Re: [CAD_CAM_EDM_DRO] Troubleshooting a BTR

On Sat, 7 Aug 2004 15:13:35 -0400, you wrote:

>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...

that's correct, the 8250 needs to be programmed, the 1013 can be
programmed by switches, that's what all the extra pins are for.

IIRC, there's going to be a baudrate generator on that, say a motorola
14411, for example. Look for a 1.8432 Mhz crystal, or a multiple of
that frequency, common baudrate use.

Harvey

>
>> 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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>OFF Topic POSTS: General Machining
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>http://www.metalworking.com/news_servers.html
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>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
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>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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