Atari Emulator And 65 Professional Machine Language#

Atari Emulator And 65 Professional Machine Language

While DOS XL is a strong DOS, itвЂ™s not my favorite. The HAC/d5 ToolKit is perfect for both the beginning and the professional machine language programmer.The disk based Mac/65 comes with OSS (FTE) DOS XL. The HAC/65 ToolKit is an extensive collection of macros coupled with precisely written run-time code which greatly facilitates machine language programming on the Atari computer using either the disk or cartridge version of MAC/65.

Pamana MAC/65 - macros, fast ATARI MACRO-80 - CPM80 ORCA/M - Reloc. The Stella emulator installs on your Mac like most other macOS utilities: all you have to do is drag and drop its icon on top of the Applications directory. User friendly and easy to install Atari 2600 emulator. Those are just suggestions, you are welcome to download any gameStella is a simple emulator ported to macOS that enables you to play your favorite Atari games on your brand new Mac. This is how I did it.In the Educational genre, you may want to play 10 Little Robots, 123-Talk, 1893: A World's Fair Mystery, 2x2, 3-D Dinosaur Adventure.

Instead of naming it SD720K, name it something like вЂњMAC65SDвЂќ for Mac/65 SpartaDOS. First stop, create that image (with DOS installed on it вЂ“ all files). I showed you how to create a 720K disk image for use in the Atari 8 bit emulators in this blog entry.

Use the SpartaDOS copy command to copy them from D2 to D1 (assuming your Mac/65 4.2 disk is in drive 2 and your new SpartaDOS image is in drive 1): They are boxed in red in the image. Copy the following files from the Mac/65 disk to your new disk image. Proceed when the SpartaDOS вЂњD1:вЂќ prompt appears.

Program ConstructionWhen writing an assembly program the first thing that must be done is to define the programs load address (memory location). While IвЂ™m learning I will be using OSS Mac/65 Assembler. I explored the basic program construction, and the accumulator. From the SpartaDOS вЂњD1:вЂќ prompt, enter вЂњMAC65вЂќ to run Mac/65:When I jumped from reading about 6502 assembly to writing a small program I started small. Eject the Mac/65 4.2 disk from drive 2, you no longer need it.

MUST be followed by a space or TAB. Start at whatever you want and increment as you go. The syntax is:A brief explanation of each component of the syntax: After its assembled, its ready for execution.When writing 6502 assembler, each line has a syntax that must be followed. IвЂ™m using OSS Mac/65, but there are others such as the Atari Assembler Editor, and Synapse SynAssembler. As I learn more about the address decision IвЂ™ll write about it.The structure of a 6502 assembly program is:Once the program is written it needs to be assembled by the assembler.

They are designated by the semi-colon character. Comment вЂ“ Comments are just that, comments about the code from the author. Such as вЂњ#FFвЂќ, or вЂњ$3800вЂќ. Operand вЂ“ Parameter to opcode instructionsВ which areВ literal values, memory locations, or memory locations and register references. Opcode вЂ“ The command (instruction) to execute such as LDA, STA. If no label is used, press TAB to skip this field, otherwise the assembler will barf.

вЂњ*=вЂќ вЂ“ This is the origin, or load address of the program. Here are the required ones, others will be introduced as I start using them: These are assembler commands, not 6502 instructions.

Specifically, load and store. It tells the assembler to exit the program.The accumulator is a CPU register that is used for arithmetic and data manipulation.The first 6502 instructions I explore deal with the accumulator. вЂњ.ENDвЂќ вЂ“ This terminates the program. вЂњ.OPT OBJвЂќ вЂ“ This is required for Mac/65 to product object code. It requires one parameter which is the load address for the program.

101: Tell Mac/65 to product object code RTS (ReTurn from Subroutine): Returns program execution to the next address after the JSR (Jump to SubRoutine) instruction whichВ called the jump.With this new knowledge I constructed a small 6502 assembly program that sets a few of my console preferences such as color, key rate, etc. STA (STore Accumulator): Stores the contents of the accumulator to a memory location. LDA (LoaDВ Accumulator): Loads the accumulator with a value or the contents of a memory location. The definitions of the instructions are:

210: Load the accumulator with decimal value 1 200: Store the accumulators contents (decimal 12) into memory location 709 (the text color for graphics 0 display mode) 190: Load the accumulator with hex value 0C 180: Store the accumulators contents (decimal 4) into memory location 710 (the background color for graphics 0 display mode) I just wanted to experiment with different value types. This could easily have been decimal value 4.

Assemble the program to file with вЂњASM ,#D:PREFS.COMвЂќWith Mac/65 you can turn the assembly screen listing off. Load the program with вЂњENTER #D:PREFS.M65вЂќ.In Mac/65 you assemble the program using the ASM command. Save the program with вЂњLIST #D:PREFS.M65вЂќ. In Mac/65, simply enter вЂњLISTвЂќ.To list a specific section or line number range, enter вЂњLIST start,endвЂќ where start is the starting line number you want to see, and end is the last line number you want to see.In Mac/65 you save a program using LIST and load it with ENTER. I initially didnвЂ™t have a return and the results were unpredictable from strange errors, to system crashes.While writing or editing a program it is often useful to list the program to the screen so blocks of code can be seen together.

From my program I see location 381A contains вЂњ8DDB02вЂќ, and 381D contains вЂњ60вЂќ. What the listing displays (see screenshot above) is the address in memory the instruction is loaded into, the machine object code of the instruction, and the assembly line as it was entered.If you dump the addresses in memory where the program was assembled to, the byte values should match what was in the second column of the assembly listing during the assembly process. As a beginner IвЂ™ll leave it on.

Atari Emulator And Mac 65