First Indirect Addressing?

From: Jerome H. Fine <jhfinepw4z_at_compsys.to>
Date: Wed Oct 2 21:24:01 2002

>Will Jennings wrote:

> Well I'm not sure as to indexing, but I know that the entire memory on the
> LGP-30 is the drum.. nothing else, well at least not programmable anyway..
> and no, I/O devices aren't memory! heh

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.
Received on Wed Oct 02 2002 - 21:24:01 BST

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:35:31 BST