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Booting stops after 3 clicks....

Booting stops after 3 clicks....

2012-06-15 by hazchem88

This EII was working fine.....

recently,

only gets as far as clicking the drive 3 times then hangs.

Memory test floppy loads fine, and the memory test passes.

Diagnostic document says it could be something to do with memory register selection, check IC84 and support ICs.

Any other suggestions or tips?

thanks

Re: [emulatorII-list] Booting stops after 3 clicks....

2012-06-15 by Nigel Cruickshank

Swap the first row of digital memory for the last row.  You don't need to have the piggyback board attached to boot it.

I think the first 7 memory chips are the boot sequence chips.  Something like that.

If there is a problem with your boot memory that will flush it out.


On 15/06/2012, at 8:02 PM, hazchem88 wrote:

 



This EII was working fine.....

recently,

only gets as far as clicking the drive 3 times then hangs.

Memory test floppy loads fine, and the memory test passes.

Diagnostic document says it could be something to do with memory register selection, check IC84 and support ICs.

Any other suggestions or tips?

thanks


Re: Booting stops after 3 clicks....

2012-06-15 by hazchem88

yes I can try that, however, the memory test is all OK, so not convinced it will make a difference
thanks

--- In emulatorII-list@yahoogroups.com, Nigel Cruickshank <nigelc@...> wrote:
>
> Swap the first row of digital memory for the last row.  You don't need to have the piggyback board attached to boot it.
> 
> I think the first 7 memory chips are the boot sequence chips.  Something like that.
> 
> If there is a problem with your boot memory that will flush it out.
> 
> 
> On 15/06/2012, at 8:02 PM, hazchem88 wrote:
> 
> > 
> > 
> > This EII was working fine.....
> > 
> > recently,
> > 
> > only gets as far as clicking the drive 3 times then hangs.
> > 
> > Memory test floppy loads fine, and the memory test passes.
> > 
> > Diagnostic document says it could be something to do with memory register selection, check IC84 and support ICs.
> > 
> > Any other suggestions or tips?
> > 
> > thanks
> > 
> >
>

Re: [emulatorII-list] Re: Booting stops after 3 clicks....

2012-06-15 by Nigel Cruickshank

Well, it's a pretty easy test if you want to rule out the boot memory entirely.  You're right, if the memory came up as all good it's unlikely, but still it's an easy process to rule it out entirely.

I also had the same problem when my 5v rail was low and I adjusted a small trimpot on the power supply until it came back up to 5v.  My display was dimmer than usual also.


On 15/06/2012, at 8:50 PM, hazchem88 wrote:

 

yes I can try that, however, the memory test is all OK, so not convinced it will make a difference
thanks

--- In emulatorII-list@yahoogroups.com, Nigel Cruickshank <nigelc@...> wrote:
>
> Swap the first row of digital memory for the last row. You don't need to have the piggyback board attached to boot it.
>
> I think the first 7 memory chips are the boot sequence chips. Something like that.
>
> If there is a problem with your boot memory that will flush it out.
>
>
> On 15/06/2012, at 8:02 PM, hazchem88 wrote:
>
> >
> >
> > This EII was working fine.....
> >
> > recently,
> >
> > only gets as far as clicking the drive 3 times then hangs.
> >
> > Memory test floppy loads fine, and the memory test passes.
> >
> > Diagnostic document says it could be something to do with memory register selection, check IC84 and support ICs.
> >
> > Any other suggestions or tips?
> >
> > thanks
> >;
> >
>


Re: [emulatorII-list] Re: Booting stops after 3 clicks....

2012-06-15 by Nigel Cruickshank

Having though about it a little more I think you should verify that you do have 5v running to the floppy.  My Eii was working fine until one day I had trouble loading a disk and then after that it would fail to boot after a few clicks of the drive.  

I checked the 5v by inserting the multimeter pins into the disconnected floppy power connector. (I got the same reading at other points on the board and this seemed like an easy way to do it)

If you check your 5v and it is low get back to me and I will send a photo of which trimpot to adjust. If that's the case it may be a temporary fix as something is pulling the power supply down.

Lethal voltage runs through the power supply even when the unit is switched off so be careful.

Nigel


On 15/06/2012, at 8:50 PM, hazchem88 wrote:

 

yes I can try that, however, the memory test is all OK, so not convinced it will make a difference
thanks

--- In emulatorII-list@yahoogroups.com, Nigel Cruickshank wrote:
>
> Swap the first row of digital memory for the last row. You don't need to have the piggyback board attached to boot it.
>
> I think the first 7 memory chips are the boot sequence chips. Something like that.
>
> If there is a problem with your boot memory that will flush it out.
>
>;
> On 15/06/2012, at 8:02 PM, hazchem88 wrote:
>
> >
> >
> > This EII was working fine.....
> >
> > recently,
> >
> > only gets as far as clicking the drive 3 times then hangs.
> >
> > Memory test floppy loads fine, and the memory test passes.
> >
> > Diagnostic document says it could be something to do with memory register selection, check IC84 and support ICs.
> >
> >; Any other suggestions or tips?
> >
> > thanks
> >
> >
>