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From: ForthNet@willett.pgh.pa.us (ForthNet articles from GEnie)
Newsgroups: comp.lang.forth
Subject: Conventions and "tricks" used in Forth
Message-ID: <2471.UUL1.3#5129@willett.pgh.pa.us>
Date: 8 Mar 91 05:03:22 GMT
Organization: (n.) to be organized.  But that's not important right now.
Lines: 59


 Date: 03-04-91 (18:48)              Number: 1406 of 1406
   To: CHARLIE HITSELBERGER          Refer#: NONE
 From: IAN WATTERS                     Read: NO
 Subj: AUTO-INCREMENTING             Status: PUBLIC MESSAGE
 Conf: FORTH (58)                 Read Type: GENERAL (+)

 CH>Another question:  I'm using hardware with a 40*25 video display, and
 CH>forth blocks are 64*16 by convention.

 On a machine with a 40 column display, it's easiest to make blocks 512 bytes
 long and display them as 32x16...  The only layout problems I had using this
 arrangement were with long code words which often overflowed onto the next
 block.

 One system (rqFORTH on the BBC Micro) had the following word:

   : ->>   (S -- )
      2 BLK +!  0 >IN ! ;  IMMEDIATE

 ie just like --> except that you skip a screen.  The skipped screens could
 then be used for comments, so when they were printed out it looked like:

 ----------------------------------------------
   Screen 6                 Screen 7

    code                     comments on
    more code                screen 6
    etc        ->>

   Screen 8                 Screen 9

    code                    comments on
    more code                screen 8
    etc        ->>

   Screen 10                Screen 11

    code                     comments on
    more code                screen 10
    etc        ->>

 ----------------------------------------------

 This worked well and 32x16 *does* encourage short definitions!

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