Tag: SIC/XE
System Software – SIC/XE Program to clear 20 byte string to empty
Problem Statement Write a sequence of instructions for SIC/XE to clear a 20-byte string to all blanks. Solution Line Number(ac) Code Description 1 LDX ZERO 2 LOOP LDCH BLANK 3 STCH STR1,X 4 TIX TWENTY 5 JLT LOOP 6 STR1 RESW 20 7 BLANK BYTE C ‘ ‘ 8 ZERO WORD 0 9 TWENTY WORD 20
System Software – SIC/XE Program to multiply two arrays
Problem Statement Assume that ALPHA and BETA are the two arrays of 100 words. Another array of GAMMA elements are obtained by multiplying the corresponding ALPHA element by 4 and adding the corresponding BETA elements. Solution Line Number Code Comments 1 LDS #3 2 LDT #300 3 LDX #0 4 ADDLOOP LDA ALPHA, X 5 MUL #4 6 ADD BETA,…
System Software – SIC/XE program to clear 20 byte string using Immediate addressing mode.
Problem Statement Write a sequence of instructions for SIC/XE to clear a 20-byte string to all blanks. Use immediate addressing and register-to-register instructions to make the process as efficient as possible. Solution Line Number(ac) Code Description 1 LDT #20 2 LDX #0 3 LOOP LDCH #0 4 STCH STR1,X 5 TIXR T 6 JLT LOOP 7 STR1 RESW 20…
System Software – SIC/XE Program to divide BETA by GAMMA and set quotient and remainder
Problem Statement Write a sequence of instructions for SIC/XE to divide BETA by GAMMA, setting ALPHA to the integer portion of the quotient and DELTA to the remainder. Use register-to-register instructions to make the calculation as efficient as possible. Solution Line Number(ac) Code Description 1 LDA BETA Load the value of BETA to accumulator 2 LDS GAMMA Load the value of GAMMA to register S…
System Software – SIC/XE Program to set 100 elements of the array to 0 using immediate addressing mode
Problem Statement Assume that ALPHA is an array of 100 words. Write a sequence of instructions for SIC/XE to set all 100 elements of the array to 0. Use immediate addressing and register-to-register instructions to make the process as efficient as possible. Solution Line Number Code Comments 1 LDS #3 2 LDT #300 3 LDX #0 4 LOOP LDA #0 5…
System Software – SIC/XE Program to write a subroutine for SIC that writes record on to device 05
Problem Statement Suppose that RECORD contains a 100-byte record. Write a subroutine for SIC that will write this record on to device 05. Solution Line Number Code Comment 1 JSUB WRREC 2 WRREC LDX ZERO 3 WLOOP TD OUTPUT 4 JEQ WLOOP 5 LDCH RECORD, X 6 WD OUTPUT 7 TIX LENGTH 8 JLT WLOOP 9 RSUB…
System Software – SIC/XE Program to set ALPHA=GAMMA*BETA-9 using Register Operation
Problem Statement Write a sequence of instructions for SIC/XE to set ALPHA=GAMMA*BETA-9 using register operation. Solution Line Number(ac) Code Description 1 LDA GAMMA 2 MUL BETA 3 SUB 9 4 STA ALPHA
System Software – SIC/XE Program to arrange an array of 100 words in ascending order
Problem Statement Suppose that ALPHA is an array of 100 words. Write a sequence of instruction for SIC/XE to arrange the 100 words in ascending order and store result in an array BETA of 100 elements. Solution Line Number Code Comments 1 SORT START 0 2 OUTER LDX INDEX 3 LDS ARR1,X 4 LDX #0 5 INNER LDT ARR1,X 6…
System Software – SIC/XE Program to write a subroutine for SIC that will read a record into a buffer
Problem Statement Write a subroutine for SIC that will read a record into a buffer. The record may be any length from 1 to 100 bytes. The end of record is marked with a “null” character (ASCII code 00). The subroutine should place the length of the record read into a variable named LENGTH. Solution Line Number Code Comments 1 RDREC LDX ZERO 2…
System Software – SIC/XE Program to divide BETA by GAMMA and set ALHPA to floating quotient
Problem Statement Write a sequence of instructions for SIC/XE to divide BETA by GAMMA, setting ALPHA to the value of the quotient, rounded to the nearest integer. Use register-to-register instructions to make the calculation as efficient as possible. Solution Line Number(ac) Code Description 1 LDF BETA 2 DIVF GAMMA 3 FIX 4 STA ALPHA 5 ALPHA RESW 1 6 BETA…
System Software – SIC/XE Program to set ALPHA equal to 4 * BETA – 9.
Problem Statement Write a sequence of instructions for SIC/XE to set ALPHA equal to 4 * BETA – 9. Assume that ALPHA and BETA are defined as in Fig 1.3(b). Use immediate addressing for the constants. Solution Line Number(ac) Code Description 1 LDA BETA Load the value of BETA in Accumulator 2 LDS #4 Load the value 4 to Register S 3 MULR S,A Multiply…
System Software – SIC program to set 100 elements of array to Zero
Problem Statement Suppose that ALPHA is an array of 100 words, as defined in Fig. 1.5(a). Write a sequence of instructions for SIC to set all 100 elements of the array to 0. Solution Line Number(ac) Code Description 1 LDA ZERO 2 STA INDEX 3 LOOP LDX INDEX 4 LDA ZERO 5 STA ALPHA, X 6 LDA INDEX 7…
System Software – SIC/XE Program to Write a subroutine to read a record into a buffer
Problem Statement Write a subroutine for SIC/XE that will read a record into a buffer. The record may be any length from 1 to 100 bytes. The end of record is marked with a “null” character (ASCII code 00). The subroutine should place the length of the record read into a variable named LENGTH. Use immediate addressing and register-to-register instructions to make the process as…
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