Re: [AH] Ed-Lab Digital Lab: report # 1 <long>
2001-09-20 by Jim Johnson
Thanks for the tips, but this one's a little wonkier: it's configured, with
the help of a 7404, into a 4-bit shift register. In addition to the shift
outputs 3 - 0, there are four inputs(?) S0 - S3, a Data jack (SER), Shift
(CLK), and then.. Set, Clr, and N3. I think I see what all of them do
except for N3. It's an output of some sort, but I have not yet figured out
its pattern.
The MC845 is the one I'm most concerned about, as one of them is dead. It's
a JK flipflop with !R & !S jacks as well. I'm just using them as dividers
for the moment, but I'd like to play with them a bit more.
Jim Johnson
Metaphoric Software
-------------------
Makers of Techno Toys
Software for Electronic Music
http://www.technotoys.com
info@...
*********** REPLY SEPARATOR ***********
the help of a 7404, into a 4-bit shift register. In addition to the shift
outputs 3 - 0, there are four inputs(?) S0 - S3, a Data jack (SER), Shift
(CLK), and then.. Set, Clr, and N3. I think I see what all of them do
except for N3. It's an output of some sort, but I have not yet figured out
its pattern.
The MC845 is the one I'm most concerned about, as one of them is dead. It's
a JK flipflop with !R & !S jacks as well. I'm just using them as dividers
for the moment, but I'd like to play with them a bit more.
Jim Johnson
Metaphoric Software
-------------------
Makers of Techno Toys
Software for Electronic Music
http://www.technotoys.com
info@...
*********** REPLY SEPARATOR ***********
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On 9/20/01 at 4:39 PM David Evans wrote:
>On Thu, Sep 20, 2001 at 01:09:37PM -0700, Jim Johnson wrote:
>> Before I get into this, however, a plea: Can anyone point me to data
>sheets
>> for the following chips: MC845 (JK flip-flop), SN7480 (gated full
adder),
>> and SN7496 (shift register)?
>
> The SN7496 is in my TI TTL databook from 1988. Clear with CLR (pin 16,
>active low) while keeping PRE (pin 8) low. To load, apply the five values
>to A(2), B(3), C(4), D(6), and E(7) and bring PRE high. On the rising
edge
>of CLK(1) data will shift out of QE(10) with bit "E" appearing first. QE,
>QD(11), QC(13), QB(14), and QA(15) are the outputs from four R-S flip
>flops.
>
> To do serial to parallel it look as though you can provide the input at
>SER and, on the rising edge of CLK, it will be moved through the four
>flip flops, the first bit clocked showing up at QE.
>
> Help? :)
>
>--
>David Evans (NeXTMail/MIME OK)
>dfevans@...
>PhD Student, Computer/Synth Junkie
>http://bbcr.uwaterloo.ca/~dfevans/
>University of Waterloo "Default is the value selected by the
>composer
>Ontario, Canada overridden by your command." - Roland TR-707
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