The VC 3600 Computer

#The VC-3600 Computer

The VC-3600 is a decimal computer with 10,000 words of memory. Each word consists of 6 decimal digits. There is an additional word of memory called the accumulator. The machine language instructions for the VC-3600 is of the following form:

                         |2 digits       | 4 digits       | 
                         |operation code | address portion|

A machine language program is a sequence of machine language instructions stored in memory. The computer executes a machine language program by obeying the commands specified by a sequence of instructions stored in successive memory locations. The first instruction of a program is assumed to be at location 100. The following are the machine language instructions for the VC-3600.

NAME OP. CODE MEANING
ADD 01 ACC <-- c(ACC) + c(ADDR)
SUBTRACT 02 ACC <-- c(ACC) - c(ADDR)
MULTIPLY 03 ACC <-- c(ACC) * c(ADDR)
DIVIDE 04 ACC <-- c(ACC) / c(ADDR)
LOAD 05 ACC <-- c(ADDR)
STORE 06 ADDR <-- c(ACC)
READ 07 A line is read and its first 6 digits are placed in the specified address.
WRITE 08 c(ADDR) is displayed
BRANCH 09 go to ADDR for next instruction
BRANCH MINUS 10 go to ADDR if c(ACC) < 0
BRANCH ZERO 11 go to ADDR if c(ACC) = 0
BRANCH POSITIVE 12 go to ADDR if c(ACC) > 0
HALT 13 terminate execution