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Author Topic: Real Time Clock on a Microteam EXDOS (Read 9929 times)

Offline gflorez

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Real Time Clock on a Microteam EXDOS
« on: 2014.February.06. 02:10:48 »
Can this chip work in the EP?

I Remember I adapted it to my Amiga 500 copying the schematics from a Commodore 501 memory expansion.

It connects directly to the processors  data bus, not by serial bus.

I will look for the Amiga schematics.

Offline gflorez

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Re: Real Time Clock on a Microteam EXDOS
« Reply #1 on: 2014.February.06. 09:49:34 »
Here is my clumsy but functional project:


-----------------


Aquí esta mi torpe pero funcional proyecto:

Online Zozosoft

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Re: Real Time Clock on a Microteam EXDOS
« Reply #2 on: 2014.February.06. 10:03:00 »
Quote from: gflorez
Can this chip work in the EP?
It is possible, but exist a Clock Board for Enterprise.
It is use the 146818 (or compatibe) RTC chip, which are used millions of PC motherboards.
Schematic
Component placement.

In my ZozoTools included handler program for this card.

Offline gflorez

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Re: Real Time Clock on a Microteam EXDOS
« Reply #3 on: 2014.February.06. 10:25:52 »
Gyula Mészáros seems like God, he is in almost all interesting projects of that old time...


On the othe side today you are like JC..........


--------------

Gyula Mészáros parece Dios, está en casi todos los proyectos interesantes de aquellos viejos  tiempos...

Pero hoy en día tú eres como JC..........

Offline gflorez

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Re: Real Time Clock on a Microteam EXDOS
« Reply #4 on: 2014.February.06. 10:46:02 »
However, note that the official Amiga clock has fewer components.

Only three resistors, three capacitors, two diodes, a variable capacitor, a crystal, the battery and finally the chip.

It also uses only four lines of the address bus and four data bus, RD and WR, 0v and 5V.

Even I was surprised when I saw my "bad copy" working....

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De todas formas, observa que el reloj oficial de Amiga tiene muchos menos componentes.

Solo tres resistencias, tres condensadores, dos diodos, un condensador variable, un cristal, la batería y por último el chip.

También utiliza solo cuatro lineas del bus de direcciones y otras cuatro del bus de datos, RD y WR, 0v y 5vcc.

Hasta yo me sorprendí cuando vi que mi "mala copia"me funcionaba....

Offline gflorez

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Re: Real Time Clock on a Microteam EXDOS
« Reply #5 on: 2014.February.06. 10:54:41 »
That little expansion port at the side of the Microteam EXDOS card, can it be for a RTC?

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Ese pequeño puerto de expansión a un lado de la tarjeta EXDOS de Microteam, ¿puede ser para un Reloj en Tiempo Real?

Online Zozosoft

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Re: Real Time Clock on a Microteam EXDOS
« Reply #6 on: 2014.February.06. 10:57:07 »
Quote from: gflorez
However, note that the official Amiga clock has fewer components.
Yes, but I'm sure it is connecting for any predecoded port in the Amiga. If you want to build this to Enterprise also need to add address decoding circuits (U3,4,5).

If the expansion connector on your card have a +5V (at pin A4/B4) then the 7805 circuit not needed.

Online Zozosoft

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Re: Real Time Clock on a Microteam EXDOS
« Reply #7 on: 2014.February.06. 11:00:59 »
Quote from: gflorez
That little expansion port at the side of the Microteam EXDOS card, can it be for a RTC?

Do you think at the other side as the machine connection?

Online Zozosoft

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Re: Real Time Clock on a Microteam EXDOS
« Reply #8 on: 2014.February.06. 11:28:06 »
Quote from: Zozosoft
Do you think at the other side as the machine connection?
If yes then possible but currently nobody try it :-)
It is have a predecoded port signal and also +5V. You can omit many components of the original card.
It is at different I/O address but I can modify the clock program for you.

Offline gflorez

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Re: Real Time Clock on a Microteam EXDOS
« Reply #9 on: 2014.February.06. 11:49:40 »
Yes, that 13+13 pins.



Okay, but first I have to finish the current project (EPROM / SRAM), only was just curious. Later I'll remind you.


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Si ese puerto de 13+13 pines.



Bueno, pero antes tengo que terminar el proyecto actual(EPROM/SRAM), solo era curiosidad. Mas adelante ya te lo recordaré.

Offline gflorez

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Re: Real Time Clock on a Microteam EXDOS
« Reply #10 on: 2014.February.10. 16:14:13 »
That Microteam expansion port is ideal for the RTC, as I can easily weld pins and do a insertable little card, horizontal over the EXDOS card, occupying very little space....


It appears to  have all the necessary signals, except +9v but it can be taken from the EP edge connector.


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Ese puerto de expansión de la Tarjeta Microteam es ideal para el Reloj en Tiempo Real, ya que puedo soldar fácilmente pines y crear una pequeña placa insertable horizontalmente encima de la tarjeta EXDOS, ocupando muy poco espacio.... 


Parece que están presentes todas las señales necesarias, menos +9v, pero puede traerse del conector de expansión del EP.

Offline gflorez

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Re: Real Time Clock on a Microteam EXDOS
« Reply #11 on: 2014.February.10. 16:37:26 »
Please change topic to "Real Time Clock on a Microteam EXDOS", please.

Online Zozosoft

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Re: Real Time Clock on a Microteam EXDOS
« Reply #12 on: 2014.February.10. 16:40:27 »
Done.

Offline gflorez

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Re: Real Time Clock on a Microteam EXDOS
« Reply #13 on: 2014.February.10. 18:05:01 »
One more favour please. Can you make a scheme with all components and wires, something easy that an "Ic breaker" could follow?(while I wait...)

The diagram you brought is full of corrections, and is confusing.
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Te agradecería un favor mas. ¿Puedes hacer un esquema con todos los componentes y conexiones, algo fácil que un "rompe Integrados" pueda seguir?(mientras espero...)

Es que el diagrama que mostraste está lleno de correcciones y es confuso.
« Last Edit: 2014.February.10. 18:11:56 by gflorez »

Offline gflorez

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Re: Real Time Clock on a Microteam EXDOS
« Reply #14 on: 2014.February.14. 00:49:10 »
And, how about this?

isn`t it simpler?