TransEra 641-RTC: Difference between revisions

Revision as of 06:44, 1 May 2022

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

Command set

Command	Rev 1	Rev 2	Description
CALL "TIMSET", T	yes	yes	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$	yes	yes	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	yes	yes	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$	yes	yes	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$	no	yes	Same as "TIME",T$ and "TIME",T
CALL "PAUSE",T	yes	yes	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	yes	yes	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"	no	yes	Sets the format of the returned time strings to 12-hour format. This is the default time format after a power-cycle.
CALL "24HOUR"	no	yes	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.

Pictures revision 1

Label view
Top view of PCB
Bottom view of PCB

Pictures revision 2

Label view - Note: The first "TIMSET"-CALL is misspelled.
Front view
Top view of PCB
Bottom view of PCB
Schematic of revision 2

Pictures revision 3

Firmware (uploaded BIN files)

File	Description
TransEra-641-RTC-1978.bin (?)	Original Firmware revision 1978
TransEra-641-RTC-1984.bin (?)	Original Firmware revision 1984
TE-rtc-641_y2k.bin (?)	Modified 1984 Firmware for Y2k compatibility

@@ Line 12: / Line 12: @@
 |-
 ! CALL "TIMSET", T
-! yes
+| yes
-! yes
+| yes
 | 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.<br/>The resolution is 1/128 of a second.
 |-
 ! CALL "TIMSET",T$
-! yes
+| yes
-! yes
+| yes
 | Sets the actual date & time. T$ must be a string in the format "MM-DD-YY HH:MM:SS".<br/>The time must be always given in 24h format.
 |-
 ! CALL "TIME",T
-! yes
+| yes
-! yes
+| yes
 | 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.<br/>The resolution is 1/128 of a second.
 |-
 ! CALL "TIME",T$
-! yes
+| yes
-! yes
+| yes
 | Returns the actual date & time. T$ contains a string in the format "WEK MM DD YY HH:MM:SS [AM/PM]".<br/>The string is formatted depending on previous calls of 24HOUR or 12HOUR.<br/>Examples:<br/>MON 07 MAR 21 4:15:20 PM<br/>MON 07 MAR 21 16:15:20<br/>Remark:<br/>As with all 4050 RTC modules the 641-RTC is not [[Year 2000 problem|Y2K]] compatible. So in this example the weekday of march, 7th, 1921 is returned.
 |-
 ! CALL "CLOCK",T$
-! no
+| no
-! yes
+| yes
 | Same as "TIME",T$ and "TIME",T
 |-
 ! CALL "PAUSE",T
-! yes
+| yes
-! yes
+| yes
 | Pauses the Program for T seconds. The parameter T must be an integer value.<br/>The maximum delay is 65535 seconds (~18hours)<br/>After the pause the program execution starts at the next line.
 |-
 ! CALL "TIMER",T,L
-! yes
+| yes
-! yes
+| yes
 | Starts an asynchronous timer with the delay T and jumps to line L when the timer is done.<br/>The maximum delay is 65535 seconds (~18hours).<br/>The timer is not retriggered automatically.
 |-
 ! CALL "12HOUR"
-! no
+| no
-! yes
+| yes
 | Sets the format of the returned time strings to 12-hour format.<br/>This is the default time format after a power-cycle.
 |-
 ! CALL "24HOUR"
-! no
+| no
-! yes
+| yes
 | Sets the format of the returned time strings to 24-hour format.
 |}