TTL SRAM interfacing

[Martin Czech]

> I have perhaps what is a somewhat unusual question.
> I would like to make a analog step sequencer with memory. 
> I just wonder if what I am about to try is possible, or if there is a
> better way. I would also like to do it without a micro.
> 
> 	In the Maplin (i think) and/or electronotes designs, they have a pulse
> sent to a binary up/down counter which is then fed into 2x8 line
> decoders..
> I would like to know if it is feasible to just feed the output of the
> binary counter into the address lines of SRAM, and, in turn, have the
> SRAM data out feed into a ADC.
> I decided that I only need perhaps 4-6 bits to represent 0 to 5v
> accurately, therefore, I would use the remaining MSBs to select the
> pattern. 
> 
> Whats cool if this works is that I could also get a bigger SRAM (say,
> oh, 16 bit or something) to be able to store other types of data per
> step, say, portmanto enable, extra gates, extra CVs, or have more
> pattern memory.
> 
> Let me all know what you think,I need help/reassurance! I havent worked
> much in design lately since my day job is all about finding new ways of
> destruction rather than construction! :))
> 

The second Formant book contains such an ADC/SRAM/DAC Sequenzer, i think.
Does it makes sense to start up such a project while having midi and
software sequencers ? I think you can do the most stuff with midi, exept
say very fast seqeunces near to audio rate, older records often have this
kind of effects, this is not possible with midi.

m.c.