Motorola Axiom CMD11E1 Betriebsanweisung PDF herunterladen (Seite 11)

1.2. TASKS 11

call C100

Note you can abbreviate any command by entering enough characters to identify

it. Since no other command starts with the letter c, you could also have typed c

C100

. When the control is returned to BUFFALO, it prints the contents of all

the registers and you should see something like:

>CALL C100

P-C10C Y-AAAA X-AAAA A-EA B-AA C-D8 S-004A

Do a memory dump of locations D000-D00F. You should see something like:

>md D000 D00f

D000 10 32 A8 EA FF FF FF FF FF FF FF FF FF FF FF FF 2

Exercises

1. Modify the values in locations D000-D00f and run your program. Write

down the values in the locations D000-D003 and the value in register A,

after you run the program.

2. Repeat the above 5 times and explain your results.

1.2.6 Entering your program: Using ASM

We will reenter your program, except we will store it at a diﬀerent location.

Enter the program starting at address C200, using the asm command. When you

enter the ASM command, BUFFALO will display instruction currently stored in

memory (or a question mark if it is not a valid instruction). You can press enter

if you want to leave memory unchanged or type the command and then press the

enter key. On power-up, the BUFFALO performs a memory check and ﬁlls all

of RAM with FF. FF happens to be the code for STX. So ASM command will

often display STX $FFFF

. Here is how I entered the program at location C200.

What I typed is shown in boldface:

An alternative to call is the go command, G. There is no diﬀerence between them if your

program ends with SWI. However, if your code ends with an RTS, you have to use the call

command.

BUFFALO expects all its data to be entered in HEX. So you do NOT type the $ in front of

numb ers to indicate that the number is entered using HEX representation. However, BUFFALO

adds the $ in front of the numbers written using HEX representation

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Motorola Axiom CMD11E1 Betriebsanweisung Seite 11