Reading and setting the time

[rwl7532]

I push data to hours, minutes, seconds and 10th seconds. The 6526 datasheet mentions "latched" until "The clock will not start again until after
a write to the 1Oths of seconds register."
I push data in BCD format to the four registers ($dd0b,a,9,8) but upon c@ retrieval from those four registers the data is static. Why?
Also I see some code referring to "include tod" Where is tod found? Looks handy.

[Whammo]

Ah, yes, that would be #335 "NMI TOD clock alarm interrupt"

TOD stuff is a little tricky. I think I worked most of it out.

[rwl7532]

Is the 6526 timer part of getting the TOD registers set and unlatched?
And hoping to get file referenced by "include tod"

[Whammo]

No, the timer registers are not involved with TOD.
Also the reference to include TOD was to what code is referenced by #335
Thank you for your interest in durexForth!

[Whammo]

If you are refering to:
Hacking the 'ok' prompt for a clock #386
It is quite outdated.
Or, perhaps something else?

[rwl7532]

Not specifically.
I did break the ask only one question rule!
First question was:
I push data in BCD format to the four registers ($dd0b,a,9,8) but upon c@ retrieval from those four registers the data is static. Why?

[Whammo]

I don't know, but if the code in #335 doesn't work for you, it's likely a hardware problem.
The registers should be written in this order:
hour min sec 10th
Also, make sure the alarm bit is not set.
0 $dd0f c! \ tod bit

[Whammo]

you can read the registers in any order, but you must read 10ths after reading hours, or the clock won't un-latch.

[Whammo]

Interesting. My TOD stuff has broken!
Ah, the march of progress.

[Whammo]

Programmers Reference Guide sez:
A specific sequence of events must be followed for proper setting and
reading of TOD. TOD is automatically stopped whenever a write to the
Hours register occurs. The clock will not start again until after a write
to the 10ths of seconds register. This assures TOD will always start at
the desired time. Since a carry from one stage to the next can occur at
any time with respect to a read operation, a latching function is
included to keep all Time Of Day information constant during a read
sequence. All four TOD registers latch on a read of Hours and remain
latched until after a read of 10ths of seconds. The TOD clock continues
to count when the output registers are latched. If only one register is
to be read, there is no carry problem and the register can be read "on
the fly," provided that any read of Hours is followed by a read of 10ths
of seconds to disable the latching.

[rwl7532]

I got it working! Thanks for your patience.
: setall dup >r set10s setsec setminute sethr r> set10s ;
2 32 25 4 setall

[Whammo]

I have also repaired #335 when durexForth defaulted to decimal it broke quite a few bits.