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2004-08-07 by Paul Schreiber
Yet another SuperDigital WhizBang www.kontron.com look at the DIMM-PC/LITE, and entire 100Mhz, '486 computer the size of a business card. About $89ea in 100pcs. Paul S. going digital this weekend (just a silly phase, not to panic) :)
2004-08-07 by charlesosthelder
<sigh> I guess this is better than going postal. Still, I think to myself, "8 years of college for *this*?!" Chub - deeply analog --- In motm@yahoogroups.com, "Paul Schreiber" <synth1@a...> wrote: > Yet another SuperDigital WhizBang > > www.kontron.com > > look at the DIMM-PC/LITE, and entire 100Mhz, '486 computer the size of a
> business card. About $89ea in 100pcs. > > Paul S. > going digital this weekend (just a silly phase, not to panic) :)
2004-08-07 by Paul Schreiber
> <sigh> I guess this is better than going postal. Still, I think to > myself, "8 years of college for *this*?!" > > Chub - deeply analog > I suppose part of it is recalling I paid $6700 for a Zeos 386 case/motherboard, 1 floppy, a Video7 VGA card (first card that could really do 1024 x 768), a 120MB drive and a NEC monitor (the monitor alone was $1500). The Micronix motherboard was all *through-hole* 22V10 PALs. I counted like 140 of them (other motherboards used chip sets from Chips and Technologies). The motherboard alone (no processor) pulled 34A at +5V. I paid like $299 for a Cyrix 387 math co-processor and this was "a great deal". Ah, the good old days..... Paul S.
2004-08-07 by Bob Colwell
The Micronix motherboard was all *through-hole* 22V10 PALs. I counted like 140
of them (other motherboards used chip sets from Chips and Technologies). The
motherboard alone (no processor) pulled 34A at +5V. I paid like $299 for a Cyrix
387 math co-processor and this was "a great deal". Ah, the good old days.....
Paul S.
2004-08-07 by Paul Schreiber
74Fxxx logic *never* worked. I think many TTL design carrers were derailed by those awful things. The VC Pulse Divider will have 74ABT244 drivers on the outputs. Hardly any ground bounce at all (ground bounce causes severe under-shoot in TTL edges). Paul S. going digital this weekend
2004-08-07 by John Loffink
John Loffink The Microtonal Synthesis Web Site http://www.microtonal-synthesis.com The Wavemakers Synthesizer Web Site http://www.wavemakers-synth.com Off Topic, but 74FXXX did work. You just needed separate ground and power planes and serious decoupling, virtually requiring 4 layer boards which weren't all that common back then. ABT and other recent logic is much better today. Early Altera CPLDs were worse for ground bounce than F chips. On the early 600, 900 1200 series Altera was recommending gray code counters (only 1 bit transitions at a time) because their chips couldn't handle transition of an 8 bit counter from 11111111 to 00000000 without internal glitching. I found a similar problem on a 1990ish AMI/Gould PLD. Data glitch was pattern sensitive. I had to trace circuitry through half a dozen full height racks to solve that one. Switched to a similar Lattic part - problem solved. John Loffink The Microtonal Synthesis Web Site http://www.microtonal-synthesis.com The Wavemakers Synthesizer Web Site http://www.wavemakers-synth.com
> -----Original Message----- > From: Paul Schreiber [mailto:synth1@...] > Sent: Saturday, August 07, 2004 11:37 AM > To: motm@yahoogroups.com; Bob Colwell > Subject: Re: [motm] Re: YASDWB > > 74Fxxx logic *never* worked. I think many TTL design carrers were derailed > by > those awful things. > > The VC Pulse Divider will have 74ABT244 drivers on the outputs. Hardly any > ground bounce at all (ground bounce causes severe under-shoot in TTL > edges). > > Paul S. > going digital this weekend >
2004-08-07 by Mike Marsh
Uh, what CV Pulse Divider? --- In motm@yahoogroups.com, "Paul Schreiber" <synth1@a...> wrote: > 74Fxxx logic *never* worked. I think many TTL design carrers were derailed by > those awful things. > > The VC Pulse Divider will have 74ABT244 drivers on the outputs. Hardly any > ground bounce at all (ground bounce causes severe under-shoot in TTL edges).
> > Paul S. > going digital this weekend
2004-08-07 by Mike Marsh
Never mind, i reead the later posts which I should have done before posting this one... --- In motm@yahoogroups.com, "Mike Marsh" <michaelmarsh@s...> wrote:
> Uh, what CV Pulse Divider? > > --- In motm@yahoogroups.com, "Paul Schreiber" <synth1@a...> wrote: > > 74Fxxx logic *never* worked. I think many TTL design carrers were > derailed by > > those awful things. > > > > The VC Pulse Divider will have 74ABT244 drivers on the outputs. > Hardly any > > ground bounce at all (ground bounce causes severe under-shoot in > TTL edges). > > > > Paul S. > > going digital this weekend