MOVTC

Purpose

to move and translate character string

Format

opcode srclen.rw, srcaddr.ab, fill.rb, tbladdr.ab, dstlen.rw, dstaddr.ab

Operation

Condition codes

N ß srclen LSS dstlen;

Z ß srclen EQL dstlen;

V ß 0;

C ß srclen LSSU dstlen;

Exceptions

None

Opcodes

2E        MOVTC                      Move Translated Characters

Description

The source string specified by the source length and source address operands is translated and replaces the destination string specified by the destination length and destination address operands. Translation is accomplished by using each byte of the source string as an index into a 256-byte table whose zeros entry address is specified by the table address operand. The byte selected replaces the byte of the destination string. If the destination string is longer than the source string, the highest addressed bytes of the destination string are replaced by the fill operand. If the destination string shorter than the source string, the highest addressed bytes of the source string are not translated and moved. The operation of the instruction is such that overlap of the source and destination strings does not affect the result. It the destination string overlaps the translation table, the destination string is unpredictable.

Notes

1 After execution:

            R0 = number of translated bytes remaining in source      string, R0 is non-zero only if source string is longer than          destination string.

            R1 = address of one byte beyond the last byte in Source           string that was translated.

            R2 = 0

            R3 = address of the translation table.

            R4 = 0

            R5 = address on one byte beyond the destination string