Sequencer Update

[jhaible]

Hi Chris,

> to a pair of CD4532B 8bit encoders,

Thank you, that's all I needed. Believe it or not, I didn't know (well,
I've never had a reason to ask, so far) waht these "priority encoder"
chips are good for. Now I know (;->).

Yes, it will be easy for me now, as I don't need more than 3 bits for
8 Steps. One single encoder chip.


> 	Have you planned out the Octave + Semitone quantizer yet?

Nothing more than a week ago. I've made a simulation with 2 cascaded
4017 chips, because PSpice aparently doesn't have a model for
the 4067. A few glitches, but it should work.

> Unfortunately, there doesn't seem to be anyplace online with the full
> catalog of 4000 series datasheets (someone please correct me if I'm
> wrong) . Harris requires faxing for those chips, and Fairchild doesn't
> have everything listed. I'm curious to hear about your part selection
> for this, as it's a cool idea.

I think I will use the 4067, plus a binary counter and some reset logic.

I'm on hollidays this week, and I have borrowed a CMOS data book from
work - this is very helpful.
If memory serves, I have downloaded some CMOS data sheets from 
Motorola, but I don't know if thes are complete.

Speaking of manufacturers, I just recognized that I have a lot of 
stupid HC chips in my drawers. I have ordered them as "4000 series
CMOS", and they are marked "HC40xx", with no "74" in front of the
"HC", and they showed strange behaviour on 15V (;->).
Hey, they *did* work, but when I pulled up an input with a 1meg
resistor, the input was clamped to some 6V ... Removed them all.
Strange that it even worked.

Built the core of the vertical count yesterday.
4516 counter, 4052 mux (one half for row selection, one
half for LEDs)

JH.