Re: [CAD_CAM_EDM_DRO] Troubleshooting a BTR

On Saturday 07 August 2004 02:57 pm, Alan Marconett wrote:

> Hi Steve, list,
>
> Might be older then 8250. How about the old AY5-1013? What was the
> year of the controller?

This would make sense if there was no CPU, as an 8250, etc. has registers
that need to be set up while that one you mention is settable by way of DIP
switches, if I'm remembering right...

> Alan KM6VV
>
> Stephen Wille Padnos wrote:
> > Jon Elson wrote:
> >>vinnygenovese wrote:
> >>>I am trying to bring an IKEGIA FX25-N / Fanuc 5T back to life. There is
> >>> a BTR that I am trying to bring online. Problem is I don't have any
> >>> instructions or dip switch settings. I uploaded a photo to
> >>> http://radiantheat.com/UCM-BTR.jpg. The board has a single LED , which
> >>> seems to 'blink' when i send data, but it seems no signal gets through
> >>> to the Fanuc 5T. (or I am sending the wrong commands). I googled and
> >>> googled. It seems they are out of business. Any hints on the dip
> >>> switch's or other hints would be very welcome.
> >>
> >>Well, I think it can be deciphered. It looks like there is no
> >>microprocessor there,
> >>I think the big chip is a 40-pin UART. It also looks like the markings
> >>have been
> >>sanded off that chip, but by tracing the power pins, you may be able to
> >>figure
> >>out which if the several 40 pin uarts it is. It is socketed, so pulling
> >>it and
> >>looking on the back may have some markings that at least identify the
> >>manufacturer,
> >>which may be all you need to narrow down the type of UART. Once you
> >>know this,
> >>you can see which dip switch is connected to which pin, and with the
> >>crystal frequency,
> >>you can figure out how to set the baud rate and transmission
> >> characteristics (# bits, even/odd/none parity, etc.)
> >>
> >>I could be off on this, but there is clearly no EPROM chip, and
> >>something about
> >>it just makes me think it predates one-chip micros. I note 1488 and
> >>1489 chips,
> >>and wonder if it is getting the right power to those chips, as they need
> >>both
> >>positive and negative voltages.
> >>
> >>I don't know Fanuc machines, but most systems need some switch settings
> >>and/or
> >>commands or buttons to put them in the right mode to read a program from
> >>tape
> >>or to go into DNC mode.
> >>
> >>In DNC mode, the computer becomes a file server for the CNC control, and
> >>doesn't send anything until the CNC control asks for it by file name.
> >>
> >>Jon
> >
> > Hmmm.
> >
> > I think the large chip actually is a microcontroller. The 8051 has been
> > around forever, as have the precursors to PIC line. The tipoff is that
> > the crystal isn't an oscillator, but a resonator. (also, there's no
> > reason to sand off the markings on a UART) According to this pinout (in
> > ascii art :) http://www.xs4all.nl/~ganswijk/chipdir/giicm/8250.txt , the
> > 8250 (which it almost certainly would have been) takes a single clock
> > input - like that from a clock oscillator. Also, the clock input is on
> > pin 9, not pins 38+39 as this one.
> >
> > Of course, it's not an 8051 either, since the crystal connects to pins
> > 18+19 (unless the chip is rotated). I checked the Z80, and that's not
> > it either.
> >
> > I don't remember any UARTs that weren't compatible with the 8250, though
> > they could certainly have existed anyway.
> >
> > If you could post a higher resolution photo, as well as any information
> > on the underside of the large chip, that may help. Also, what
> > diagnostic tools do you have available? (do you have a scope?)
> >
> > - Steve
>
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