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Author Topic: Real Time Clock on a Microteam EXDOS (Read 10164 times)

Online gflorez

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Re: Real Time Clock on a Microteam EXDOS
« Reply #30 on: 2014.March.07. 18:41:39 »
I'm still waiting for the Dallas chip, but I can build the prototype with that valuable information....

Offline Zozosoft

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Re: Real Time Clock on a Microteam EXDOS
« Reply #31 on: 2014.March.07. 18:55:34 »
Quote from: gflorez
And A0-A7 is no more needed?
Yes.

Online gflorez

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Re: Real Time Clock on a Microteam EXDOS
« Reply #32 on: 2014.March.11. 14:00:33 »
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....
« Last Edit: 2014.March.11. 15:01:14 by gflorez »

Offline Zozosoft

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Re: Real Time Clock on a Microteam EXDOS
« Reply #33 on: 2014.March.11. 14:37:52 »
I have a least 20 years old Dallas chip, will try to rework it.

Online gflorez

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« Last Edit: 2014.March.13. 23:14:16 by gflorez »

Offline Zozosoft

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Re: Real Time Clock on a Microteam EXDOS
« Reply #35 on: 2014.March.13. 19:47:11 »
Very nice! Do you tested it?

Online gflorez

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Re: Real Time Clock on a Microteam EXDOS
« Reply #36 on: 2014.March.13. 23:05:03 »
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?

Offline Zozosoft

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Re: Real Time Clock on a Microteam EXDOS
« Reply #37 on: 2014.March.13. 23:21:07 »
Quote from: gflorez
No, I can`t. My Microteam EXDOS hangs the EP every few seconds.
Ok, I will look at what happened.

Quote
On the other hand I don`t know how to access it.
It is possible from BASIC with IN and OUT commands.
But a working machine is needed :oops:

Quote
Have you read your private messages?
Yes, and I'm wrote my work address to you.
« Last Edit: 2014.March.17. 14:32:35 by szipucsu »

Offline Zozosoft

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Re: Real Time Clock on a Microteam EXDOS
« Reply #38 on: 2014.March.21. 10:54:01 »
Quote from: gflorez
And the clock, does it react?
Will look later, now I'm away in the weekend :oops: but I am going to modify the ZT Clock for handling the different port addresses, and see what happening on Monday :-)
« Last Edit: 2014.March.21. 19:38:40 by szipucsu »

Offline Zozosoft

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Re: Real Time Clock on a Microteam EXDOS
« Reply #39 on: 2014.March.24. 20:14:40 »
Now tried your clock circuit, the system randomly freeze if it is attached :-( and also can't be detected.

With original clock card (form Gyula Mészáros) working fine.

Now thinking what is the problem...
« Last Edit: 2014.March.24. 20:30:01 by Zozosoft »

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Re: Real Time Clock on a Microteam EXDOS
« Reply #40 on: 2014.March.25. 08:24:15 »
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.

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Re: Real Time Clock on a Microteam EXDOS
« Reply #41 on: 2014.March.25. 08:27:45 »
Oh sorry, if you can`t acccess it you can`t write at all.....
« Last Edit: 2014.March.25. 23:35:59 by gflorez »

Offline Zozosoft

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Re: Real Time Clock on a Microteam EXDOS
« Reply #42 on: 2014.November.07. 00:06:28 »
Good news!
Your clock card started working! Mostly :oops:

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 :oops:

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.

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Re: Real Time Clock on a Microteam EXDOS
« Reply #43 on: 2014.November.07. 01:04:50 »
Motorola then....like the Amiga...

You are a genius...

Offline Zozosoft

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Re: Real Time Clock on a Microteam EXDOS
« Reply #44 on: 2014.November.09. 00:59:50 »
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 :evil: Hard work to dig out all informations.

Probably now I can understood the Dallas part numbers :oops: