is available which provides convenient non-volatile storage. Once written to the card, files are safe and not reliant on a power supply. Unlike traditional EPROM cards (erased with an external ultraviolet light), this one can be electrically erased in the computer's slot. The first generation of card only worked in slot 3 where a 12 V signal (Vpp) is available. The later generation is based on AMD chips and runs with 5 V for erasure. It is possible to read, write and erase flash cards in the three slots and the internal one. It is also possible for an experienced user to replace the built-in 32 kB RAM chip with a bigger 128 or 512 kB static RAM chip. However, the latter requires some extra board modifications, and 512 kB is the biggest size that can be addressed by the Z88 for the internal RAM. A similar modification is possible for the internal ROM slot. A 512 kB flash chip can replace the original ROM, allowing an upgrade of the operating system. See also Dot space Exact space References External links Rick Dickinson's "Pandora to Z88" gallery on Flickr Z88 Forever enthusiast site New home for the above algonet.se pages PipeDream book Z88 review, 1989 Computer-related introductions in 1987 Z80-based home computers Home computers Z88 Products introduced in 1987 Portable computers