By Don Inman
In case you already be aware of easy and feature entry to 1 of the preferred Apple types, you are in your solution to constructing genuine services at the topic. The publication combines colour, pix, and sound with uncomplicated demonstrations that can assist you learn-FAST. you will commence easily, utilizing uncomplicated statements like POKE, PEEK< and speak to to go into and execute desktop language courses. Then you are going to enhance a simple working process, coming into and executing your computer language courses from there. your next step could have you utilizing an Apple process computer screen to software at once and shop the time often had to interpret easy statements. eventually, you are going to methods to use the Apple Mini-Assembler to prevent the difficult information concerned with direct desktop language programming. All in a couple of, quickly stages-you'll be shocked at how easy it truly is!
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Additional info for Apple machine language
Binary Places 27 26 25 :r 0 0 0 1 0 0 1 0 0 1 0 0 1 0 0 0 HEX value 76' 1 2 4 8 49 24 = 16 25 =2*16=32 26 =4*16=64 27 = 8*16 = 128 Next look at the binary place values of the complete 8-bit number. Binary Places 27 0 0 0 0 0 0 0 1 Decimal Equivalent HEX Equivalent 0+0+0+0+0+0+0+ 1 =1 0+0+0+0+0+0+2+0 =2 0+0+0+0+0+4+0+0 =4 0+0+0+0+8+0+0+0 =8 0+0+0+ 16+0+0+0+0 = 16 0+0+32+0+0+0+0+0 =32 0+64+0+0+0+0+0+0 =64 128+0+0+0+0+0+0+0 =128 1 2 4 8 10 20 40 80 2 6 2 5 24 2 3 22 21 2° 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 Using combinations of all eight bits, you may obtain any decimal value from 0 through 255, or any HEX value from 0 through FF.
The computer is composed of many functional parts that we will introduce as needed to explain the operations taking place. The central processing unit of the Apple is a 6502 microprocessor. The following block diagram shows the "parts" we are presently concerned with . 6502 MICROPROCESSOR MEMORY Instruction decoder Accumulator Other controls and registers The instruction decoder of the 6502 "reads" the instruction and decodes it. Most instructions involve the accumulator (discussed later in this chapter) as a center for moving and manipulating data.
The operating system might be compared to an airport traffic controller who directs the flow of traffic in and out of the airport. The operating system directs the flow of actions taken by the computer. A POKE into the operating system's memory locations might alter the operation of the system or the operation of your BASIC program. In addition to the Apple's operating system, you will be using the BASIC Operating System that will be discussed in this chapter. It is written in BASIC, and will be stored in the section of memory that is reserved for BASIC programs (see Memory Map below).