TransEra 641-RTC

The TransEra 641 Real Time Clock ROM Pack (641-RTC) is a ROM pack for the 4051 microcomputer.

Command set

Command	Description
CALL "TIMSET", T	Sets the actual time. T must be a floating point number containing the count of seconds + fractions since the 01-01 of the current year. The resolution is 1/128 of a second.
CALL "TIMSET",T$	Sets the actual date & time. T$ must be a string in the format "MM-DD-YY HH:MM:SS". The time must be always given in 24h format.
CALL "TIME",T	Returns the actual time. The result T is a floating point number and contains the count of seconds since 01-01 of the current year. The resolution is 1/128 of a second.
CALL "TIME",T$	Returns the actual date & time. T$ contains a string in the format "WEK MM DD YY HH:MM:SS [AM/PM]". The string is formatted depending on previous calls of 24HOUR or 12HOUR. Examples: MON 07 MAR 21 4:15:20 PM MON 07 MAR 21 16:15:20 Remark: As with all 4050 RTC modules the 641-RTC is not Y2K compatible. So in this example the weekday of march, 7th, 1921 is returned.
CALL "CLOCK",T$	Same as "TIME",T$ and "TIME",T
CALL "PAUSE",T	Pauses the Program for T seconds. The parameter T must be an integer value. The maximum delay is 65535 seconds (~18hours) After the pause the program execution starts at the next line.
CALL "TIMER",T,L	Starts an asynchronous timer with the delay T and jumps to line L when the timer is done. The maximum delay is 65535 seconds (~18hours). The timer is not retriggered automatically.
CALL "12HOUR"	Sets the format of the returned time strings to 12-hour format. This is the default time format after a power-cycle.
CALL "24HOUR"	Sets the format of the returned time strings to 24-hour format.

Revisions

At least 3 revisions were released. The first version came without a battery, so all time information was lost after a powercycle. The second revision added a battery for counting the seconds within the year. But the year information was still unprotected. The manual of the TransEra 741-RTC explicitly talks about a 741-RTC and a 641-RTC with identical command set. The command set in the manual differs from the command set of the units shown on this page. So a third hardware revision of the 641 should exist.