Editing Tandy Pocket Computer (section)

==Memory==
The total memory capacity of the devices varied from 1&nbsp;[[kilobyte|KB]] to 12&nbsp;KB and up as far as 16&nbsp;KB with the use of an available [[Random Access Memory|RAM]] card (only for some models). The optional RAM cards varied in sizes from 1&nbsp;KB, 4&nbsp;KB and 8&nbsp;KB.

All user storage was taken from the same space, so allocation of arrays using DIM would decrease the available memory for program instructions, and vice versa. However, the storage space for one-character alphabetical variables was pre-allocated, and as a result the A [[array data type|array]] had special significance in many units. For example, in the PC-8, the A array actually [[pointer (computer programming)|pointed]] to the locations of the alphabetical variables, so A(2) pointed to the value of B, and so on. As a result, published programs for the device avoided the use of A as either an array or an alphabetical variable. On some models the entire variable space could be manipulated in this fashion.