http://www.ninerpedia.org/index.php?action=history&feed=atom&title=Radix-100 2026-04-24T17:03:07Z Revision history for this page on the wiki MediaWiki 1.37.1 http://www.ninerpedia.org/index.php?title=Radix-100&diff=48933&oldid=prev 2014-12-07T11:05:38Z

<p>New article on internal representation of numbers- Radix-100 format- from Users Reference Guide</p> <p><b>New page</b></p><div>Radix 100-<br /> <br /> Technically speaking, the TI99/4a uses a 7-digit Radix-100 mantissa for internal calculations. <br /> <br /> A single Radix-100 digit has a range of value from 0 to 99 in base-10 arithmetic. <br /> <br /> This means that a 7-digit Radix-100 number will correspond to decimal precision of 13 to 14 digits, depending on the value.<br /> <br /> <br /> Radix-100 exponents range in value from -64 to +63 which yield decimal values of 10-128 to 10+126. <br /> <br /> The Radix-100 mantissa and exponent combine to provide an equivalent decimal range of from<br /> -9.9999999999999E127 through -1.0000000000000E-128; zero; and then +1.0000000000000E-128 on<br /> through +9.9999999999999E127.<br /> <br /> The internal format of each numerical value consists of eight bytes. The first byte contains the exponent<br /> and its sign, biased by 40 hex. The remaining bytes contain the mantissa, with the most significant digit<br /> first. <br /> <br /> The number is normalized so that the decimal point is immediately after the most significant digit.<br /> <br /> <br /> If the number is negative, then the first two bytes are complemented.<br /> <br /> <br /> Examples<br /> <br /> 1. The number 12710 is represented as:<br /> EXP MSD LSD<br /> 41 01 1B 00 00 00 00 00<br /> <br /> 2. The fraction 0.510 is represented as:<br /> 3F 32 00 00 00 00 00 00<br /> <br /> 3a. The value of pi/2 is represented as:<br /> 40 01 39 07 60 20 43 5F<br /> <br /> 3b. The value of -pi/2 is:<br /> BF FF 39 07 60 20 43 5F<br /> <br /> (extracted from Users Reference Guide)</div>

Stephen Shaw