First Indirect Addressing?

Jerome Fine replies: When I first saw this line, I did not thing of a drum system as having indirect addressing. However, if this qualifies, then the IBM 650 system that must have been produced prior to 1960 (I used one in 1960) also had a drum to hold both instructions and data. Each IBM 650 instruction was 10 decimal digits - the IBM 650 was NOT a binary computer. The first 2 decimal digits were the op code. the next 4 decimal digits were the address of the operand. The last 4 decimal digits were the ADDRESS of the next instruction on the drum. The assembler program to convert the source language into machine language was called SOAP - Symbolic Optimal Assembly Program. Sincerely yours, Jerome Fine -- If you attempted to send a reply and the original e-mail address has been discontinued due a high volume of junk e-mail, then the semi-permanent e-mail address can be obtained by replacing the four characters preceding the 'at' with the four digits of the current year.