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TIMEWISE 798A RALLY COMPUTER $10.00
© TIMEWISE 32 Old Barn Road Hawthorn Woods, Illinois 60047
(847) 550-5052
Part Number 1001798A Rev 4.008
All Rights Reserved
Printed June 1, 2005
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TIMEWISE
798A
RALLY
COMPUTER
USERS MANUAL
TIMEWISE
798A
SPLIT
LAST CAST
RESET
TIME
ODO AUXILIARY
CLOCK
CALCULATED TIME
Log
SHIFT
FORWARD
PARK
REVERSE
CAST
TRUNCATE
Reset
Intelli-CAST ODOMETER
SPEED
NEXT SPEED
AUXILIARY
ERROR
Clock
Odo Check
Alarm
Odometer
Factor
Preset

*
Odo & Time
Next Speed
Last Split
Adjust
ORM
Transit
Calc Time
*
Shift

CAST to load
.10
+ Remote Brightness
Brightness
Remote Aux
Odo Input
10.00
+ Error Format
.01
+ Time Format
Intelli-CAST
1.00
+ Input
÷
Ratio
.001
Speed Format
Odo Format
+ Set / Sync
To Go
A

B
Calc Speed
Speed
Compute Factor
Print
FIRMWARE VERSION HISTORY
TIMEWISE 798A
i
798A Operating Firmware History
Version 1.000beta October 18, 1999
Initial release for approval by outside testers.
Version 1.000
November 23, 1999
Finalized speedometer, auto-factor, and datalog firmware. Also added transducer Intelli-Sense capabilities.
First product delivered.
Version 1.001
December 14, 1999
Added new feature: The
SPLIT
and
PARK/REVERSE
alarm beep lengths are now adjustable. The 798A now
exceeds initial specifications.
Version 1.002
December 20, 1999
Added new drivers remote auxiliary selection: The
TIME

ODO
switch can be used to select among the
auxiliary calculated time, main odometer, or auxiliary odometer for the remote display.
Version 1.003
December 22, 1999
Corrected a speedometer calculation problem when the transducer pulse rate exceeded 107 pulses/sec (>150
mph in a typical magnet sensing application). The 798A speedometer now correctly displays speeds at
transducer input pulse rates up to 250 pulses/sec.
Version 1.004
January 7, 2000
The
Load
function is no longer automatically disabled following a power-off condition. Similarly, once the
Intelli-Sense system is armed (by changing odometer inputs), the system remains armed following a power-
off condition. Previously, the
Load
function and the Intelli-Sense system had to be re-enabled following any
power outage.
Also eliminated potential false transducer failure indications from occurring while making adjustments to the
odometer factors.
Version 1.005
February 7, 2000
Changed the automatic LED display brightness level setting that occurs upon wake-up from idle mode. The
main unit LEDs now re-illuminate at their mid-point if they were set to less than half the maximum brightness
when the 798A entered the idle mode. The drivers module always re-illuminates at its prior setting.
Version 1.006
February 11, 2000
The power failure and odometer alarm visual notifications (showing in the
CLOCK
display) can now be
dismissed by turning the rotary switch or actuating any toggle switch. Previously, only an actuation of the
SHIFT
switch dismissed the warnings.
Version 2.000
June 1, 2000
Added ability to execute the
Calc Factor
function without inserting the calculated value into the active factor.
Thus, you can have the 798A compute a sample factor.
On units outfitted with the datalog option, the user may select whether the speed stored is the changed to, or
the changed from CAST value. The selection can be made while turning on the instrument. Also added eight FIRMWARE VERSION HISTORY
ii
TIMEWISE 798A
additional datalog memories (for a total of 56), and fixed a bug that prevented viewing some data in the log
when the sequence number re-started after reaching 250.
Now offer Option 6 allowing users to set CASTs with .01 mph resolution
Version 2.001
June 27, 2000
Fixed a firmware bug that occasionally prevented a speedometer reading of 0.0 [mph] from being shown in the
drivers
AUXILIARY
display.
Version 2.002
July 18, 2000
Fixed a bug that prevented setting the hundredths digit of the
Preset
calculated time. Also corrected the
truncation of the calculated time tenths of units digit when a preset
Load
was executed after changing the time
counting mode.
Added new datalog review option that advances to the next newer data set following each logging action.
Previously the data set being viewed remained unchanged following each logging action, such as does a multi-
split checkpoint clock (where a first to last review of logged data is required). The 798A can now also
function as a datalogger where a last to first review of logged data is expected.
Modified the display of logged calculated time and clock data to always show tenths of units, regardless of the
selected time resolution mode for live or split data.
Increased the settable
Alarm
resolution to 0.01 mile. Previously, the resolution was 0.1 mile.
Added ability to continuously display an alarm countdown distance in the main
AUXILIARY
display without
holding down the
SHIFT
switch. Also added ability to display the countdown distance in drivers
AUXILIARY
display.
Changed the alarm
To Go
function to allow setting of an alarm warning distance. The
To Go
distance can
range from 0.00 to 9.99 miles. Adjusting the
To Go
distance to a value other than 0.00 causes the beeper to
sound at the selected distance prior to arriving at the alarm mileage. Previously, the alarm beeper could only
sound at the alarm mileage. (Also previously, the
To Go
function simply served to temporarily display the alarm
countdown distance in the
AUXILIARY
display.)
Altered the drivers module LED display circuitry re-initialization procedure to also include a re-initialization of
the main LED display circuitry. The re-initialization procedure now requires a two second
Last Split
activation
rather than simply a two second
SHIFT
switch activation.
Version 2.003
August 18, 2000
Eliminated illumination of the thousandths of miles digit of an
Odo & Time
adjustment amount (in the
AUXILIARY
display) when thousandths of miles are not displayed in the main odometer.
The log sequence number now counts to 255 before re-starting at 1. Previously the sequence number counted to
250.
Also, you can now enter a
Preset
CAST using .01 mph resolution when Option 6 is installed.
Version 2.004
August 21, 2000
Implemented a flashing
ODOMETER
display when the
Remote

Park
function is activated.
FIRMWARE VERSION HISTORY
TIMEWISE 798A
iii
Version 2.005
September 7, 2000
Added an elective
ERROR
display offset of 0.45 second (or 0.45 hundredth). Some rallyists enable this offset to
make it easier to arrive at a checkpoint within the count intended by the rallymaster.
Version 3.000
October 29, 2000
Fixed a bug that prevented the factors associated with the inactive odometer input from being corrected during
the
Compute Factor
procedure if a sample factor was calculated first.
Added a visual warning that indicates when the odometer pulse rate is too fast (> 1000 pulses/second).
Improved the Intelli-Sense transducer failure detection system.
Changed the
AUXILIARY
display to allow showing tenths of units when viewing a time parameter.
Fixed an interrupt conflict introduced in version 2.002 that randomly produced a speedometer miscalculation.
Version 3.001
December 29, 2000
Fixed a bug introduced in version 3.000 that prevented electronic synchronization to Timewise multi-split
chronometers.
Changed the odometer pulse interrupt routine to allow an increase in the permissible odometer pulse rate.
Continuous odometer pulse rates in excess of 5000 pulses/second are now tolerated, even without use of the
798A's built-in input signal divider. The visual warning indicating an overly rapid odometer pulse rate now
occurs at rates in excess of 5000 pulses/second. (Pulse rates up to 640,000 pulses/second are allowed when
using the input signal divider.)
Also raised the speedometer timing routine to a higher interrupt priority. This guarantees the accuracy of the
speedometer calculation at extremely high speeds (>180 mph).
Version 3.002
January 3, 2001
Negative
Odo & Time
adjustment amounts (shown in the
AUXILIARY
display) are now displayed with a
negative sign preceding the value. Previously, a negative adjustment amount was shown as a number decreasing
from 1000.000 (e.g., a 0.100 mile adjustment was shown as 999.900).
Version 3.003
February 22, 2001
Option 3 is now available.
Version 4.000
April 2, 2001
Fixed a bug that caused two problems with the use of the Last CAST odometer adjustment feature:
After exiting a transit zone (i.e., where the CAST had been 0.0 mph), any adjustment to the Last CAST
odometer reading resulted in an incorrectly displayed value of the updated last CAST calculated time reading.
This was a display anomaly only. The actual driving time error and the overall calculated time were not
compromised.
Secondly, if the Intelli-CAST mode had been active upon a CAST change, the 798A saved the previous CAST
(required if the Last CAST feature is applied) at a value 0.08 mph higher than the actual previous speed. As a
result, Last CAST odometer reading adjustment