Re: DAC80 Replacement

It's the same schematic that has been on Spies for years!

There seems to be two different boards photographed here. One using
DAC80's and one using 1280's. The schematic is for 1280's.

Cheers
Paul

On Thursday, October 17, 2002, at 10:59 AM, Marc Alexander wrote:

> ----- Original Message -----
>> From: "Zonn" <zonn@zonn.com>
>> OK! OK! I'll stop with the geek talk! Now that I have caused
>> everyone's eyes to
>> glaze over...
>
> I like it! :)
>
>> (Don't take that too seriously, my two partners in crime's eyes also
>> glaze over
>> when I start talking vector generator theory. I can be a bit
>> obsessive at
>> times. ;-)
>
> Vector generator theory is what we're all here for, at least some of
> the time :)
>
> This makes me think about something I heard a long time ago and I'm not
> sure
> it's true:
> I heard that the main CRT display units in a Boeing 747-400 for example
> (or was it another relatively modern aircraft?), are
> basically vector scan monitors with such a high bandwidth that they can
> do both
> raster and vector scan, and change between a full vector-draw mode and
> raster scan mode depending on what screen they are displaying.
> I've seen some first hand myself and the picture is so good it's hard
> to tell,
> even in the some of the modes that appear vector-drawn. But it was a
> while ago.
>
> So do these dream vector monitors exist, and what from?
> Any other comments? :)
>
>
>> As far as the DAC's are concerned, I've never looked for a replacement
>> before,
>> but now that I have I ran across the DAC811 and DAC813 on TI's website
>> (they
>> bought Burr Brown). It looks like these DACs could replace the DAC80
>> on the
>> Cinematronics board. The pinout is different (it has more pins), and
>> some
>> resistor changes would need to be made on the Cine monitor to get the
>> offsets
>> and gains right. But at first glance it looks like one of these (if
>> not both)
>> could be made to work as a DAC80 substitutes. Each one has it's
>> advantage and
>> disadvantages. But by holding low the WR, LDAC, and NA, NB, NC, LMSB
>> and LLSB
>> lines, the data lines are passed directly through to the DAC, making
>> it act like
>> the DAC80.
>>
>> I think either of these could be made to work (or at least one of
>> them), as
>> either replacements for the DAC80 (with a daughter board, and some
>> component
>> value changes on the Cine monitor board), or in a Cine->WG convertor
>> board.
>
> Thanks for doing this work to find the right parts, please let us know
> what
> else you find out. I may be able to get sample qty's (1-3) from a
> distributor
> here for testing when it's needed.
>
>> So Marc, do you have a schematic of the Cine->WG board? I have some
>> hand
>> written stuff I've reverse engineered, but I haven't seen a full
>> schematic.
>
> Oh I just looked at it and it turns out it is the stand-alone Space
> Fortress DAC section that
> Paul emailed me (still does the same job), I'll email it to you
> off-list.
>
> Cheers,
>
> Marc
>
>
>
>> On Wed, 16 Oct 2002 19:38:45 +1000, "Marc Alexander"
>> <marcwolf123@yahoo.com>
>> wrote:
>>
>>>
>>> I really shouldn't be back into an OT post, sorry all :)
>>> I'm sure there's a setting in there somewhere to translate tech! :)
>>>
>>> Vector relation:
>>> BabelFish
>>>> Hitch Hikers Guide To The Galaxy
>>>> Vector graphics used on HHGTTG display unit,
>>> some of the most extensive and entertaining
>>> vector graphics used in a show :)
>>> http://www.bbc.co.uk/cult/hitchhikers/
>>>
>>> BTW if someone can supply a suitable DAC part number that
>>> will replace the old DAC80 (DAC1280?), I have already put myself down
>>> with
>>> Paul to do the schematics and pcb layout of a new adapter,
>>> and Paul will make the first prototype on veroboard and test it.
>>> (I can hear Paul groaning now ;) )
>>>
>>> Can anyone with extensive vec gen knowledge (Zonn? :) ) pick
>>> a suitable DAC that could go in to replace the DAC80 (DAC1280)
>>> listed on the old Cine>WG circuit?
>>> Let me know if you need the old Cine>WG circuit pdf file.
>>>
>>> (IMO, US$11 is not so bad for low qty's of a 12 bit DAC)
>>>
>>> Cheers,
>>>
>>> Marc
>>>
>>>
>>> One of my favourite quotes:
>>>
>>> Arthur Dent looks up "Earth" in the Hitchhiker's Guide
>>> Arthur Dent: What's it say? "Harmless." Just one word? *Harmless?*
>>>
>>> Announcer: Far out in the uncharted backwaters of the unfashionable
>>> end of the western spiral arm of the galaxy lies a small,
>>> unregarded yellow sun. Orbiting this at a distance of roughly 92
>>> million miles is an utterly insignificant little blue-green
> planet
>>> whose ape-descended life forms are so amazingly primitive that they
>>> still think digital watches are a really neat idea.
>
>
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Received on Thu Oct 17 00:47:58 2002