Difference between revisions of "83Plus:OS:Power Usage"
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Revision as of 22:16, 1 May 2011
Somebody posted a questions about power usage, so I decided to some research on the topic. Here are my results. They show that coding practices can have a significant effect on power usage. I also speculate that hooks can adversely affect battery life, too, though more research is needed.
Somebody should Wikify this into a table, and maybe add more data. Be sure to specify your supply voltage with the current measurements.
TI-84+SE Current Draw at 6.25 VDC supply voltage Program Current Notes EOS (aka TIOS) 95.2 microamps "Off" state EOS 1.9 mA Idle, Homescreen EOS 16.1 mA TIOS while sorting programs EOS 7.8 mA Idle, Homescreen after running MirageOS* EOS 16.0 mA Graphing EOS 15.8 mA Archiving program EOS 15.8 mA Garbage Collecting, constant EOS 30.0 mA Garbage Collecting, peak Asm GetKey 1.9 mA Invariant of CPU speed Asm Halt Loop 1.5 mA Invariant of CPU speed Asm DNJZ $ Loop 5.5 mA Invariant of CPU speed MirageOS Password 7.6 mA MirageOS Idle 1.7 mA Tetris Marathon 11.7 mA The Impossible Game 5.2 mA Peaks at 5.9 mA ca. once per second Asm FastCopy loop 6.0 mA for (HL = 0; ; HL+=768) FastCopy(HL); // Pretty fun to watch Asm program holding ON 8.7 mA Running from MirageOS Asm FastCopy loop 7.2 mA With MirageOS Interrupt at minimum (ON+GRAPH) Asm FastCopy loop 6.4 mA With MirageOS Interrupt at maximum (ON+Y=) BASIC Graphing Demo 15.8 mA BASIC runs at 15 MHz BASIC Menu( command 5.7 mA BASIC GetKey Loop 11.4 mA BASIC For(A,1,1000):End 16.0 mA BASIC seq(X,X,999,1,-1) 15.9 mA BASIC SortA(above list) 15.3 mA This "blocks" the ON key BASIC SortA(above list) 12.4 mA While rapidly smashing ON Archive Undeleter 7.4 mA Robot Finds Kitten 7.3 mA The Missile Game 12.0 mA In game The Missile Game 12.9 mA High Score display with noise The Missile Game 16.3 mA Enter High Score screen The Missile Game 1.8 mA Main Menu Omnicalc Font Editor 7.1 mA QWERTY 3.5 mA It behaved really funny Galaxian 5.7 mA Block Dude 4.0 mA Wins the "Most Environmentally Friendly Game" award Axe Parser 15.7 mA Menu screen CaDan 4.9 mA Title screen CaDan 5.2 mA Easy mode CaDan 5.9 mA Easy mode peak current CaDan 4.9 mA Paused CaDan 6.0 mA Lunatic mode CaDan 6.5 mA Lunatic mode peak current * I think that some of the hooks MirageOS installs causes this.
