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Section 14: Flags continue 232
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Display Format Flags ( FIX = flag 40,
ENG = flag 41). When flag 40 is set, the
HP-41C is in FIX display format (when flag 40 is set,
flag 41 is always clear). If flag 41 is set, the calculator is in
ENG display format (when flag 41 is set, flag 40 is
always clear). When both flags 40 and 41 are clear, the calculator is in
SCI format. The number of digits displayed is
determined by flags 36 through 39.
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Grads Mode Flag (flag 42). If flag 42 is set, the calculator is in GRAD
mode (when flag 42 is set, flag 43 is clear).
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Radians Mode Flag (flag 43). If flag 43 is set, the HP-41C is in RAD mode
(When flag 43 is set, flag 42 is clear).
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Continuous On Flag (flag 44). Flag 44 controls whether the HP-41C is in
continuous on power mode or not. When set, the HP-41C is in continuous on power mode.
When clear, the calculator automatically turns off after 10 minutes of inactivity.
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System Data Entry Flag (flag 45). This flag is used internally by the HP-41C in
data entry. It always tests clear for you.
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Partial Key Sequence (flag 46). This flag is used internally by the HP-41C in
function execution. It always tests clear for you.
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Shift Set Flag (flag 47). Flag 47 is used internally in shifted operations and
always tests clear for you.
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ALPHA Mode Flag (flag 48). This flag is used for ALPHA mode control. When the
HP-41C is in ALPHA mode, flag 48 is set, when not, flag 48 is clear.
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Low Battery Flag (flag 49). The low battery flag is used to indicate low battery
power. When set, power is low. When clear, power is sufficient. Refer to Batteries,
appendix B,
for battery replacement instructions. Remember that when battery power is low,
the BAT annunciator in the display appears.
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Message Flag (flag 50). When set, the dispaly contains some message. When clear,
the display contains the default display (ALPHA- or X-register).
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SST Flag (flag 52). Flag 51 is used internally for single-line program
execution and always tests clear for you.
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Program Mode Flag (flag 52). Flag 52 is used to control PRGM mode. It always
tests clear for you.
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I/O Flag (flag 53). This flag is used to determine if some peripheral
extension is ready for I/O. When set, the extension is ready. When clear the device
is not ready for I/O activity.
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Pause Flag (flag 54). When flag 54 is set, a user program
PSE is in progress. When clear, a pause is not in progress.
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Printer Existence Flag (flag 55). This is used to indicate if the
standard HP-41C printer is attached to the HP-41C. When set, a printer is attached.
When clear, no printer is present. Flag 55 works in conjunction with the printer
enable flag (flag 21).
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