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TI Editor/Assembler Integer Arithmetic
Video (09:43)

In the continuation of the assembly language series, this episode goes over some of the principles of integer arithmetic in TI assembly, including addition, subtraction, multiplication, and division.

In this video, we cover the following:

  • Math in computing
  • Math in TI BASIC, in contrast to assembly
  • Integer format and size
  • Format of addition, subtraction, multiplication, and division in assembly
  • Single-byte math operations
  • Division and modulo
  • Increment, decrement, and absolute value operands
  • Perils of register use and readability
  • Program example - TRIANGLE

TRIANGLE (Assembly language)

Demonstration of assembly from the video. Displays a Sierpinski triangle in bitmap mode.

DEF RUN REF VSBR,VSBW,VWTR,VMBW * VREGS DATA >0002,>01C0,>0206,>03FF DATA >0403,>05F0,>0600,>07F1 DATA 768 PTS DATA 1,128,190,1,190,250 CURPT DATA 1,128 SEED DATA >23A3 RNDM DATA >1FB9 RNDA DATA >6EFB INITCH DATA >0000,>0000,>0000,>0000 INITCO DATA >1F1F,>1F1F,>1F1F,>1F1F CLC DATA 8,256,3,2,4 * INIT * SET VDP REGISTERS LI R4,VREGS MOV @CLC,R2 DOREG MOV *R4+,R0 BLWP @VWTR DEC R2 JNE DOREG * CLEAR SCREEN IMAGE CLR R0 LI R1,INITCH LI R2,8 MOV *R4,R3 INCHL1 BLWP @VMBW A R2,R0 DEC R3 JNE INCHL1 * CLEAR COLOR TABLE LI R0,>2000 LI R1,INITCO MOV *R4,R3 INCHL2 BLWP @VMBW A R2,R0 DEC R3 JNE INCHL2 * RESET PATTERN DESCRIPTOR TABLE LI R0,>1800 CLR R1 MOV *R4,R3 INCHL3 BLWP @VSBW AI R1,>0100 INC R0 DEC R3 JNE INCHL3 RT * GENERATE RANDOM NUMBER RGEN MOV @SEED,R2 MPY @RNDM,R2 A @RNDA,R3 MOV R3,@SEED RT * PLOT A PIXEL PLOTPX CLR R2 CLR R3 CLR R4 MOV R0,R5 DIV @CLC,R4 MPY @CLC,R4 A R5,R2 MOV R1,R5 CLR R4 DIV @CLC,R4 A R5,R2 MOV R1,R5 CLR R4 DIV @CLC,R4 MPY @CLC+2,R4 A R5,R2 * WHICH BIT MOV R0,R5 CLR R4 DIV @CLC,R4 LI R4,>8000 MOV R5,R5 SFT JEQ SFTX SRL R4,1 DEC R5 JMP SFT SFTX MOV R2,R0 BLWP @VSBR SOC R4,R1 BLWP @VSBW RT * MAIN LOOP RUN BL @INIT LOOP BL @RGEN CLR R2 DIV @CLC+4,R2 MPY @CLC+8,R3 MOV R4,R2 * R2 IS (0,4,8) * HALFWAY POINT X MOV @PTS(R2),R3 MOV @CURPT,R4 A R3,R4 CLR R3 DIV @CLC+6,R3 MOV R3,R1 * HALFWAY POINT Y INCT R2 MOV @PTS(R2),R3 MOV @CURPT+2,R4 A R3,R4 CLR R3 DIV @CLC+6,R3 MOV R3,R0 * STORE IN CURPT MOV R0,@CURPT+2 MOV R1,@CURPT BL @PLOTPX * REPEAT JMP LOOP END

Posted in Assembly on 2020-09-23 16:03:00.
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