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From: bson@rice-chex.ai.mit.edu (Jan Brittenson)
Newsgroups: comp.sys.handhelds
Subject: RPL constructs
Message-ID: <11408@life.ai.mit.edu>
Date: 17 Oct 90 00:28:05 GMT
Sender: news@ai.mit.edu
Organization: nil
Lines: 131


   Could someone who knows, please describe how conditionals, loops,
and CASEs are stored internally? I need it to get SAD 1.02 to
disassemble RPL code. Actually, it already does, but I intend to
supply macros for common RPL constructs to get the indentation
correct.

   Oh, and could someone explain what reals (i.e. 64-bit floating
point words) look like? Things like how the exponent is stored, the
exponent sign, the mantissa sign, etc. I haven't done any thorough
investigation here, and only know vaguely what is what.

   Also, please voice your opinion on the following (PROGRAM and END
are SAD macros, which currently is the only way to define proper
indentation among other things) format:


1cb86   Cmd_TYPE:
1cb86 d9d20    PROGRAM
1cb8b 5aa81      #18aa5
1cb90 d9d20      PROGRAM
1cb95 d9f81        #18f9d
1cb9a 9ff30        Short_1		; ; #3ff9
1cb9f 4b2a2        Real_0		; ; #2a2b4
1cba4 30040        Short_2		; ; #4003
1cba9 9c2a2        Real_1		; ; #2a2c9
1cbae d0040        Short_3		; ; #400d
1cbb3 ed2a2        Real_2		; ; #2a2de
1cbb8 71040        Short_4		; ; #4017
1cbbd 1bdc1        #1cdb1
1cbc2 12040        Short_5		; ; #4021
1cbc7 d13a2        Real_5		; ; #2a31d
1cbcc b2040        Short_6		; ; #402b
1cbd1 233a2        Real_6		; ; #2a332
1cbd6 53040        Short_7		; ; #4035
1cbdb 743a2        Real_7		; ; #2a347
1cbe0 f3040        Short_8		; ; #403f
1cbe5 4ddc1        #1cdd4
1cbea 94040        Short_9		; ; #4049
1cbef 173a2        Real_9		; ; #2a371
1cbf4 d5040        Short_0bh		; ; #405d
1cbf9 7e056        Real_10		; ; #650e7
1cbfe 76040        Short_0ch		; ; #4067
1cc03 3392010      REAL 1.1E1
      0000000
      0000110
1cc18 17040        Short_0dh		; ; #4071
1cc1d 3392010      REAL 1.2E1
      0000000
      0000210
1cc32 b7040        Short_0eh		; ; #407b
1cc37 3392010      REAL 1.3E1
      0000000
      0000310
1cc4c 58040        Short_0fh		; ; #4085
1cc51 3392010      REAL 1.4E1
      0000000
      0000410
1cc66 52140        Short_1fh		; ; #4125
1cc6b 3392010      REAL 2.0E1
      0000000
      0000020
1cc80 03b46        Short_2fh		; ; #64b30
1cc85 3392010      REAL 1.5E1
      0000000
      0000510
1cc9a 11920f3      ADDRESS #3f
      000
1cca4 3392010      REAL 2.1E1
      0000000
      0000120
1ccb9 11920f4      ADDRESS #4f
      000
1ccc3 3392010      REAL 2.2E1
      0000000
      0000220
1ccd8 11920f5      ADDRESS #5f
      000
1cce2 3392010      REAL 2.3E1
      0000000
      0000320
1ccf7 11920f6      ADDRESS #6f
      000
1cd01 3392010      REAL 2.4E1
      0000000
      0000420
1cd16 11920f7      ADDRESS #7f
      000
1cd20 3392010      REAL 2.5E1
      0000000
      0000520
1cd35 e2d46        Short_8fh		; ; #64d2e
1cd3a 3392010      REAL 1.6E1
      0000000
      0000610
1cd4f 06d46        Short_9fh		; ; #64d60
1cd54 3392010      REAL 1.7E1
      0000000
      0000710
1cd69 11920fa      ADDRESS #af
      000
1cd73 3392010      REAL 2.6E1
      0000000
      0000620
1cd88 fef30        Short_0		; ; #3fef
1cd8d 3392010      REAL 2.7E1
      0000000
      0000720
1cda2 b2130      END
1cda7 b9f06      #60f9b
1cdac b2130    END
1cdb1 d9d20    PROGRAM
1cdb6 88130      Dup			; ; #3188
1cdbb b3226      #6223b
1cdc0 8da16      #61ad8
1cdc5 3f2a2      Real_3			; ; #2a2f3
1cdca 803a2      Real_4			; ; #2a308
1cdcf b2130    END
1cdd4 d9d20    PROGRAM
1cdd9 9af16      #61fa9
1cdde da916      Branch_if_true		; ; #619ad
1cde3 c53a2      Real_8			; ; #2a35c
1cde8 d2a62      #26a2d
1cded 39916      Branch_if_false	; ; #61993
1cdf2 3392010    REAL 1.8E1
      0000000
      0000810
1ce07 3392010    REAL 1.9E1
      0000000
      0000910
1ce1c b2130    END