By Mark Chasin
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Additional info for Assembly language programming for the Atari computers
There are cautions to observe when using these instructions for this purpose, however, as will be described in Appendix I. Learning Assembly Language 48 The three logical instructions, AND, EOR, and ORA, are simply three ways of comparing two numbers bit by bit. They take the binary forms of the two numbers being compared, and, depending on whether both numbers contain a one or a zero in each bit, produce different results. The AND instruction says "If both bits are 1, the result will also have a 1 in that position.
We also know that we cannot add 12 to the value stored in memory location 752 directly. In order to do this in BASIC, the following program would be required: 10 1= PEEK(752) 20 1 = 1+12 30 POKE 752,1 What we did was pull out the value stored in memory location 752, increase it by 12, and put the new value back into memory location 752. How did we increase the value by 12? We used the accumulator to increase the value of I by 12 in line 20. How we did this, and the exact instructions required for this manipulation, will be covered later.
For example, BASIC has two addressing modes. The first is a direct mode in which the memory location (address) in question is specified directly, for example : 20 POKE 752,1 25 V=PEEK(764) Line 20 tells the computer to put the value 1 into memory location 752. Line 25 tells the computer to look directly into memory location 764, get the value stored there, and then store this value into a variable called V. This direct accessing of one particular memory location is called direct addressing. The second system used in BASI C is more subtle, and is also implied by line 25 above.
Assembly language programming for the Atari computers by Mark Chasin