50g

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--- In 50g@yahoogroups.com, "John Dearing" <JSDearing@...> wrote:
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> 50g TIPS
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> Please submit yours to share!  --John
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> ABBREVIATIONS USED: PLUS: The “+” symbol, when shown between two
keys without spaces or commas, means press and hold the first key,
press and release the second key, then release the first key. LS =
Left Shift key. RS = Right Shift key. ◄ ► ▲ ▼ = the cursor
control keys. STO = STO► [the STORE key].
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> TO GET THE “UPDATE CODE” PROMPT TO UPDATE ROM WITHOUT USING
PAPERCLIP: Press ON+F6 [press and hold ON, press and release F6,
release ON]; wait about 3 seconds for a menu of options; press and
release ON, then immediately press and hold both the + and the â€"
keys for 2-3 seconds; release both keys, see “1. UPDATE CODE  2.
SELFTEST”; press 1 to update ROM without having to use a paperclip
in the reset hole. To cancel, press 2 to start the selftest, then
cancel that with ON+F3.
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> "HOLDED" KEY COMBINATIONS: On the 50g, if you press Left Shift [or
Right Shift] and release, then press another key, that key press
combination is different than if you press Left Shift [or Right Shift]
and hold it while you press the next key. The rc.p keycode (row column
. plane) for the held keys is now rc.ph (where h is 1 for held key and
0 for non-held key).
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> EXACT & APPROXIMATE MODE TOGGLE: RS+ENTER.
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> REAL & COMPLEX MODE TOGGLE: LS+TOOL.
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> PUT BACK TICKS ON THE STACK: If you right-shift (hold) the EQW key
('), you will put back ticks on the stack which will use the Algebraic
compiler to parse your command while in RPN mode.
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> TO LIST CONTENTS OF ALL VARIABLES IN SCREEN: Press RS, ▼ [Right
Shift, Cursor Down]. Press ON to cancel.
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> UNIT CONVERSIONS MADE EASY: Unit conversions like yd^3â†'m^3 can be
keystroke-intensive. To make it easy, have flag 117 (Soft MENU)
checked, and RPN mode selected. Example: convert 100 yd^3 to m^3:
press RS, UNITS, VOL, type ‘100’, yd^3 [see “100_yd^3”], LS,
m^3. See “76.4554857984_m3”. You only have to use CONVERT if you
have some units that aren’t on the menus, like ‘qt/hr’. Even
then, you can store that unit in a variable, and make a custom menu
with it (along with the units you regularly use). Then this method
(with LS, the left-shift key) works the same way.
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> FRACTIONAL EXPONENTS: Why do I get a complex number when I evaluate
'(-1)^(2/3)'? Because the machine returns a complex principal solution
for expressions with fractional exponents. To get a real-valued result
to the above, use the x√y key:  'XROOT(3,(-1)^2)' or 'XROOT(3,SQ(-1))'.
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> STORE VARIABLES: Example: Store 'π*r2' in variable A1:
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> ALG:  'π*r^2  ►  STO  A1  ENTER
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> RPN Method 1:  π  r  ENTER  2  yx  *  A1  STO
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> RPN Method 2a:  'π*r^2  ►  A1  STO
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> RPN Method 2b:  'π*r^2  ENTER  A1  STO
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> PURGE VARIABLES: 
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> ALG:  TOOL  PURGE  VAR  [press variable softkey]  ENTER
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> RPN Method 1:  VAR  '  [press variable softkey]  ENTER  TOOL  PURGE
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> RPN Method 2:  VAR  {  [press one or more variable softkeys]  ENTER
 TOOL  PURGE
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