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Floating Point representations
- Subject: Floating Point representations
- From: gids.rs@sasktel.net
- Date: Sat, 30 Mar 2013 23:24:45 -0700 (PDT)
- Complaints-to: groups-abuse@google.com
- Injection-date: Sun, 31 Mar 2013 06:24:45 +0000
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Are there any mathematicians out there?
There are quite a few floating point representations of numbers in the Aplsoft ROM. Can anyone help fill in what equations they would be used in or what multiplying the number by will convert to.
$E0FE - 90 80 00 00 00 (-32768)($8000) - largest negative number
$E913 - 81 00 00 00 00 (1) - same as $EF04
$E919 - 7F 5E 56 CB 79 (.434255942)
$E91E - 80 13 9B 0B 64 (.576584541)
$E923 - 80 76 38 93 16 (.961800759)
$E928 - 82 38 AA 3B 20 (2.88539007)
$E92D - 80 35 04 F3 34 (.707106781)
$E932 - 81 35 04 F3 34 (1.41421356)
$E937 - 80 80 00 00 00 (-.5)
$E93C - 80 31 72 17 F8 (.693147181)
$EA50 - 84 20 00 00 00 (10) - used in x/10 and 10^x power
$ED0A - 9B 3E BC 1F FD (100,000,000)
$ED0F - 9E 6E 6B 27 FD (999,999,999)
$ED14 - 9E 6E 6B 28 00 (1E+9)(1,000,000,000)
$EE64 - 80 00 00 00 00 (.5) - used in X/2
can't tell if these 4 are FP reps
$EE69 - FA 0A 1F 00 00 (2.86866289E+36)
$EE6E - 98 96 80 FF F0 (-9863423.94)
$EE73 - BD C0 00 01 86 (-1.72938247E+18)
$EE78 - A0 FF FF D8 F0 (-4.2949573E+09)
$EEDB - 81 38 AA 3B 29 (1.44269504)
$EEE0 - 07 71 34 58 3E (3.54418118E-37)
$EF04 - 81 00 00 00 00 (1) - used in 1/X
$F066 - 81 49 0F DA A2 (1.57079633)
$F06B - 83 49 0F DA A2 (6.28318531) - used in 2*PI
$F070 - 7F 00 00 00 00 (.25) - used in X/4
$F075 - 05 84 E6 1A 2D (-4.88193226E-38)
$F123 - 80 4F C7 52 58 (.811635157)
If any are missed, please add to the list.
Rob