On Tue, 30 Aug 2011 01:14:45 -0700, glen herrmannsfeldt <[email protected]> wrote:
>The book "Computer Architecture: Concepts and Evolution" by >Blaauw and Brooks has many descriptions on how instructions got >to be the way they did. Thank you! I'll order it. Benyamin and other responders: Thank you for all the good information. I realize that it is a versatile instruction. For the particular application i needed (timestamp conversion to EBCDIC following a STCKCONV), i couldn't make it do everything i wanted, but it did get me 95% of the way there. I used two EDITs, followed by the aforementioned fixup logic on the first digit of the "hour" field. I could also have rearranged the STCKCONV output and used a single EDIT with no fixup. The name of the instruction in the System 360 manual is "Edit". The name of the instruction in the z/Architecture manual is "EDIT". Its mnemonic is always ED. >Then explain that EDIT is rarely used by COBOL or Fortran >for print conversions, and that it is best that it should >be left out of instruction sets. > >If you like asking questions like that, especially for a variety >of different machines, you should get the book. > >-- glen Justin
