Added preliminary PDP-10 opcode decoding
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Jeff Parsons
Jeff Parsons
parent
e3ab5b1ed5
commit
0451774bc6
5 changed files with 380 additions and 345 deletions
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@ -38,22 +38,22 @@ if (NODE) {
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*
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* From the DEC PDP-10 System Reference Manual (May 1968), p. 2-64:
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*
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* Store the instruction code, A and the effective address E in bits 0-8, 9-12 and 18-35 respectively of
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* location 40; clear bits 13-17. Execute the instruction contained in location 41. The original contents
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* of location 40 are lost.
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* Store the instruction code, A and the effective address E in bits 0-8, 9-12 and 18-35 respectively of
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* location 40; clear bits 13-17. Execute the instruction contained in location 41. The original contents
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* of location 40 are lost.
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*
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* All of these codes are equivalent when they occur in the Monitor or when time sharing is not in effect.
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* But when a UUO appears in a user program, a code in the range 001-037 uses relocated locations 40 and 41
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* (ie 40 and 41 in the user's block) and is thus entirely a part of and under control of the user program.
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* All of these codes are equivalent when they occur in the Monitor or when time sharing is not in effect.
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* But when a UUO appears in a user program, a code in the range 001-037 uses relocated locations 40 and 41
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* (ie 40 and 41 in the user's block) and is thus entirely a part of and under control of the user program.
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*
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* A code in the range 040-077 on the other hand uses unrelocated 40 and 41, and the instruction in the latter
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* location is under control of the Monitor; these codes are thus specifically for user communication with
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* the Monitor, which interprets them (refer to the Monitor manual for the meanings of the various codes).
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* A code in the range 040-077 on the other hand uses unrelocated 40 and 41, and the instruction in the latter
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* location is under control of the Monitor; these codes are thus specifically for user communication with
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* the Monitor, which interprets them (refer to the Monitor manual for the meanings of the various codes).
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*
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* The code 000 executes in the same way as 040-077 but is not a standard communication code: it is included
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* so that control returns to the Monitor should a user program wipe itself out.
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* The code 000 executes in the same way as 040-077 but is not a standard communication code: it is included
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* so that control returns to the Monitor should a user program wipe itself out.
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*
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* For a second processor connected to the same memory, the UUO trap is locations 140-141 instead of 40-41.
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* For a second processor connected to the same memory, the UUO trap is locations 140-141 instead of 40-41.
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*
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* @this {CPUStatePDP10}
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* @param {number} opCode
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@ -68,18 +68,18 @@ PDP10.opUUO = function(opCode)
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*
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* From the DEC PDP-10 System Reference Manual (May 1968), p. 2-37:
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*
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* Floating add the contents of location E to AC. If the double length fraction in the sum is zero, clear
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* accumulator A+1. Otherwise normalize the sum only if the magnitude of its fractional part is >= 1, and place
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* the high order part of the result in AC A+1. The original contents of AC and E are unaffected.
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* Floating add the contents of location E to AC. If the double length fraction in the sum is zero, clear
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* accumulator A+1. Otherwise normalize the sum only if the magnitude of its fractional part is >= 1, and place
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* the high order part of the result in AC A+1. The original contents of AC and E are unaffected.
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*
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* NOTE: The result is placed in accumulator A+1. T his is the only arithmetic instruction that stores the result
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* in a second accumulator, leaving the original operands intact.
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* NOTE: The result is placed in accumulator A+1. T his is the only arithmetic instruction that stores the result
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* in a second accumulator, leaving the original operands intact.
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*
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* If the exponent of the sum following the one-step normalization is > 127, set Overflow and Floating Overflow;
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* the result stored has an exponent 256 less than the correct one.
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* If the exponent of the sum following the one-step normalization is > 127, set Overflow and Floating Overflow;
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* the result stored has an exponent 256 less than the correct one.
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*
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* SIDEBAR: The exponent of the sum is equal to that of the larger summand unless addition of the fractions
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* overflows, in which case it is greater by 1. Exponent overflow can occur only in the latter case.
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* SIDEBAR: The exponent of the sum is equal to that of the larger summand unless addition of the fractions
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* overflows, in which case it is greater by 1. Exponent overflow can occur only in the latter case.
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*
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* @this {CPUStatePDP10}
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* @param {number} opCode
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@ -94,11 +94,11 @@ PDP10.opUFA = function(opCode)
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*
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* From the DEC PDP-10 System Reference Manual (May 1968), p. 2-37:
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*
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* Negate the double length floating point number composed of the contents of AC and location E with AC on the left.
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* Do this by taking the twos complement of the number whose sign is AC bit 0, whose exponent is in AC bits 1-8, and
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* whose fraction is the 54-bit string in bits 9-35 of AC and location E. Place the high order word of the result
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* in AC; place the low order part of the fraction in bits 9-35 of location E without altering the original contents
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* of bits 0-8 of that location.
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* Negate the double length floating point number composed of the contents of AC and location E with AC on the left.
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* Do this by taking the twos complement of the number whose sign is AC bit 0, whose exponent is in AC bits 1-8, and
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* whose fraction is the 54-bit string in bits 9-35 of AC and location E. Place the high order word of the result
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* in AC; place the low order part of the fraction in bits 9-35 of location E without altering the original contents
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* of bits 0-8 of that location.
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*
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* @this {CPUStatePDP10}
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* @param {number} opCode
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@ -113,24 +113,24 @@ PDP10.opDFN = function(opCode)
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*
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* From the DEC PDP-10 System Reference Manual (May 1968), p. 2-34:
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*
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* If the fractional part of AC is zero, clear AC. Otherwise add the scale factor given by E to the exponent part
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* of AC (thus multiplying AC by 2^E), normalize the resulting word bringing 0s into bit positions vacated at the
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* right, and place the result back in AC.
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* If the fractional part of AC is zero, clear AC. Otherwise add the scale factor given by E to the exponent part
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* of AC (thus multiplying AC by 2^E), normalize the resulting word bringing 0s into bit positions vacated at the
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* right, and place the result back in AC.
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*
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* NOTE: A negative E is represented in standard twos complement notation, but the hardware compensates for this
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* when scaling the exponent.
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* NOTE: A negative E is represented in standard twos complement notation, but the hardware compensates for this
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* when scaling the exponent.
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*
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* If the exponent after normalization is > 127, set Overflow and Floating Overflow; the result stored has an
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* exponent 256 less than the correct one. If < -128, set Overflow, Floating Overflow and Floating Underflow;
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* the result stored has an exponent 256 greater than the correct one.
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* If the exponent after normalization is > 127, set Overflow and Floating Overflow; the result stored has an
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* exponent 256 less than the correct one. If < -128, set Overflow, Floating Overflow and Floating Underflow;
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* the result stored has an exponent 256 greater than the correct one.
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*
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* SIDEBAR: This instruction can be used to float a fixed number with 27 or fewer significant bits. To float an
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* integer contained within AC bits 9-35,
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* SIDEBAR: This instruction can be used to float a fixed number with 27 or fewer significant bits. To float an
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* integer contained within AC bits 9-35,
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*
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* FSC AC,233
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* FSC AC,233
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*
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* inserts the correct exponent to move the binary point from the right end to the left of bit 9 and then normalizes
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* (233(base 8) = 155(base 10) = 128 + 27).
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* inserts the correct exponent to move the binary point from the right end to the left of bit 9 and then normalizes
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* (233(base 8) = 155(base 10) = 128 + 27).
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*
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* @this {CPUStatePDP10}
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* @param {number} opCode
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@ -145,19 +145,19 @@ PDP10.opFSC = function(opCode)
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*
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* From the DEC PDP-10 System Reference Manual (May 1968), p. 2-16:
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*
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* Increment the byte pointer in location E as explained above.
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* Increment the byte pointer in location E as explained above.
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*
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* FROM ABOVE: To facilitate processing a series of bytes, several of the byte instructions increment the pointer,
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* ie, modify it so that it points to the next byte position in a set of memory locations. Bytes are processed from
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* left to right in a word, so incrementing merely replaces the current value of P by P - S, unless there is
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* insufficient space in the present location for another byte of the specified size (P - S < 0). In this case Y is
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* increased by one to point to the next consecutive location, and P is set to 36 - S to point to the first byte at
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* the left in the new location.
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* FROM ABOVE: To facilitate processing a series of bytes, several of the byte instructions increment the pointer,
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* ie, modify it so that it points to the next byte position in a set of memory locations. Bytes are processed from
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* left to right in a word, so incrementing merely replaces the current value of P by P - S, unless there is
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* insufficient space in the present location for another byte of the specified size (P - S < 0). In this case Y is
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* increased by one to point to the next consecutive location, and P is set to 36 - S to point to the first byte at
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* the left in the new location.
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*
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* CAUTION: Do not allow Y to reach maximum value. The whole pointer is incremented, so if Y is 2^18 - 1 it becomes
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* zero and X is also incremented. The address calculation for the pointer uses the original X, but if a priority
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* interrupt should occur before the calculation is complete, the incremented X is used when the instruction is
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* repeated.
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* CAUTION: Do not allow Y to reach maximum value. The whole pointer is incremented, so if Y is 2^18 - 1 it becomes
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* zero and X is also incremented. The address calculation for the pointer uses the original X, but if a priority
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* interrupt should occur before the calculation is complete, the incremented X is used when the instruction is
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* repeated.
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*
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* @this {CPUStatePDP10}
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* @param {number} opCode
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