The key allows for indirection : wherever a reference to a memory register or a program location is allowed, this key can be used to fetch the actual value from a memory register.
22.
Instead, the system implemented a display system that used a single 20-bit memory register that could be copied or mirrored on the right half of the screen to make what was effectively a 40-bit display.
23.
Leading zeros also present whenever the number of digits is technically fixed ( such as in a memory register ), but the stored value is not large enough to result in a non-zero most significant digit.
24.
For example, the key sequence means to fetch the value in memory register 10, and use that value in turn as the number of a memory register whose contents are to be fetched as the current operand.
25.
For example, the key sequence means to fetch the value in memory register 10, and use that value in turn as the number of a memory register whose contents are to be fetched as the current operand.
26.
There were three machines by this name made by TI, the first was the TI-57 with LED display released in September 1977 along the more powerful TI-58 and TI-59 . It had 50 program steps and 8 memory registers.
27.
Although the TI-59 was Turing-complete, supporting straight-line programming, conditions, loops, and indirect access to memory registers, and although it supported limited alphanumeric output on the printer only, writing sophisticated routines was essentially a matter of planning machine language and using a coding pad.
28.
:If the PRNG does not use an external source of randomness ( in which case it wouldn't be a "'P "'RNG ) and uses only a bounded amount of memory registers, say N bits, then the sequence is guaranteed to repeat eventually in a cycle of length d " 2 N.
29.
This mode is called " GRAPHICS 7 " in Atari BASIC . The use of an indirect palette means that color changes associated with the presence or absence of energy shields, emergency alarms, and the screen flash representing destruction of the ship can be accomplished by simply changing the palette values in memory registers.
