Faulty Microdisc?
- Silicebit.
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Faulty Microdisc?
Hi all!
I have two Microdisc and three Atmos. Recently I built a power supply for them, with one jack and two 4 pin DIN connectors (Microdisc style), the PS go out 7.5V 2A and 15V 1A. When I connect Atmos, Microdisc and PS, the Atmos don't boot, all I can see is a screen full of trash.
Photos here: http://www.retrowiki.es/e107_plugins/fo ... 16006.last in spanish only, sorry.
Please, can someone help me? I could solve the problem with ampli-bus perhaps?
Thanks in advance.
I have two Microdisc and three Atmos. Recently I built a power supply for them, with one jack and two 4 pin DIN connectors (Microdisc style), the PS go out 7.5V 2A and 15V 1A. When I connect Atmos, Microdisc and PS, the Atmos don't boot, all I can see is a screen full of trash.
Photos here: http://www.retrowiki.es/e107_plugins/fo ... 16006.last in spanish only, sorry.
Please, can someone help me? I could solve the problem with ampli-bus perhaps?
Thanks in advance.
Last edited by Silicebit. on Sun Mar 18, 2012 8:37 am, edited 1 time in total.
Oric user since 1984. YouTube
Re: Microdisc faulty?
I'm no expert but have you tried without the Atmos' PSU?
The Microdisc is supposed to power the Atmos thru the expansion port.
The Microdisc is supposed to power the Atmos thru the expansion port.
- Silicebit.
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Re: Microdisc faulty?
Thanks Symoon, for the fast reply.
Yes, i tried without the Atmos' PSU too and the Microdisc power the Atmos thru the expansion port, but same results. I forget to say that the two Microdisc don´t work on the three Atmos.
Yes, i tried without the Atmos' PSU too and the Microdisc power the Atmos thru the expansion port, but same results. I forget to say that the two Microdisc don´t work on the three Atmos.
Oric user since 1984. YouTube
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Re: Microdisc faulty?
Hi
I had problems when I rebuilt a couple of drives a few years back and steve marshall sorted me out so you could drop him an email ,from memory your dil switches look in the wrong position on your controller I maybe wrong but its worth a try on row 'A' mine had to be set to 1 on,2 off 3 off 4 off 5 on or off depending on version.
row 'B' 1 off ,2 on 3 off ,4 off others not used
maybe somone still with a drive could confirm this
I had problems when I rebuilt a couple of drives a few years back and steve marshall sorted me out so you could drop him an email ,from memory your dil switches look in the wrong position on your controller I maybe wrong but its worth a try on row 'A' mine had to be set to 1 on,2 off 3 off 4 off 5 on or off depending on version.
row 'B' 1 off ,2 on 3 off ,4 off others not used
maybe somone still with a drive could confirm this
ONLY DEAD FISH GO WITH THE FLOW
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Re: Microdisc faulty?
also what happens when you hit the red reset button on back of microdisc it should revert to atmos rom as opposed to microdisc
ONLY DEAD FISH GO WITH THE FLOW
- Silicebit.
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Re: Microdisc faulty?
Hi nobbysnuts!
When i press the reset button nothing happen, some times the pattern on screen change, other times no. I tested the flat cables and all ok, i think the problem can be with signal integrity (Phi2) and others, and a unshielded flat cable.
When i press the reset button nothing happen, some times the pattern on screen change, other times no. I tested the flat cables and all ok, i think the problem can be with signal integrity (Phi2) and others, and a unshielded flat cable.
Oric user since 1984. YouTube
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Re: Microdisc faulty?
I really don't like the hole that was made on the microdisk board to access the floppy jumpers...
My Projects: Replic'Oric Project - StratoCumulus Project
- Silicebit.
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Re: Microdisc faulty?
I think that is a good idea, you can change the number of drive without dismantle all Microdisc.
Oric user since 1984. YouTube
- Silicebit.
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Re: Microdisc faulty?
Hi!
In the article, Réalisez un contrôleur de disquettes pour votre Oric (type Microdisc) part 2/3, from Thierry Bestel, is mentioned a disquette issued quarterly with the Microdisc chronogrammes. Someone has the above mentioned disquette? Please, i'll be very grateful if the holder send me a private message.
Have a nice day.
In the article, Réalisez un contrôleur de disquettes pour votre Oric (type Microdisc) part 2/3, from Thierry Bestel, is mentioned a disquette issued quarterly with the Microdisc chronogrammes. Someone has the above mentioned disquette? Please, i'll be very grateful if the holder send me a private message.
Have a nice day.
Oric user since 1984. YouTube
- Silicebit.
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Re: Microdisc faulty?
Hi again!
A pics of Phi2 signal on my oscilloscope:
Output of IC5 pin 18 and input of IC20 pin 1.
Input of IC5 pin 2.
A pics of Phi2 signal on my oscilloscope:
Output of IC5 pin 18 and input of IC20 pin 1.
Input of IC5 pin 2.
Oric user since 1984. YouTube
Re: Microdisc faulty?
I did not realize that phpBB3 came with a built-in attach pictures feature. Cool
Re: Microdisc faulty?
the IC5 pin 2 signal has a strange shape.. Normally phi2 provides a square signal shape and a "pull up" resistor of 3.3k is there for that.
- Silicebit.
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Re: Microdisc faulty?
Trick, trick.Dbug wrote:I did not realize that phpBB3 came with a built-in attach pictures feature. Cool
Oric user since 1984. YouTube
- Silicebit.
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Re: Microdisc faulty?
The 3K3 pull up resistor is lost in my two Microdisc, i'll put them and i'll see the wave again. Also, the IC5 pin 2 signal has a level of, 3 squares * 2 volts per square = 6 Volts???? Mmmm strange.kenneth wrote:the IC5 pin 2 signal has a strange shape.. Normally phi2 provides a square signal shape and a "pull up" resistor of 3.3k is there for that.
Oric user since 1984. YouTube
Re: Microdisc faulty?
The voltage can go beyond 5v if there is a floating potential ( command by a transistor with an "open collector" ) and add a capacitor... the oscilloscope for example !