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FIGURE 8.3 The loader of the Pep/9 operating system. ; ******* System Loader ;Data must be in the following format: ; Each hex number representing a byte must contain exactly two ; characters. Each character must be in 0..9, A. .F, or a. .f and ; must be followed by exactly one space. There must be no ; leading spaces at the beginning of a line and no trailing ; spaces at the end of a line. The last two characters in the ; file must be lowercase zz, which is used as the terminating ; sentinel by the loader. i FC17 C80000 loader: LDWX 0, i ;X < 0 FC1A D1FC15 get Char: LDBA charin, d ; Get first hex character FC1D B0007A CPBA FC20 18FC51 BREQ 'z', i stopLoad ; If end of file sentinel 'z' i then exit loader routine FC23 B00039 CPBA FC26 14FC2C BRLE FC29 600009 ADDA '9',i shift 9, i FC2C ОА shift: ASLA FC2D ОА ASLA FC2E OA ASLA FC2F OA ASLA FC30 F1FC10 STBA FC33 D1FC15 LDBA FC36 B00039 CPBA byte Temp,d charIn, d '9',i FC39 14FC3F BRLE combine FC3C 600009 ADDA 9, i FC3F 80000F combine: ANDA FC42 91FCOF ORA FC45 F50000 STBA 0,x FC48 680001 ADDX 1, i FC4B D1FC15 LDBA charin, d FC4E 12FC1A BR getChar 0x000F, i wordTemp, d ; If character <= '9', assume decimal ; and right nybble is correct digit ; else convert nybble to correct digit ; Shift left by four bits to send ; the digit to the most significant ; position in the byte ; Save the most significant nybble ; Get second hex character ; If character <= '9', assume decimal ; and right nybble is correct digit ; else convert nybble to correct digit ;Mask out the left nybble ; Combine both hex digits in binary ; Store in Mem [X] ;X < X + 1 <- ; Skip blank or i FC51 00 stopLoad: STOP ;

FIGURE 8.3 The loader of the Pep/9 operating system. ; ******* System Loader ;Data must be in the following format: ; Each hex number representing a byte must contain exactly two ; characters. Each character must be in 0..9, A. .F, or a. .f and ; must be followed by exactly one space. There must be no ; leading spaces at the beginning of a line and no trailing ; spaces at the end of a line. The last two characters in the ; file must be lowercase zz, which is used as the terminating ; sentinel by the loader. i FC17 C80000 loader: LDWX 0, i ;X < 0 FC1A D1FC15 get Char: LDBA charin, d ; Get first hex character FC1D B0007A CPBA FC20 18FC51 BREQ 'z', i stopLoad ; If end of file sentinel 'z' i then exit loader routine FC23 B00039 CPBA FC26 14FC2C BRLE FC29 600009 ADDA '9',i shift 9, i FC2C ОА shift: ASLA FC2D ОА ASLA FC2E OA ASLA FC2F OA ASLA FC30 F1FC10 STBA FC33 D1FC15 LDBA FC36 B00039 CPBA byte Temp,d charIn, d '9',i FC39 14FC3F BRLE combine FC3C 600009 ADDA 9, i FC3F 80000F combine: ANDA FC42 91FCOF ORA FC45 F50000 STBA 0,x FC48 680001 ADDX 1, i FC4B D1FC15 LDBA charin, d FC4E 12FC1A BR getChar 0x000F, i wordTemp, d ; If character <= '9', assume decimal ; and right nybble is correct digit ; else convert nybble to correct digit ; Shift left by four bits to send ; the digit to the most significant ; position in the byte ; Save the most significant nybble ; Get second hex character ; If character <= '9', assume decimal ; and right nybble is correct digit ; else convert nybble to correct digit ;Mask out the left nybble ; Combine both hex digits in binary ; Store in Mem [X] ;X < X + 1 <- ; Skip blank or i FC51 00 stopLoad: STOP ;

C++ for Engineers and Scientists
C++ for Engineers and Scientists
4th Edition
ISBN:9781133187844
Author:Bronson, Gary J.
Publisher:Bronson, Gary J.
Chapter8: I/o Streams And Data Files
Section: Chapter Questions
Problem 3PP: (Data processing) Write a C++ program that allows the user to enter the following information from...
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Assume that the loop from FC1A to FC4E is executing for the 30th time. State the values in the following registers as four hexadecimal digits:

(e) A〈8..15〉 after ANDA at FC3F

Assume that the loop from FC1A to FC4E is executing for the 32b time. State the values in the following registers as four hexadecimal digits:

*(b) A〈8..15〉before ASLA at FC2C

FIGURE 8.3 The loader of the Pep/9 operating system. ; ******* System Loader ;Data must be in the following format: ; Each hex number representing a byte must contain exactly two ; characters. Each character must be in 0..9, A. .F, or a. .f and ; must be followed by exactly one space. There must be no ; leading spaces at the beginning of a line and no trailing ; spaces at the end of a line. The last two characters in the ; file must be lowercase zz, which is used as the terminating ; sentinel by the loader. i FC17 C80000 loader: LDWX 0, i ;X < 0 FC1A D1FC15 get Char: LDBA charin, d ; Get first hex character FC1D B0007A CPBA FC20 18FC51 BREQ 'z', i stopLoad ; If end of file sentinel 'z' i then exit loader routine FC23 B00039 CPBA FC26 14FC2C BRLE FC29 600009 ADDA '9',i shift 9, i FC2C ОА shift: ASLA FC2D ОА ASLA FC2E OA ASLA FC2F OA ASLA FC30 F1FC10 STBA FC33 D1FC15 LDBA FC36 B00039 CPBA byte Temp,d charIn, d '9',i FC39 14FC3F BRLE combine FC3C 600009 ADDA 9, i FC3F 80000F combine: ANDA FC42 91FCOF ORA FC45 F50000 STBA 0,x FC48 680001 ADDX 1, i FC4B D1FC15 LDBA charin, d FC4E 12FC1A BR getChar 0x000F, i wordTemp, d ; If character <= '9', assume decimal ; and right nybble is correct digit ; else convert nybble to correct digit ; Shift left by four bits to send ; the digit to the most significant ; position in the byte ; Save the most significant nybble ; Get second hex character ; If character <= '9', assume decimal ; and right nybble is correct digit ; else convert nybble to correct digit ;Mask out the left nybble ; Combine both hex digits in binary ; Store in Mem [X] ;X < X + 1 <- ; Skip blank or <LF> i FC51 00 stopLoad: STOP ;
Transcribed Image Text:FIGURE 8.3 The loader of the Pep/9 operating system. ; ******* System Loader ;Data must be in the following format: ; Each hex number representing a byte must contain exactly two ; characters. Each character must be in 0..9, A. .F, or a. .f and ; must be followed by exactly one space. There must be no ; leading spaces at the beginning of a line and no trailing ; spaces at the end of a line. The last two characters in the ; file must be lowercase zz, which is used as the terminating ; sentinel by the loader. i FC17 C80000 loader: LDWX 0, i ;X < 0 FC1A D1FC15 get Char: LDBA charin, d ; Get first hex character FC1D B0007A CPBA FC20 18FC51 BREQ 'z', i stopLoad ; If end of file sentinel 'z' i then exit loader routine FC23 B00039 CPBA FC26 14FC2C BRLE FC29 600009 ADDA '9',i shift 9, i FC2C ОА shift: ASLA FC2D ОА ASLA FC2E OA ASLA FC2F OA ASLA FC30 F1FC10 STBA FC33 D1FC15 LDBA FC36 B00039 CPBA byte Temp,d charIn, d '9',i FC39 14FC3F BRLE combine FC3C 600009 ADDA 9, i FC3F 80000F combine: ANDA FC42 91FCOF ORA FC45 F50000 STBA 0,x FC48 680001 ADDX 1, i FC4B D1FC15 LDBA charin, d FC4E 12FC1A BR getChar 0x000F, i wordTemp, d ; If character <= '9', assume decimal ; and right nybble is correct digit ; else convert nybble to correct digit ; Shift left by four bits to send ; the digit to the most significant ; position in the byte ; Save the most significant nybble ; Get second hex character ; If character <= '9', assume decimal ; and right nybble is correct digit ; else convert nybble to correct digit ;Mask out the left nybble ; Combine both hex digits in binary ; Store in Mem [X] ;X < X + 1 <- ; Skip blank or <LF> i FC51 00 stopLoad: STOP ;
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ISBN:
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