I'm still waiting for the Dallas chip, but I can build the prototype with that valuable information....

The only aspect I don't like of that Dallas chip is the ten years limit of the internal lithium cell...but always there is someone that has overcome the obsolescence of a particular item:

http://www.mcamafia.de/mcapage0/dsrework.htm

Here is the entire page just in case it would disappear:

Always obsolescence built out....

At last I've ended the RTC. Here are some pictures:

https://www.dropbox.com/s/o0hr6ai9q31fz4g/1.jpg
https://www.dropbox.com/s/xoaak4q6hbsl93k/2.jpg
https://www.dropbox.com/s/8efwxlo5t1g4y9d/3.jpg
https://www.dropbox.com/s/ojrrg3w2n34hiky/4.jpg
https://www.dropbox.com/s/q29ac94wdzxr2gd/5.jpg

Or inside a "RTC on a Microteam" directory inside the FTP ftp://ftp.enterpriseforever.com

No, I can`t. My Microteam EXDOS hangs the EP every few seconds. On the other hand I don`t know how to access it.

Have you read your private messages?

And the clock, does it react?

Will look later, now I'm away in the weekend but I am going to modify the ZT Clock for handling the different port addresses, and see what happening on Monday

Have you set up the clock? Seems that first you must put the oscilator to work, writting a 010 in bits 4,5 and 6(DV0,DV1,and DV2) of register A. Also you have to set bynary or BCD mode in all ten bytes of the calendar registers.

Good news!
Your clock card started working! Mostly

After everything virified at least 5 times, I changed the Pin 1 MOT from GND to VCC, from Intel mode to Motorola mode.
Then it is working! So the fault when I guess the Z80 (which are unofficial upgraded version of Intel 8080 and developed by ex-Intel engineers) need the Intel mode instead the Motorola

Anyway the original clock card don't use Pin 1.

Some problem left: the year randomly changed to E5h I think this is software problem, something different between the original Motorola and the new Dallas RTC chips.

I downloaded tons of datasheets for look what happened in the RTC market in the last 20 years...
Not exist any good comparison table about the MC146818 compatibles Hard work to dig out all informations.

Probably now I can understood the Dallas part numbers