girzong@infonode.ingr.com (Gary Girzon) (11/01/90)
does anyone know a good source for the 3.12 MHZ crystal required with the SP0256? also, will a standard colorburst (3.58 MHZ) crystal work, perhaps with a higher pitch? -- Gary Girzon ...!uunet!ingr!optron!gary!gary Optronics, An Intergraph Division (508) 256-4511 x8691
gja@mullian.ee.mu.oz.au (Grenville Armitage) (11/01/90)
In article <1990Oct31.232018.24991@infonode.ingr.com> girzong@infonode.ingr.com (Gary Girzon) writes: > >does anyone know a good source for the 3.12 MHZ crystal required with >the SP0256? also, will a standard colorburst (3.58 MHZ) crystal work, >perhaps with a higher pitch? Quite a number of years ago I used this chip without a crystal. An oscillator based on a TTL monostable chip was used to provide the clock, instead. Just a thought to let you know alternatives can be used.... gja
ardai@teda.UUCP (Mike Ardai) (11/02/90)
In article <1990Oct31.232018.24991@infonode.ingr.com> girzong@infonode.ingr.com (Gary Girzon) writes:
-does anyone know a good source for the 3.12 MHZ crystal required with
-the SP0256? also, will a standard colorburst (3.58 MHZ) crystal work,
-perhaps with a higher pitch?
A colorburst crystal will work fine with the spo256. In fact, I have never
heard one with a 3.12 MHz xtal; everyone uses 3.579. The CTS256 must be used
with a 10 MHz xtal, since it derives the baud rate from it.
/mike
--
\|/ Michael L. Ardai Teradyne EDA East
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/|\ ...!sun!teda!ardai (preferred) or ardai@bu-pub.bu.edurtaylor@hpdmd48.boi.hp.com (Rich Taylor) (11/02/90)
> does anyone know a good source for the 3.12 MHZ crystal required with > the SP0256? also, will a standard colorburst (3.58 MHZ) crystal work, > perhaps with a higher pitch? I have had good luck using approximate frequency crystals. The pitch does change. 3.58MHz may be too high, however. Rich Taylor rtaylor@hpdmd48.hp.com
usevitch@s24.csrd.uiuc.edu (Bryan Usevitch) (11/02/90)
girzong@infonode.ingr.com (Gary Girzon) writes: >does anyone know a good source for the 3.12 MHZ crystal required with >the SP0256? also, will a standard colorburst (3.58 MHZ) crystal work, >perhaps with a higher pitch? I was a teaching assistant for a group of students that built a speech synthesis board around this device. They used different crystals for different effects (such as male and female voices) with good success. I am not sure if they had to modify the digital timings of the circuit to compensate for the different crystal values but as I remember they simply swapped crystal values.
ce1zzes@prism.gatech.EDU (Eric Sheppard) (11/02/90)
In article <1990Oct31.232018.24991@infonode.ingr.com>, girzong@infonode.ingr.com (Gary Girzon) writes: > > does anyone know a good source for the 3.12 MHZ crystal required with > the SP0256? also, will a standard colorburst (3.58 MHZ) crystal work, > perhaps with a higher pitch? Just about any crystal about 3Mhz will do. It merely changes the pitch of the voice. Eric -- Eric Sheppard Georgia Tech | "Of course the US Constitution isn't Atlanta, GA | perfect; but it's a lot better than what ARPA: ce1zzes@prism.gatech.edu | we have now." -Unknown uucp: ...!{allegra,amd,hplabs,seismo,ut-ngp}!gatech!prism!ce1zzes
davec@maxwell.Concordia.CA ( DAVE CHU ) (11/02/90)
In article <1990Oct31.232018.24991@infonode.ingr.com> girzong@infonode.ingr.com (Gary Girzon) writes: > >does anyone know a good source for the 3.12 MHZ crystal required with >the SP0256? also, will a standard colorburst (3.58 MHZ) crystal work, >perhaps with a higher pitch? >-- >Gary Girzon ...!uunet!ingr!optron!gary!gary >Optronics, An Intergraph Division (508) 256-4511 x8691 I've used this chip before for a project, and found that the colorburst crystal works just as well as the 3.12MHz crystal. It does produce a higher pitch and I did not experienced any timming problem with the higher clock rate. Hope this helps, bye. davec@maxwell.concordia.ca davec@davinci.concordia.ca
chris@wasat.la.locus.com (Chris Davis) (11/02/90)
In article <1990Oct31.232018.24991@infonode.ingr.com> girzong@infonode.ingr.com (Gary Girzon) writes: >does anyone know a good source for the 3.12 MHZ crystal required with >the SP0256? also, will a standard colorburst (3.58 MHZ) crystal work, >perhaps with a higher pitch? yes, it will work, with a corresspondingly higher pitch. i have successfully used a 3.58 MHz tv colorburst crystal with this chip. a 4.00 MHz crystal worked fine too, but was a little too high pitched. the particular sp0256 i was experimenting with ran with a 6.00 Mhz crystal, though i doubt if they all would. __ __ o __ | |__| |__| | |__ Chris J. Davis chris@locus.com {uunet,ucla-se}!lcc!chris |__ | | | \ | ___| (213) 337-5951 Disclaimer? All my articles are forgeries "Flying a plane is no different than riding a bicycle, just a lot harder to put baseball cards in the spokes" - Captain Kramer, TransAmerican Airlines
gomez@speedway2.DAB.GE.COM (Frank Gomez) (11/04/90)
A good source for 3.12MHz clk is B.G. Micro which is advertise in Radio Electronics. Also a 3.57MHz will work.
umapu02@cc.ic.ac.uk (D.A.G. Gillies Supvsr Dr K.J. Bignell) (11/07/90)
In article <1990Nov1.211506.6670@csrd.uiuc.edu> usevitch@s24.csrd.uiuc.edu (Bryan Usevitch) writes: >girzong@infonode.ingr.com (Gary Girzon) writes: > > >>does anyone know a good source for the 3.12 MHZ crystal required with >>the SP0256? also, will a standard colorburst (3.58 MHZ) crystal work, >>perhaps with a higher pitch? > >I was a teaching assistant for a group of students that built a speech >synthesis board around this device. They used different crystals for >different effects (such as male and female voices) with good success. I am >not sure if they had to modify the digital timings of the circuit to >compensate for the different crystal values but as I remember they simply >swapped crystal values. I used a standard 3.2768 MHz crystal in my SPO256 device - no hassle getting one of those - might even get one from the dreaded Tandy/RatShack... enjoy.... -- --Yer give it a twist, an' a flick o' yer wrist, an yer fling it right over yer 'ed. Oi !-- ___________________________________________________________________________ ----Saddam Hussein - nuke him 'till he glows, then shoot him in the dark---