In a memory in a computer system, buffers are defined by a buffer management system. A set Buffers command defines a number (NP) of pools of buffers, and for each pool, a pool size (PS) of the number of buffers in the pool and the size (BS) of the buffers in that pool. The buffer management system is initialized to store the buffer sizes and to cumulate and store the pool sizes. To address a buffer, the buffer management system determines the address of the start of the buffer from the desired pool and buffer numbers, using the stored information. Also, for updating a paged flash memory, a page Pn of the flash memory (4024) is copied as an image page into RAM memory (4022), and the image page is updated and written back into a different page in the flash memory. A main record table (22) is held in a separate non-volatile memory (EEPROM 4026), identifying valid page pages in the flash memory, and is updated when a page in the flash memory has been updated. The main record table includes a CRC error detection section (25), and is copied into a back-up record table (23) immediately after it has been updated.